Award type：Award from international society, conference, symposium, etc.  Country：Sweden

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Language：English   Publishing type：Research paper (scientific journal)  

Optimizing the homogeneity and efficiency of a solid oxide electrolysis cell based on multiphysics simulation and data-driven surrogate model

DOI： 10.1016/j.jpowsour.2023.232760

Language：English   Publishing type：Research paper (scientific journal)  

Herein an electro-chemo-mechanical theory, which states that mechanical work to deform a Cu current collector (CC) film influences the nucleation overpotential (η_nc) for Li nucleation at the Cu CC film/lithium phosphorus oxynitride (LiPON) electrolyte interface, is examined. The finite element method (FEM) simulated the mechanical pressure that the CC film exerted on the Li nuclei at the Cu/LiPON interface, and the results agreed with the trends in our previous study. In situ scanning electron microscopy (SEM) observations for cycling of Li plating/stripping showed that Li repeatedly nucleated and grew at positions where the CC film was locally fractured, and η_nc decreased with repeated Li plating/stripping because the mechanical pressure to the Li nuclei was no longer applied at locations where the CC film was fractured. On the other hand, for thicker CC films that did not crack, η_nc exhibited nearly consistent values in the Li plating/stripping cycles. Consequently, the experimental results in this study supported our nucleation theory for a metal/solid-state-electrolyte interfacial system.

DOI： 10.1149/1945-7111/aca79d

Language：English   Publishing type：Research paper (scientific journal)  

Three-Dimensional Numerical Modeling of a Low-Temperature Sabatier Reactor for a Tandem System of CO2 Methanation and Polymer Electrolyte Membrane Water Electrolysis

DOI： 10.5796/electrochemistry.22-00035

Language：English   Publishing type：Research paper (scientific journal)  

Water Transport Analysis in a Polymer Electrolyte Electrolysis Cell Comprised of Gas/Liquid Separating Interdigitated Flow Fields
PEM water electrolyzer, GDL, Hydrophobic MPL, Capillary pressure, Saturation, Microgravity, Manned space mission, Closed-loop air revitalization

DOI： 10.5796/electrochemistry.21-00097

Other Link： https://doi.org/10.5796/electrochemistry.21-00097

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/10301.0643ecst

Language：English   Publishing type：Research paper (international conference proceedings)  

Evaluation of Three-Dimensional Placement of Built-in Catalytic Partial Oxidation Catalyst in an Anode-Supported Honeycomb SOFC (Monolithic solid oxide fuel cell)
Keywords: Fuel and Heat Self-Sustaining Fuel Cell, Portable Power Source, Small Power Source, Disaster, Methane, Butane, Propane, Gas cartridge, Gas Canister

DOI： 10.1149/10301.1991ecst

Other Link： http://dx.doi.org/10.1149/10301.1991ecst

Language：Others   Publishing type：Research paper (scientific journal)  

Mitsuhiro Inoue, Motohiko Sato, Asuka Shima, Hironori Nakajima, Yoshitsugu Sone, Takayuki Abe, Practical Application Study of Highly Active CO2 Methanation Catalysts Prepared Using the Polygonal Barrel-Sputtering Method: Immobilization of Catalyst Particles

DOI： 10.1007/s10562-021-03623-7

Other Link： https://doi.org/10.1007/s10562-021-03623-7

Language：English   Publishing type：Research paper (scientific journal)  

© The Author(s) 2020. Water electrolysis cell in which the product gases was separated from liquid water on the surface of the electrode was developed. In order to realize the separation between gas and water, interdigitated diffusion layer (GDL) was designed, and the surface of the GDL was covered by catalyst to form electrode. When the pressurized water was supplied, the water directly made a contact to the proton conductive membrane. Due to the hydrophobic surface condition of the GDLs, gas/water separation along the surface of the electrode was completed.

DOI： 10.5796/electrochemistry.20-00145

Language：English   Publishing type：Research paper (other academic)  

For solid oxide fuel cells (SOFCs), durability to carbon deposition is a common problem to use hydrocarbon fuels from the city gas and the biogas. Identification of degradation factors and locations leads to development of diagnosis method and optimized operation control for prevention of failure and accident. Electrochemical data by the degradation give useful parameters for health diagnosis. In this study, we are aiming to understand spatial degradation, so that we prepared an anode-supported planar cell in which the cathode layer was segmented to three parts. We fed dry methane gas to the anode as accelerated aging tests and measured the current distribution directly among the upstream, midstream and downstream parts along the anode flow channels. Electrochemical impedance spectroscopy analysis was carried out in each segment as well. Upstream part of the cell exhibited larger overpotentials with more enhanced carbon deposition than the other parts with the dry methane fuel.

DOI： 10.1149/09101.0549ecst

Other Link： https://doi.org/10.1149/09101.0549ecst

Language：Japanese   Publishing type：Research paper (scientific journal)  

Impedance Diagnosis of Abnormal Operational Conditions to Enhance Reliability of Marine Fuel Cells

DOI： 10.5988/jime.54.287

Other Link： https://doi.org/10.5988/jime.54.287

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijhydene.2018.07.030

Other Link： https://doi.org/10.1016/j.ijhydene.2018.07.030

Language：English   Publishing type：Research paper (international conference proceedings)  

The application of polymer electrolyte fuel cells (PEFCs) for marine vessels will be an effective means of reducing the environmental impact and solving energy crisis problems. The diagnosis of abnormal operational conditions is an important aspect of improving the reliability and durability of marine PEFCs, and helps to ensure long-term safe and stable operation. The present work investigates the effect of abnormal variations in the relative humidity of supplied gases on the resistance values in the equivalent circuit model using electrochemical impedance spectroscopy analysis. An appropriate microporous layer coated gas diffusion layer is evaluated to enhance the cell performance under both low and high humidity conditions. The effect of sea salt (NaCI) contamination in the cathode air on the cell performance is also evaluated. Injecting distilled water after the initial detection of performance degradation due to NaCI contamination is effective at recovering the cell performance.

DOI： 10.1149/08613.0271ecst

Other Link： https://doi.org/10.1149/08613.0271ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.0871805jes

Other Link： https://doi.org/10.1149/2.0871805jes

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00231-017-2215-0

Other Link： http://dx.doi.org/10.1007/s00231-017-2215-0

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s00231-017-2154-9

Other Link： http://dx.doi.org/10.1007/s00231-017-2154-9

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/07801.2203ecst

Other Link： http://dx.doi.org/10.1149/07801.2203ecst

Language：English   Publishing type：Research paper (international conference proceedings)  

Impedance Spectra Associated with Metal Deposition at the Negative Electrode from Contaminating Metal Particles at the Positive Electrode in a Lithium Ion Battery
Metal, Ni, Cu, Fe, Stainless steel, Deposition, Dendrite, Short-circuiting, SEI layer, Thermal runaway, Electrochemical Impedance Spectroscopy, Fast Fourier transform, FFT, Safety

DOI： 10.1149/07523.0027ecst

Other Link： http://dx.doi.org/10.1149/07523.0027ecst

Language：English   Publishing type：Research paper (scientific journal)  

Hydrogen Production with CuO/ZnO Nanowire Catalyst for a Nanocatalytic Solar Thermal Steam-Methanol Reformer - Thermal / Photothermal catalyst
Thermal / Photothermal catalyst, steam reforming, hydrogen

DOI： 10.1016/j.ijhydene.2016.07.039

Other Link： http://dx.doi.org/10.1016/j.ijhydene.2016.07.039

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijhydene.2016.06.194

Other Link： http://dx.doi.org/10.1016/j.ijhydene.2016.06.194

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.0701603jes

Other Link： http://dx.doi.org/10.1149/2.0701603jes

Language：English   Publishing type：Research paper (international conference proceedings)  

Diagnosis Method to Detect the Incorporation of Metallic Particles in a Lithium Ion Battery
Nickel, Copper, Iron, Stainless steel, Deposition, Dendrite, Short-circuiting, Thermal runaway, Electrochemical impedance spectroscopy, Cyclic voltammetry, Safety

DOI： 10.1149/06802.0059ecst

Other Link： http://dx.doi.org/10.1149/06802.0059ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/acs.chemmater.5b01568

Other Link： http://dx.doi.org/10.1021/acs.chemmater.5b01568

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2015.06.024

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2015.06.024

Language：English   Publishing type：Research paper (international conference proceedings)  

Effect of Electrode Mixing Conditions on the Performance of Lithium-Ion Batteries Analyzed by Fast Fourier Transform Electrochemical Impedance Spectroscopy
Composite electrode, Slurry, Conductive materials, Acetylene black, Dispersion, Network, Internal resistance, Electrochemical impedance spectroscopy, Fast Fourier transform, FFT

DOI： 10.1149/06422.0087ecst

Other Link： http://dx.doi.org/10.1149/06422.0087ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2014.12.156

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2014.12.156

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijheatmasstransfer.2014.06.033

Other Link： http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.06.033

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1.3486805

Other Link： http://dx.doi.org/10.1149/1.3486805

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2009.10.089

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2009.10.089

Language：English   Publishing type：Research paper (other academic)  

Electrochemical Peltier heat, Single electrode, Transported entropy, Irreversible thermodynamics, Non-equilibrium thermodynamics, Overpotential, Integration, Impedance, Endothermic

DOI： 10.1149/1.3205544

Other Link： http://dx.doi.org/10.1149/1.3205544

Language：Others   Publishing type：Research paper (scientific journal)  

Analysis of Electric Generation Distribution on a PEFC Electrode : 3rd Report, Electric Generation Distribution in a PEFC Analyzed by Partial Electrode Method, Toshiaki KONOMI, Tatsumi KITAHARA, Hironori NAKAJIMA, Yuya TANAKA, 2009, Volume 75, Issue 749, Pages 164-169. Keywords: PEMFC, Local current density, In-situ, Current distribution, Rib, Land, Channel, CCM, MEA partially coated with catalyst layer, Partially-catalyzed membrane

DOI： 10.1299/kikaib.75.749_164

Other Link： https://doi.org/10.1299/kikaib.75.749_164

Language：English   Publishing type：Research paper (scientific journal)  

Electrochemical Impedance Parameters for the Diagnosis of a Polymer Electrolyte Fuel Cell Poisoned by Carbon Monoxide in Reformed Hydrogen Fuel
We have investigated the behavior of an operating polymer electrolyte fuel cell (PEFC) with supplying a mixture of carbon monoxide (CO) and hydrogen (H2) gases into the anode to develop the PEFC diagnosis method for anode CO poisoning by reformed hydrogen fuel. We analyze the characteristics of the CO poisoned anode of the PEFC at 80°C including CO adsorption and electro-oxidation behaviors by current-voltage (I-V) measurement and electrochemical impedance spectroscopy (EIS) to find parameters useful for the diagnosis. I-V curves show the dependence of the output voltage on the CO adsorption and electro-oxidation. EIS analyses are performed with an equivalent circuit model consisting of several resistances and capacitances attributed to the activation, diffusion, and adsorption/desorption processes. As the result, those resistances and capacitances are shown to change with current density and anode overpotential depending on the CO adsorption and electro-oxidation. The characteristic changes of those parameters show that they can be used for the diagnosis of the CO poisoning.

DOI： 10.1115/1.2931462

Other Link： http://dx.doi.org/10.1115/1.2931462

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.electacta.2007.04.082

Other Link： http://dx.doi.org/10.1016/j.electacta.2007.04.082

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.electacta.2007.01.032

Other Link： http://dx.doi.org/10.1016/j.electacta.2007.01.032

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2007.06.004

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2007.06.004

Language：Others   Publishing type：Research paper (scientific journal)  

Toshiaki KONOMI, Tatsumi KITAHARA, Hironori NAKAJIMA, and Hiroki MURAKAMI, Analysis of Electric Generation Distribution on PEFC Electrode (1st Report, Electric Generation Distribution under Rib and Gas Channel), Transactions of the Japan Society of Mechanical Engineers, Series B, Vol.73, No.726 (2007-2), p.631-637. Keywords: PEMFC, Local current density, In-situ, Rib, Land, Channel, partial gas diffusion layer (GDL), Microporous layer (MPL)

DOI： 10.1299/kikaib.73.631

Other Link： https://doi.org/10.1299/kikaib.73.631

Language：English   Publishing type：Research paper (scientific journal)  

The Surface Adsorption of Hydride Ions and Hydrogen Atoms on Zn Studied by Electrochemical Impedance Spectroscopy with a Non-Equilibrium Thermodynamic Formulation

DOI： 10.1515/JNETDY.2006.011

Other Link： https://www.researchgate.net/publication/243582305_The_Surface_Adsorption_of_Hydride_Ions_and_Hydrogen_Atoms_on_Zn_Studied_by_Electrochemical_Impedance_Spectroscopy_with_a_Non-Equilibrium_Thermodynamic_Formulation

Language：Others   Publishing type：Research paper (scientific journal)  

Electrodeposition of metallic molybdenum films in ZnCl2–NaCl–KCl–MoCl3 systems at 250°C

DOI： 10.1016/j.electacta.2005.10.041

Other Link： http://dx.doi.org/10.1016/j.electacta.2005.10.041

Language：English   Publishing type：Research paper (scientific journal)  

Lithium Bromide, Eutectic melt, Nitride ion, Nitride formation, Ammonia production

DOI： 10.1021/jp053920i

Other Link： http://dx.doi.org/10.1021/jp053920i

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

Dissolution of Hydrogen in Molten LiCl-KCl

DOI： 10.5796/electrochemistry.73.733

Language：English   Publishing type：Research paper (scientific journal)  

Electrodeposition of Metallic Tungsten in ZnCl2-NaCl-KCl-WCl4 Melt at 250゜C

Other Link： http://dx.doi.org/10.1149/1.1921130

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/jp044477z

Other Link： http://dx.doi.org/10.1021/jp044477z

Language：English   Publishing type：Research paper (scientific journal)  

Thermodynamic Investigations of Nitrogen Electrode Reaction in a Molten LiCl-KCl-CsCl-Li3N System

Other Link： http://dx.doi.org/10.1149/1.1922891

Language：English   Publishing type：Research paper (scientific journal)  

The single electrode Peltier heats of Li+/Li, H2/H− and Li+/Pd–Li couples in molten LiCl–KCl systems
Molten chloride, Eutectic melt, Regenerative fuel cell, Silane production, Isotope separation, Molten salt reactor, Thorium cycle, MSBR, Irreversible thermodynamics, Non-equilibrium thermodynamics, Hydride ion, Ionic liquid

DOI： 10.1016/j.electacta.2004.06.014

Other Link： http://dx.doi.org/10.1016/j.electacta.2004.06.014

Language：English   Publishing type：Research paper (scientific journal)  

Infrared Spectroscopy of Molten LiCl-KCl-LiH

Other Link： http://dx.doi.org/10.1149/1.1664052

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1021/jp049490y

Other Link： http://dx.doi.org/10.1021/jp049490y

Language：English   Publishing type：Research paper (scientific journal)  

Thermodynamic Investigations of Hydrogen Electrode Reaction in a Molten LiCl-KCl-LiH System, Hironori NAKAJIMA, Toshiyuki Nohira, Yasuhiko Ito
Keywords: Molten chloride, Eutectic melt, Regenerative fuel cell, Silane production, SiH4, Isotope separation, Molten salt reactor, Thorium cycle, MSBR, Standard state, Standard potential, Activity coefficient, Hydride ion, Ionic liquid

DOI： 10.1149/1.1462876

Other Link： http://dx.doi.org/10.1149/1.1462876

Language：English   Publishing type：Research paper (scientific journal)   Publisher：International Journal of Hydrogen Energy  

In water electrolysis experiments on hydrogen production, boiling effectively decreases the overpotential of the oxygen evolution reaction (OER) [Li et al. Int. J. Hydrog. Energy. 2022, 47(61):25499–510]. This study constructed a theoretical model to quantitatively explore the mechanism by which boiling reduces the OER overpotential. The model considers dissolved oxygen, liquid water, gaseous oxygen, and water vapor flowing through the porous transfer layer (PTL). The results showed that boiling increases the molar flux of gaseous oxygen and reduces the dissolved oxygen concentration. The PTL embedded in the catalyst layer (CL) increased the mass transfer resistance of dissolved oxygen and increased the dissolved oxygen concentration in the CL. Once boiling is superimposed on the OER, it attracts more dissolved oxygen to the water vapor bubbles and significantly decreases the dissolved oxygen concentration at the CL, thereby reducing the Nernst loss of the OER.

DOI： 10.1016/j.ijhydene.2023.08.193

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Journal of the Electrochemical Society  

A novel microporous layer (MPL) coated gas diffusion layer (GDL) is developed to improve water management of polymer electrolyte fuel cells (PEFCs) by incorporating hydrophobic and hydrophilic pores within the same layer. This MPL expels excess water at the interface between the catalyst layer and MPL through hydrophilic pores while maintaining efficient oxygen transport through hydrophobic pores, reducing oxygen transport resistance under high humidity conditions. The water permeability and relative oxygen permeance tests demonstrate the presence of separate hydrophobic and hydrophilic pores in the appropriate composite MPL. The effects of combinations of hydrophilic and hydrophobic binders used in the composite MPLs on the oxygen transport resistance are evaluated. The hydrophobic polytetrafluoroethylene (PTFE) binder and the hydrophilic polyvinyl alcohol (PVA) binder cannot enhance performance due to mismatched sintering temperatures. Although the hydrophobic polyvinylidene fluoride (PVDF) and PVA binders have the same sintering temperature, the performance was degraded due to the strong hydrophilicity of PVA. Another combination of composite MPL incorporates hydrophobic PVDF and Nafion binders. Hydrophilic TiO2 particles are introduced in the Nafion binder to reinforce the hydrophilicity. The appropriate composite MPL significantly reduced the total oxygen transport resistance compared to those obtained with the hydrophobic MPL.

DOI： 10.1149/1945-7111/ad170d

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

The polymer electrolyte membrane water electrolysis (PEMWE) performance is closely related to the Nafion^® ionomer content in catalyst layers (CLs). This study experimentally investigates the impact of anode and cathode Nafion^® ionomer contents on the PEMWE performance at high temperatures. The Nafion^® ionomer content is 5–30 wt% on both anode and cathode sides, while the temperature and operating pressure change from 80°C to 120°C and 0.1 MPa to 0.3 MPa, respectively. Experimental results reveal that elevated temperature and operating pressure can remarkably promote the performance of PEMWE with a reasonable Nafion^® ionomer content and without dehydrating the membrane at 120°C and 0.3 MPa. However, the PEMWE performance deteriorates as the Nafion^® ionomer content is too low. The anode Nafion^® ionomer content has a relatively great impact on ohmic resistance, concentration, and activation overpotential, especially the concentration overpotential. Nevertheless, the cathode Nafion^® ionomer content only affects the ohmic resistance. Finally, under the operating conditions of 120°C and 0.3 MPa, employing a Nafion ionomer content of 10 wt% in the anode–cathode sides minimizes the electrolysis voltage to 2.18 V at 18 A/cm².

DOI： 10.3389/fenrg.2023.1313451

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/1945-7111/ad13da

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijheatmasstransfer.2023.124420

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2023.233143

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2022.232098

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2022.231803

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/10909.0085ecst

Language：Others   Publishing type：Research paper (scientific journal)  

Liquid water accumulated in the catalyst layer (CL) and gas diffusion layer (GDL) of a polymer electrolyte fuel cell (PEFC, PEMFC) results in performance deterioration due to the inhibition of oxygen transport to the cathode CL (Flooding). To enhance the drainage in the GDL, a microporous layer (MPL) employed at the CL side of the GDL substrate is effective. Hydrophilic/hydrophobic composite MPLs in-house applied have mitigated the flooding, while the mechanism was not well clarified. A pore network model (PNM) of our in-house hydrophobic MPLs is modified for the analysis of the composite MPL.

DOI： 10.1149/10408.0157ecst

Language：Others   Publishing type：Research paper (scientific journal)  

The hydrophobic microporous layer (MPL) coated on the gas diffusion layers (GDLs) have been commonly used to improve water management properties of polymer electrolyte fuel cells (PEFCs). An MPL coated GDL designed to prevent dehydration of the membrane electrode assembly (MEA) under low humidity conditions is generally inferior at reducing flooding under high humidity conditions. Thus, developing an MPL coated GDL to enhance the PEFC performance under low and high humidity conditions is crucial. One method to overcome the defects of pure hydrophobic MPL is to make double and triple MPLs, in which a thin hydrophilic layer coated on the hydrophobic MPL. Another method is a hydrophobic MPL containing hydrophilic carbon nanotubes (CNTs). Both methods effectively conserve membrane humidity and reduce flooding under high humidity conditions.

DOI： 10.1149/10408.0117ecst

Language：Others   Publishing type：Research paper (other academic)  

Open PNM, Leverett function, Wetting liquid saturation, Concentration boundary layer, Relative permeability, FIB-SEM, Watershed

DOI： 10.1149/10408.0129ecst

Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

Thermally Self-sustaining CO2 Methanation Reaction on Ru/TiO2 Catalysts Prepared by the Polygonal Barrel-Sputtering Method

Language：English   Publishing type：Research paper (scientific journal)  

This study evaluated the mechanical reliability of glass seal in planar type solid oxide fuel cells and clarified the relationship between glass wettability and the mechanical reliability of glass seal. A visualization experiment was developed to observe a specific model seal in a furnace subjected to temperature variation and the relationship between the glass wettability and the seal shape was measured. The seal model consists of glass (G018-311, Schott, Germany) and interconnectors (Crofer 22 APU, VDM Metals GmbH, Germany). The visualization experiment and analysis were based on the sessile drop method to quantify glass surface tension and contact angle between glass and interconnector. The equation balance of forces with these surface properties succeeded to reproduce the seal shape observed in the visualization. Subsequently, the seal stress field was numerically solved, and the mechanical strength of the seal was quantitatively evaluated using the stress intensity factor. The analyses concluded that the stress intensity factor is 1.5 times higher than its minimum value as the contact angle raised from 90 to 130° and glass wettability decreased.

DOI： 10.1016/j.ijhydene.2020.05.153

Language：English   Publishing type：Research paper (scientific journal)  

Polymer electrolyte fuel cells (PEFCs) have attracted attention for marine vessels because of their potential to reduce pollutant emissions on the ocean. Electrochemical impedance spectroscopy (EIS) is suitable for real-time diagnosis for marine PEFCs. In this study, EIS is used to assess the impact of sea salt (NaCl) contamination in the cathode through the fast Fourier transform technique combined with a transmission line model including proton conduction in the ionomer/electrolyte membrane and the charge/mass transfer resistances with associated capacitances as diagnostic parameters. Variations in those resistances from the polarization losses in accelerated degradation tests with NaCl injection are revealed together with the capacitances. Five hours’ injection led to ca. 2.5 times larger mass transfer resistance possibly due to lowered hydrophobicity of the gas diffusion layer. Distilled water humidification after detecting the NaCl contamination at an early stage mitigates irreversible catalyst degradation indicated by transmission electron microscope observations

DOI： 10.1149/09208.0341ecst

Other Link： https://doi.org/10.1149/09208.0341ecst

Language：English   Publishing type：Research paper (scientific journal)  

Fuel production by a cathode-supported honeycomb solid oxide electrolysis cell (Monolithic SOEC)
In recent years, the establishment of Power to Gas technology is in progress. Promising methods include steam electrolysis and co-electrolysis using the Solid Oxide Electrolysis Cell (SOEC). We have developed a honeycomb electrolytic cell with a larger reactive area per unit volume than the conventional flat and tubular types. Thereby volumetric density of fuel production rate can be greatly improved, leading to a development of compact and high performance steam electrolysis systems. In this study, we address hydrogen production by steam electrolysis with an SOEC having a porous honeycomb support consisting of Ni-YSZ cathode. Current-voltage curves were measured with sampling the cathode outlet gas for gas chromatography. As the results, we confirmed that hydrogen concentration in the outlet increased as the current increased. The experimental results are useful to validate numerical models to design practical honeycomb cells.

DOI： 10.1149/09101.2707ecst

Other Link： https://doi.org/10.1149/09101.2707ecst

Language：English   Publishing type：Research paper (scientific journal)  

The overpotentials generated in an electrochemical hydrogen pump (EHP) are experimentally separated using a hydrogen reference electrode. An intentionally thick polymer electrolyte membrane and a low-Pt-catalyst-loaded layer are embedded in the EHP cell for high accuracy in separation. The results show that the non-ohmic overpotential of the cathode is larger than that of the anode. Electrochemical impedance spectroscopy (EIS) is employed to analyze the non-ohmic overpotential in detail, and different features are observed in the Nyquist plots for the anode and the cathode, where the cathode spectra exhibits charge transfer rate-limiting features and the anode spectra displays mass transfer rate-limiting features. These different characteristics are theoretically clarified by the classical Volmer–Heyrovsky–Tafel mechanism. The hydrogen evolution reaction (HER) in the cathode is dominated by the Volmer–Heyrovsky route, and the hydrogen oxidation reaction (HOR) in the anode is dominated by the Volmer–Tafel route. Due to the slow reaction rate imposed by the Volmer–Heyrovsky route, the cathode HER displays high non-ohmic overpotential. With increasing cathode pressure, the rate of HER is increased due to the increasing coverage of the hydrogen adsorbed on the surface of the catalyst.

DOI： 10.1016/j.electacta.2019.01.108

Language：English   Publishing type：Research paper (scientific journal)  

The numerical analysis conducted in this study proposes a guideline to maximize the higherature effect, which is expected to reduce the electrolysis voltage of the polymer electrolyte membrane water electrolyzer. Higherature operation is intuitively thought to reduce activation overvoltages. However, a further consideration predicts that high temperature, especially a temperature higher than the saturated temperature regulated in the operation pressure, decreases the liquid saturation and causes shortage of water, leading to a large increase in overvoltages. This high temperature problem is analyzed using the developed theoretical model, which considers gas/liquid behavior. The analysis suggests that, if the gas saturation in the anode catalyst layer is kept at or below 0.3 by increasing the pressure, liquid water in the catalyst layer is sufficient to OER catalytic ability regulated by exchange current density, demonstrating that the higherature effect works. According to this guideline, increasing the temperature with pressurization can monotonically reduce the anode activation overvoltage. For instance, raising the temperature from 100 to 120°C and raising the pressure from 0.13 to 0.22 MPa can prevent the gas saturation from increasing beyond 0.3 and allows the lower electrolysis voltage to vary from 1.57 to 1.51 V.

DOI： 10.1149/2.0521904jes

Language：English  

DOI： 10.5988/jime.53.417

Other Link： https://doi.org/10.5988/jime.53.417

Language：English   Publishing type：Research paper (scientific journal)  

This study aimed to optimize the flow-field pattern and flow configuration of a polymer-electrolyte-membrane water electrolyzer, with a particular focus on high-temperature operation up to 120 °C. Three types of flow-field pattern (serpentine, parallel, and cascade) were tested in both the anode and cathode sides of a water electrolyzer cell, and the current-voltage characteristics and high-frequency resistance were measured to examine which overpotential components are impacted by the flow-field pattern. The experimental results revealed that the cathode flow-field pattern only affects the ohmic overpotential, while the anode flow-field pattern significantly affects the overpotential related to liquid water shortage at catalyst layer, and the flow configuration (counter- and co-flow) does not affect the electrolysis performance. Finally, under operating conditions of 120 °C and 0.3 MPa, we found that the optimized cell configuration consisted of cascade and serpentine flow-field patterns in the anode and cathode, respectively; this configuration produced the minimum electrolysis voltage of 1.69 V at 2 A/cm².

DOI： 10.1016/j.ijhydene.2018.02.171

Language：Japanese  

DOI： 10.1299/transjsme.17-00419

Other Link： http://dx.doi.org/10.1299/transjsme.17-00419

Language：Others   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/08008.1117ecst

Language：English   Publishing type：Research paper (international conference proceedings)  

Secure sealing is vital for planar type SOFCs to avoid the performance degradation and achieve long-term stable operation. Here we focus on the sheet type glass sealing which is produced by tape-casting method. High wettability of the glass is essential to avoid the stress concentration because low wettability increases the contact angle of the glass and makes the notch at the edge of glass sealing interface. We have evaluated the effect of temperature rising rate on the wettability of the sealing glass and the edge shape of it using the visualization test system. High temperature rising rate led to small contact angle of the sealing glass in some cases and can mitigate the stress concentration.

DOI： 10.1149/07801.1731ecst

Other Link： http://dx.doi.org/10.1149/07801.1731ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/07801.2109ecst

Other Link： http://dx.doi.org/10.1149/07801.2109ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/07801.2191ecst

Other Link： http://dx.doi.org/10.1149/07801.2191ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/07514.1107ecst

Other Link： http://dx.doi.org/10.1149/07514.1107ecst

Language：English   Publishing type：Research paper (other academic)  

This study challenges to decrease water electrolysis voltage by thermodynamic coupling between boiling and water electrolysis. Boiling, once a system to cause boiling is given, spontaneously advances and causes entropy generation. When boiling is superimposed on an electrode where electrochemical reaction of water electrolysis progress, the entropy generation by the boiling possibly accelerates the reaction of water electrolysis, leading to reduction of electrolysis voltage. To confirm this new concept, electrolysis voltage for a unit cell of PEMWE is measured in the region from 80°C to 120°C under a condition that cell pressure and electrolysis current are kept constant. The measurement results showed that the electrolysis voltage abruptly decrease as cell temperature crosses boiling point and then turn to increase at a few degree higher than the point. These features in the measurement were reproduced in the theoretical analysis based on a mathematical model considering the thermodynamic coupling.

DOI： 10.1149/08008.1117ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/07552.0091ecst

Other Link： http://dx.doi.org/10.1149/07552.0091ecst

Language：English  

DOI： 10.1149/07514.1155ecst

Other Link： http://dx.doi.org/10.1149/07514.1155ecst

Language：English  

DOI： 10.1149/07514.1095ecst

Other Link： http://dx.doi.org/10.1149/07514.1095ecst

Language：English  

DOI： 10.1088/1742-6596/745/3/032082

Other Link： https://doi.org/10.1088/1742-6596/745/3/032082

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1149/2.0251613jes

Other Link： http://dx.doi.org/10.1149/2.0251613jes

Language：English  

DOI： 10.1088/1742-6596/745/3/032149

Other Link： https://doi.org/10.1088/1742-6596/745/3/032149

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2016.09.086

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2016.09.086

Language：English  

DOI： 10.1149/07514.0209ecst

Other Link： http://dx.doi.org/110.1149/07514.0209ecst

Language：English  

Electrochemical hydrogen pump (EHP) with an internal humidifier is reported. The internal humidifier contains liquid water stored in a vessel built in the cathode end plate, and the water directly wets a polymer electrolyte membrane (PEM). By using the internal humidifier, conductivity of the PEM is higher than that using a conventional vapor humidifier. A modeling of water transport is built to discuss the water balance in the membrane. Electrochemical impedance spectroscopy (EIS) is employed for analyzing the resistance components included in the EHP. In particular, the effects of compression ratio on resistance components are investigated.

DOI： 10.1016/j.ijhydene.2016.05.160

Other Link： https://doi.org/10.1016/j.ijhydene.2016.05.160

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijhydene.2016.05.160

Other Link： http://dx.doi.org/10.1016/j.ijhydene.2016.05.160

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijhydene.2016.04.117

Other Link： http://dx.doi.org/10.1016/j.ijhydene.2016.04.117

Language：English  

DOI： 10.1016/j.jpowsour.2016.03.108

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2016.03.108

Language：English  

DOI： 10.1149/06918.0003ecst

Other Link： http://dx.doi.org/10.1149/06918.0003ecst

Language：English  

DOI： 10.1016/j.jpowsour.2015.12.020

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2015.12.020

Language：English  

DOI： 10.1149/06801.2141ecst

Other Link： http://dx.doi.org/10.1149/06801.2141ecst

Language：English  

DOI： 10.1149/06801.2217ecst

Other Link： http://dx.doi.org/10.1149/06801.2217ecst

Language：English  

DOI： 10.1149/06445.0135ecst

Other Link： http://dx.doi.org/10.1149/06445.0135ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijhydene.2015.03.045

Other Link： http://dx.doi.org/10.1016/j.ijhydene.2015.03.045

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2015.02.115

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2015.02.115

Language：Japanese  

Water vapor exchange system installed in a polymer electrolyte fuel cell to enhance the performance without humidification
Polymer electrolyte fuel cells (PEFCs) generally have external humidifiers to supply humidified hydrogen and oxidant gases, preventing dehydration of the membrane electrode assembly (MEA). If a PEFC could be operated without humidification, external humidifiers may be removed, resulting in a very simplified PEFC system with increased total efficiency and reduced cost. One of most important issues to advance the commercial viability of PEFCs is to develop high performance PEFCs that can operate without humidification. In the present study, a water vapor exchange system installed in the cell was developed to enhance the PEFC performance without humidification. A gas diffusion layer coated with a hydrophilic microporous layer, which consists of carbon black and polyvinyl alcohol (PVA), used at the cathode exchange area increases water transport from the wet cathode outlet gas to the dry anode inlet gas. This prevents dehydration of the MEA, thereby reducing the IR (ohmic) overpotential. The exchange area using interdigitated flow channels is effective to achieve further enhancement of water transport from the cathode to the anode, which significantly enhances the ability to prevent dehydration of the MEA. This results in a much higher output power density compared with that for a PEFC without the water vapor exchange area.

DOI： 10.1299/transjsme.2014tep0363

Other Link： http://doi.org/10.1299/transjsme.2014tep0363

Language：Japanese  

Analysis of water behavior in PEFC through 3D thermal and temperature distribution measurement by ultrafine thermocouples
Local water behaviors in a PEFC was analyzed by equivalent electric circuit and the temperature distribution with an ultra-fine thermocouples. The thermocouple is tailor-made: thermocouple elements in 50 μm diameter are welded, and electrically insulated with polyimide coating, resulting in the ultra-fine thermocouple. The temperature distribution, which was measured by the thermocouple placed in array configuration, reveals that the cathode catalyst layer shows the highest temperature in the through-plane direction due to the activation over-potential in cathode. Under low humidification condition, however, the anode catalyst layer has the highest temperature triggered by dried polymer electrolyte membrane and increased IR loss. Along gas flow direction, upstream has the highest temperature, because water droplets accumulate in downstream resulting that load current and heat production concentrates in the upstream. In comparison of the temperature in the adjacent channels direction, the tendency of liquid water accumulation under rib makes the temperature under the channel higher.

DOI： 10.1299/transjsme.2014tep0364

Other Link： http://doi.org/10.1299/transjsme.2014tep0364

Language：English  

DOI： 10.1149/06403.0477ecst

Other Link： http://dx.doi.org/10.1149/06403.0477ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.4028/www.scientific.net/MSF.783-786.1698

Other Link： http://dx.doi.org/10.4028/www.scientific.net/MSF.783-786.1698

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2013.10.009

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2013.10.066

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2013.10.009

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2013.10.009

Language：Japanese  

Development of a PEFC with Serpentine Hybrid Pattern Gas Channels (5th Report, Electrochemical Impedance Spectroscopy Analysis of the Internal Resistances)
The development of a polymer electrolyte fuel cell (PEFC) without external humidification is one of the most important issues to increase total efficiency and reduce cost. We have so far developed hybrid pattern gas flow channels consisting of interdigitated and serpentine gas flow channels for PEFCs without external humidification. The PEFC performance was improved when using the serpentine hybrid flow channels compared with the conventional flow channels. For further study, we have analyzed resistances of the cells with electrochemical impedance spectroscopy in the present study. The proton transfer resistance through the ionomer at the catalyst layer is dominant and its value for the hybrid flow channel is less than half that for the serpentine flow channel. The smaller resistance is possibly ascribed to the interdigitated design that can uniformly distributed reactant gas to each flow channel. The oxygen partial pressure is thereby relatively uniform at the active area. Thus, the interdigitated design can provide uniform current and water distribution. In addition, the hybrid flow channel has a low-pressure serpentine flow channel that helps the catalyst layer to hydrate. Un-reacted gas that contains modest water vapor flows through the channel and supplies water to the catalyst layer.

DOI： 10.1299/kikaib.79.2774

Other Link： http://dx.doi.org/10.1299/kikaib.79.2774

Language：English  

DOI： 10.1149/05801.1799ecst

Other Link： http://dx.doi.org/10.1149/05801.1799ecst

Language：English  

DOI： 10.1149/05701.2997ecst

Other Link： http://dx.doi.org/10.1149/05701.2997ecst

Language：English  

DOI： 10.1149/05701.0727ecst

Other Link： http://dx.doi.org/10.1149/05701.0727ecst

Language：English  

DOI： 10.1149/05701.0815ecst

Other Link： http://dx.doi.org/10.1149/05701.0815ecst

Language：English  

DOI： 10.1149/05801.0681ecst

Other Link： http://dx.doi.org/10.1149/05801.0681ecst

Language：English  

DOI： 10.1149/05801.1401ecst

Other Link： http://dx.doi.org/10.1149/05801.1401ecst

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.ijhydene.2013.06.046

Other Link： http://dx.doi.org/10.1016/j.ijhydene.2013.06.046

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.jpowsour.2013.01.150

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2013.01.150

Language：English  

An anode-supported honeycomb SOFC that can achieve high power density and enhanced durability was developed. Electrolyte layer of 8YSZ (8 mol% yittria stabilized zirconia) is employed by dip-coating an anode honeycomb substrate of Ni/YSZ, followed by being coated with cathode layer of La0.7Sr0.3MnO3. Current-voltage and current-power density characteristics of the cells having different anode and cathode flow channel configurations at 850℃ were measured. The results show promising performances of the cell as a starting point to develop stacks composed of multiple honeycomb cells.

DOI： 10.1149/05048.0071ecst

Other Link： http://dx.doi.org/10.1149/05048.0071ecst

Language：English  

Language：English  

Other Link： http://dx.doi.org/10.1149/05002.0291ecst

Language：Japanese  

Hydrophilic and Hydrophobic Double MPL Coated Gas Diffusion Layer to Prevent Drying-Up and Flooding of Polymer Electrolyte Fuel Cells
Gas diffusion layers (GDLs) coated with a hydrophobic microporous layer (MPL) have been commonly used to improve water management properties of polymer electrolyte fuel cells (PEFCs). In the present study, a novel hydrophilic and hydrophobic double MPL coated GDL was developed to achieve further enhancement of the PEFC performance under both low and high humidity conditions. Under low humidity conditions, a thin hydrophilic layer using titanium dioxide coated on the hydrophobic MPL is effective to conserve the humidity of the membrane electrode assembly (MEA), while a hydrophobic intermediate MPL between the hydrophilic layer and the carbon paper substrate prevents removal of water in the hydrophilic layer. This results in a significant enhancement of the ability of the MPL to prevent drying-up of the MEA. Under high humidity conditions, the double MPL coated GDL with appropriate pore diameter, thickness, and hydrophilic and hydrophobic properties is also effective to reduce flooding on the cathode catalyst layer, resulting in the higher PEFC performance compared with that for a hydrophobic MPL coated GDL.

DOI： 10.1299/kikaib.78.1849

Language：English   Publishing type：Research paper (scientific journal)  

Gas diffusion layers (GDLs) coated with a hydrophobic microporous layer (MPL) have been commonly used to improve the water management properties of polymer electrolyte fuel cells (PEFCs). In the present study, a new hydrophilic and hydrophobic double MPL coated GDL was developed to achieve further enhancement of PEFC performance under no-humidification at the cathode. The hydrophobic MPL, which consists of carbon black and polytetrafluoroethylene (PTFE), was coated on the carbon paper substrate. The hydrophilic layer, which consists of carbon black and polyvinyl alcohol (PVA), was also coated on the hydrophobic MPL. The hydrophilic layer is effective for conserving humidity at the catalyst layer, while the hydrophobic intermediate layer between the hydrophilic layer and the substrate prevents the removal of water in the hydrophilic layer via dry air in the substrate. Both decrease in the hydrophilic layer thickness to 5 μm and appropriate enhancement of hydrophilicity by increasing the PVA content to 5 mass% are effective for enhancing PEFC performance. Reducing the maximum pore diameter of hydrophobic intermediate layer to 20 μm is also effective for enhancing PEFC performance. However, when the pore diameter of the hydrophobic layer becomes too small, concentration overpotential tends to increase, thereby lowering PEFC performance.

DOI： 10.1016/j.jpowsour.2011.10.002

Other Link： http://dx.doi.org/10.1016/j.jpowsour.2011.10.002

Language：English  

DOI： 10.1149/1.3635592

Other Link： http://dx.doi.org/10.1149/1.3635592

Language：English  

Language：English  

Electrochemical single electrode Peltier heat, Transported entropy, Endothermic, Electrochemical impedance spectroscopy, Integration, Overpotential

DOI： 10.1149/1.3570089

Other Link： http://dx.doi.org/10.1149/1.3570089

Language：Japanese  

Development of a PEFC with Serpentine Hybrid Pattern Gas Channels (4th Report, PEFC Performance without Humidification)
The development of a polymer electrolyte fuel cell (PEFC) without external humidification is one of the most important issues to increase total efficiency and reduce cost. In the present study, we have developed hybrid pattern gas channels consisting of interdigitated and serpentine gas flow channels for PEFCs. The effects of gas flow channels at the anode and cathode on PEFC performance without external humidification were investigated. The PEFC performance was significantly deteriorated when a conventional triple serpentine channel was used at both the anode and cathode. However, when using the serpentine hybrid flow channel in the cathode, the performance was improved because of preventing the water from exhausting from the cathode. Moreover, the gas which flowed through the low pressure serpentine flow channel in the serpentine hybrid flow channel possibly promoted spreading water vapor over the whole active area. The triple serpentine flow channel in the anode was indicated to enhance spreading the water to whole of active area. Accordingly, IR overpotential was decreased and thereby PEFC performance was enhanced.

DOI： 10.1299/kikaib.77.1138

Other Link： http://dx.doi.org/10.1299/kikaib.77.1138

Language：English  

Influences of Microporous Layer Design Parameters for Gas Diffusion Layer on Permeability and PEFC Performance
Gas diffusion layers (GDLs) coated with a microporous layer (MPL) have been commonly used to improve water management properties of polymer electrolyte fuel cells (PEFCs). However, the appropriate pore diameter, thickness and hydrophobicity of the MPL remain unclear. In the present study, the influences of MPL design parameters on permeability and PEFC performance were evaluated. A decrease in the pore diameter of the MPL reduces through-plane permeability significantly, but reduces in-plane permeability only slightly. Under high-humidity conditions, a decrease in the MPL pore diameter is effective for preventing flooding, enhancing PEFC performance. However, when the pore diameter becomes too small, PEFC performance tends to decrease. Reducing the MPL thickness improves in-plane permeability, enhancing the ability of the MPL to avoid flooding. Under low-humidity conditions, a decrease in the MPL pore diameter is effective for preventing drying-out of the MEA. Increasing the MPL thickness is also effective for maintaining the humidity of the MEA. However, when the MPL thickness becomes too large, the transport of oxygen to the electrode through the GDL is deteriorated, lowering PEFC performance.

DOI： 10.1299/jee.6.17

Other Link： http://dx.doi.org/10.1299/jee.6.17

Language：Japanese  

Hydrophilic and Hydrophobic Double MPL Coated Gas Diffusion Layer for Enhanced PEFC Performance under No-Humidification at the Cathode(Thermal Engineering)
Gas diffusion layers (GDLs) coated with a hydrophobic microporous layer (MPL) have been commonly used to improve the water management property of polymer electrolyte fuel cells (PEFCs). In the present study, the influence of a hydrophilic and hydrophobic double MPL on PEFC performance under no-humidification at the cathode was evaluated. The hydrophobic MPL using a PTFE (polytetrafluoroethylene) binder and the hydrophilic MPL using a PVA (polyvinyl alcohol) binder were coated on the carbon paper GDL substrate. The thin hydrophilic layer coated on the conventional hydrophobic MPL enhances the ability to prevent drying-up of the MEA, thereby enhancing PEFC performance. The hydrophilic layer is effective for conserving membrane humidity. The hydrophobic intermediate layer between the hydrophilic layer and the GDL substrate prevents removing the water in the hydrophilic layer via dry air in the substrate. Reducing the hydrophilic layer thickness to 5μm is effective for enhancing PEFC performance. Appropriate enhancement of hydrophilicity by increasing the PVA content to 5mass% is also effective for enhancing PEFC performance.

DOI： 10.1299/kikaib.76.772_2218

Language：Japanese  

Influence of Gas Diffusion Layers on PEFC Performance under No-Humidification Using Anode Gas Recirculation(Thermal Engineering)
Polymer electrolyte fuel cells (PEFCs) generally have external humidifiers to supply humidified hydrogen and oxidant gases. If a PEFC could be operated under no-humidification, humidifiers may be removed, resulting in a simplified PEFC system with increased total efficiency and reduced cost. The present study was carried out to clarify the influence of gas diffusion layers (GDLs) on PEFC performance under no-humidification using anode gas recirculation. For the anode GDL, it is important to increase water transport between the anode gas and the membrane electrode assembly (MEA). The anode GDL without a microporous layer (MPL) is effective for enhancing PEFC performance. For the cathode GDL, it is important to maintain humidity and prevent drying-up of the MEA. A double hydrophobic MPL coated on both sides of the GDL is effective for reducing gas permeability, thereby preventing removing the water in the MEA through the GDL via dry air at the cathode. The hydrophilic layer coated on the double MPL enhances the ability of the GDL to prevent drying-up. Appropriate hydrophilic layer thickness of 40μm is effective for enhancing PEFC performance. Reducing the pore diameter of the hydrophobic intermediate layer between the hydrophilic layer and the substrate is also effective for enhancing PEFC performance.

DOI： 10.1299/kikaib.76.771_1956

Language：English  

DOI： 10.1149/1.3484587

Other Link： http://dx.doi.org/10.1149/1.3484587

Language：English  

DOI： 10.1149/1.3484602

Other Link： http://dx.doi.org/10.1149/1.3484602

Language：English  

DOI： 10.1149/1.3484586

Other Link： http://dx.doi.org/10.1149/1.3484586

Language：Japanese  

Development of a PEFC with Serpentine Hybrid Pattern Gas Channels : 3rd Report, Effects of Co- and Counter-Flows on the Stability of the Output Voltage
In our previous study, we have developed a hybrid pattern gas flow channel design, where a serpentine flow channel is placed between interdigitated flow channels for polymer electrolyte fuel cells (PEFCs). In the present paper, using this flow channel design, we investigate the effects of gas flow direction on the output voltage under non-humidified cathode condition. As a result, we find a gas flow pattern that causes partial flooding by product water accumulation due to the gravity. Moreover, counter flow in the serpentine channel is found to increase the water content in the membrane, so that the fluctuation of the output voltages is suppressed. On the other hand, when the cathode outlet is downside, the above partial flooding is prevented. In addition to choosing this outlet, the counter flow of the serpentine and interdigitated flows is found to be effective to increase average output voltage and to suppress the fluctuation of the output voltage. In this case, the cathode outlet faces the inlet of the anode serpentine channel, where flow velocity is the highest in the anode flow channels. This gas flow pattern leads to sufficient supply of the product water at the cathode outlet to the anode side channels by the back-diffusion. Thus, the fluctuation of the output voltage is also minimized.

DOI： 10.1299/kikaib.76.767_1011

Other Link： http://ci.nii.ac.jp/naid/110007682113

Language：Japanese  

Language：Japanese  

Language：Japanese  

Language：English  

Other Link： http://dx.doi.org/10.1149/1.3210729

Language：English   Publishing type：Research paper (scientific journal)  

Tatsumi KITAHARA, Toshiaki KONOMI, Hironori NAKAJIMA and Makoto MURATA, Effects of Design Parameters in Paper Type Gas Diffusion Layer on the Performance of Polymer Electrolyte Fuel Cells (Measures to Prevent Flooding and Drying-Up, Vol. 4, No. 2, pp. 338-345 (2009)

Other Link： http://dx.doi.org/10.1299/jee.4.338

Language：Japanese  

Influences of Microporous Layer Design Parameters for Gas Diffusion Layer on Permeability and PEFC Performance(Thermal Engineering)
Gas diffusion layers (GDLs) coated with a microporous layer (MPL) have been commonly used to improve water management properties of polymer electrolyte fuel cells (PEFCs). However, the appropriate pore diameter, thickness and hydrophobicity of the MPL remain unclear. In the present study, the influences of MPL design parameters on permeability and PEFC performance were evaluated. A decrease in the pore diameter of the MPL reduces through-plane permeability significantly, but reduces in-plane permeability only slightly. Under high-humidity conditions, a decrease in the MPL pore diameter is effective for preventing flooding, enhancing the PEFC performance. However, when the pore diameter becomes too small, the PEFC performance tends to decrease. Reducing the MPL thickness improves in-plane permeability, enhancing the ability of the MPL to avoid flooding. Under low-humidity conditions, a decrease in the MPL pore diameter is effective for preventing drying-out of the MEA. Increasing the MPL thickness is also effective for maintaining the humidity of the MEA. However, when the MPL thickness becomes too large, the transport of oxygen to the electrode through the GDL is deteriorated, lowering the PEFC performance.

DOI： 10.1299/kikaib.75.755_1524

Language：Japanese  

Impedance Analysis of a Micro Tubular Solid Oxide Fuel Cell : 1st Report, Separate Analysis of the Impedances of the Anode and Cathode(Thermal Engineering)
A separate analysis of the anode and cathode impedances of a practical solid oxide fuel cell (SOFC) has been performed. Electrochemical impedance spectroscopy is used for the analysis of a micro tubular SOFC havig anode-supported electrolyte with two-electrode set-up. This cell is composed of an Ni/(ZrO_2)_<0.9>(Y_2O_3)_<0.1> cermet anode, an La_<0.8>Sr_<0.2>Ga_<0.8>Mg_<0.2>O_<2.8> electrolyte, and an La_<0.6>Sr_<0.4>(Co_<0.2>Fe_<0.8>)O_3 cathode. Measurements are carried out for the cell operated at 700℃ with varying flow rate and composition of H_2-N_2 mixture gas fed into the anode and those of air-O_2 mixture gas fed into the cathode. The anode and cathode impedances are thereby found to appear in low and high frequency regions, respectively. A common equivalent circuit model is applied for the complex nonlinear least squares curve fitting of impedance spectra to acquire the resistances and capacitances of the charge and mass transfers at the anode and cathode, and the cell Ohmic resistance. Then variation of those parameters of the equivalent circuit in accordance with anode gas feed conditions are obtained for the practical SOFC. They are useful parameters for health diagnosis of SOFCs.

DOI： 10.1299/kikaib.75.755_1510

Language：Japanese  

Impedance Analysis of a Micro Tubular Solid Oxide Fuel Cell : 1st Report, Separate Analysis of the Impedances of the Anode and Cathode(Thermal Engineering)
A separate analysis of the anode and cathode impedances of a practical solid oxide fuel cell (SOFC) has been performed. Electrochemical impedance spectroscopy is used for the analysis of a micro tubular SOFC havig anode-supported electrolyte with two-electrode set-up. This cell is composed of an Ni/(ZrO_2)_<0.9>(Y_2O_3)_<0.1> cermet anode, an La_<0.8>Sr_<0.2>Ga_<0.8>Mg_<0.2>O_<2.8> electrolyte, and an La_<0.6>Sr_<0.4>(Co_<0.2>Fe_<0.8>)O_3 cathode. Measurements are carried out for the cell operated at 700℃ with varying flow rate and composition of H_2-N_2 mixture gas fed into the anode and those of air-O_2 mixture gas fed into the cathode. The anode and cathode impedances are thereby found to appear in low and high frequency regions, respectively. A common equivalent circuit model is applied for the complex nonlinear least squares curve fitting of impedance spectra to acquire the resistances and capacitances of the charge and mass transfers at the anode and cathode, and the cell Ohmic resistance. Then variation of those parameters of the equivalent circuit in accordance with anode gas feed conditions are obtained for the practical SOFC. They are useful parameters for health diagnosis of SOFCs.

DOI： 10.1299/kikaib.75.755_1510

Language：Japanese  

A Study on the Exhaust Process of the Product Water in the PEFC by EDX Mapping of a Tracer(Thermal Engineering)
The present work addresses the clarification of the exhaust process of the product water in the polymer electrolyte fuel cell using a tracer. Magnesium acetate tetrahydrate and a surfactant (polyoxyethylene di-styrenated phenyl ether) are dissolved into distilled water to prepare the tracer. The magnesium tracer is painted on the separator or electrode (catalyst layer) side of gas diffusion layers (GDLs) and dried. After operating a cell with these GDLs, magnesium at the surface and cross-section of the GDLs is captured ex-situ by energy dispersive X-ray spectroscopy (EDX) mapping on scanning electron microscope (SEM) images. In the case of the GDL having microporous layer (MPL), water produced at the rib part electrode of the cathode is found to be transported to the interspace between the channel part MPL and electrode in liquid phase. A part of the water is possibly transported through the MPL to the channel in gas phase. The water accumulated at the interspace is also found to be exhausted through the MPL to the channel in gas phase. Moreover, the suppression mechanism of the flooding by the MPL is shown as follows. The MPL repels condensed water in the GDL substrate, preventing transport of the liquid water to the electrode, so that the water accumulates in the GDL substrate.

DOI： 10.1299/kikaib.75.753_1119

Language：Japanese  

Development of a PEFC with Serpentine Hybrid Pattern Gas Channels : 1st Report, Design and Performance of the PEFC
We have developed hybrid pattern gas channel consisting of high and low pressure gas channels for polymer electrolyte fuel cells (PEFCs). The pressure difference between them gives rise to inplane flow in the gas diffusion layer (GDL) under the rib. This hybrid pattern gas channel allows to configure both parallel and serpentine gas channels for the high pressure channels. The low pressure channel is a serpentine gas channel to improve water exhaust ability by its large flow velocity. By taking advantage of the hybrid pattern gas channels, stability of the cell voltage is improved by increase in the flow velocity of the high pressure gas channel when it is switched to the serpentine gas channel. Moreover, atmospheric air introduced into the low pressure gas channel without humidification can dry and exhaust product water extruded to the GDL under the low pressure gas channel. However, flow rate of this air should be optimized to avoid output voltage drop due to the drying of the membrane electrode assembly.

DOI： 10.1299/kikaib.75.752_569

Other Link： http://ci.nii.ac.jp/naid/110006685208

Language：Japanese  

Development of a PEFC with Serpentine Hybrid Pattern Gas Channels : 2nd Report, Effects of the Flow Velocity in a Low Pressure Channel
We have developed hybrid pattern gas channels consisting of high and low pressure channels for polymer electrolyte fuel cells (PEFCs). The pressure difference between them gives rise to in-plane flow in the gas diffusion layer (GDL) under the rib. The high pressure channel is an interdigitated gas channel and the low pressure channel is a serpentine gas channel having smaller cross-sectional area than that in the 1st report of this work. An in-house separator is used for the cathode to vary the air flow velocity in the low pressure channel. By taking advantage of the hybrid pattern gas channels, maximum current density and stability of the cell voltage are significantly improved by an increase in the flow velocity in the low pressure channel. In contrast, a decrease in the flow velocity in the low pressure channel leads to a decrease in the current density at which sudden rise of IR overpotential due to the drying of the membrane electrode assembly occurs.

DOI： 10.1299/kikaib.75.752_577

Other Link： http://ci.nii.ac.jp/naid/110007226517

Language：Japanese  

Other Link： https://doi.org/10.1299/kikaib.75.749_170

Language：Japanese  

Analysis of Water Balance in a PEFC at Transient Operation Mode : Effects of the Properties of Gas Diffusion Layers on the Concentration Overpotential in a PEFC with Serpentine Flow Channels Under Start-Up Mode
We have analyzed the dependence of the concentration overpotentials on the properties of gas diffusion layers (GDLs) of a polymer electrolyte fuel cell (PEFC) using dual serpentine flow fields during a start-up operation. Moreover, we directly and separately analyze such dependence of the amount of the water accumulated at each component of a cell by measuring the weight of adherent water. As a result, the hydrophobic treatment with micro porous layer addition to a GDL substrate is found to be effective to improve the cell performance by suppressing the water accumulation at the electrode (catalyst layer) which increases the concentration overpotential. Suppressed water accumulation at the electrode also increases cumulative current that represents the power generation and calorific power important for warm-up. Besides, increase in the coarseness of the GDL substrate is not so effective for decreasing the concentration overpotential and increasing the cumulative current for the case of the serpentine flow field. Increase in the thickness of the GDL substrate increases the concentration overpotential and decreases the cumulative current. These results will offer proper design parameters of GDLs for improving the performance of PEFCs, in particular during start-up.

Language：English   Publishing type：Research paper (international conference proceedings)  

Best Combination of Gas Diffusion Layers for Polymer Electrolyte Fuel Cell under Cathode Condition of Very Low Humidity

DOI： 10.1149/1.2982000

Other Link： http://dx.doi.org/10.1149/1.2982000

Language：Japanese  

Language：English  

Other Link： http://dx.doi.org/10.1149/1.2982051

Language：Japanese  

Language：Japanese  

We have analysed the diffusion impedance of a polymer electrolyte fuel cell (PEFC) by electrochemical impedance spectroscopy (EIS). As a result, we derive oxygen diffusion distance d adjacent to the cathode electrode (catalyst layer) assuming planar oxygen diffusion in a thin water layer unlike the conventional flooded-agglomerate model and gas phase diffusion model in a gas diffusion layer. The experimental results and their analyses show that δ agrees with a value reported from our previous ex-situ measurement. Moreover, δ gives reasonable concentration overpotentials. Increasing current density and gas humidification brings about the growth of S. It supports that δ corresponds to the thickness of the accumulated product water in liquid state at the cathode electrode. Thus EIS analysis of the diffusion impedance can be used to diagnose the water accumulation at the cathode electrode. This result enables the prediction of the flooding and drying-up of PEFCs and assures their stable operation.

Language：Japanese  

Language：Japanese  

Language：Japanese  

Language：Japanese  

Effects of Design Parameters in Paper Type Gas Diffusion Layer on the Performance of Polymer Electrolyte Fuel Cells : Measures to Prevent Flooding and Drying-Up
The experiments to understand the dependency of the gas diffusion layer (GDL) design parameters on the performance of polymer electrolyte fuel cells (PEFCs) were carried out using the test apparatus in which the clamp pressure of the cell could be controlled. The behavior of the PEFC performance was highly influenced by the humidity of the supplied gas. Under high-humidity conditions, the hydrophobic treatment to the GDL substrate improved the PEFC performance with reducing the flooding magnitude, resulting in decreasing concentration overpotential. Much higher effect to prevent the flooding was achieved with putting a microporous layer (MPL). Under low-humidity conditions, both of the hydrophobic treatment and the MPL worked to prevent drying-up of the MEA, resulting in minimizing IR, activation and concentration overpotentials. The MPL coating substrate with larger air permeability was better to prevent the flooding, and the substrate with the smaller air permeability was better to prevent the drying-up.

Language：English  

Other Link： http://dx.doi.org/10.1149/1.2798676

Language：English  

Language：English   Book type：Scholarly book

Mass Transfer - Advanced Aspects, Hironori Nakajima (Ed.), ISBN: 978-953-307-636-2

Other Link： http://www.intechopen.com/books/show/title/mass-transfer-advanced-aspects

Language：English   Book type：Scholarly book

Lattice Boltzmann Modeling of the Gas Diffusion Layer of the Polymer Electrolyte Fuel Cell with the Aid of Air Permeability Measurements, in Mass Transfer -Advances in Sustainable Energy and Environment Oriented Numerical Modeling , Hironori Nakajima (Ed.), ISBN 978-953-51-1170-2

Other Link： http://dx.doi.org/10.5772/56363

Language：English   Book type：Scholarly book

Electrochemical Impedance Spectroscopy Study of the Mass Transfer in an Anode-supported Microtubular Solid Oxide Fuel cell, in Mass Transfer - Advanced Aspects, Hironori Nakajima (Ed.), ISBN: 978-953-307-636-2

Other Link： http://www.intechopen.com/books/show/title/mass-transfer-advanced-aspects

Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

<p>Ni/ZnO nanowire (NW) catalysts for ammonia cracking are prepared and evaluated for hydrogen production for applications such as fuel cells. NW catalysts are expected to be more durable than conventional nanoparticle catalysts because of their three-dimensional structure that prevents agglomeration. In this study, we introduce a hierarchical structure to the NWs to increase the active surface area. The NW catalysts are prepared by hydrothermally synthesizing ZnO NWs and coating them with Ni.</p>

DOI： 10.1299/jsmeted.2023.a124

CiNii Research

Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

<p>Direct local current and temperature measurements were performed in a planar solid oxide electrolysis cell (SOEC) by segmenting the anode (oxygen electrode) to measure the actual spatial current and temperature distributions for high temperature steam electrolysis along the cathode (hydrogen electrode) flow channels. Under voltage control, the currents and temperatures in the upstream, midstream, and downstream segments along the reactant vapor flow were successfully measured.</p>

DOI： 10.1299/jsmeted.2023.a133

CiNii Research

Event date： 2023.10

Language：Japanese   Presentation type：Oral presentation (general)  

<p>The analysis of the three-dimensional current density, concentration, and temperature distribution in solid oxide fuel cell (SOFC) cells and stacks has conventionally required high computational cost. In this study, we measure the current distributions in a planar test cell with segmented electrodes, which are used to construct and verify a three-dimensional finite element (FE) model. A surrogate model is generated with machine learning using current densities for the cell voltages, gas concentrations, and temperatures as training data predicted from the FE model, which is expected to reduce the computational cost.</p>

DOI： 10.1299/jsmeted.2023.a131

CiNii Research

Event date： 2023.10

Language：English  

Venue：Gothenburg   Country：Sweden  

Water Transport Modeling in a Microporous Layer for a Polymer Electrolyte Membrane Water Electrolyzer Having a Gas-Liquid Separating Interdigitated Flow Field

Event date： 2023.10

Language：English  

Country：Other  

Hybrid Reactor by the Combination of Water Electolyzer with Methanation Reactor Targeting the Space and Terrestrial Applications

Event date： 2023.10

Language：English  

Venue：Gothenburg   Country：Sweden  

Liquid Water Permeability in a Hydrophobic Microporous Layer for the Anode Interdigitated Flow Field of a Gas-Liquid Separating Polymer Electrolyte Membrane Water Electrolyzer

Event date： 2023.8

Language：Japanese  

Country：Other  

Event date： 2023.8

Language：Japanese   Presentation type：Oral presentation (general)  

<p>Tokyo Gas is working on the social implementation of methanation, which can achieve carbon neutrality of gaseous energy while effectively utilizing existing city gas infrastructure, with the aim at realizing a carbon neutral society by 2050. For the social implementation of methanation, we report on efforts to develop innovative methanation technology, hybrid-Sabatier technology, using low temperature process in order to improve methane synthesis efficiency and reduce costs compared to conventional technology.</p>

DOI： 10.20550/jietaikaiyoushi.32.0_102

CiNii Research

Event date： 2023.7

Language：English  

Country：United States  

Event date： 2023.5 - 2023.6

Language：English  

Venue：Boston   Country：United States  

Electric aircraft have attracted attention to reducing carbon dioxide emissions and fuel consumption. Compared with conventional aircraft, distributed propulsion with electric motors is expected to increase the efficiency of the propulsion systems for the above purpose. Furthermore, the application of solid oxide fuel cell (SOFC) – gas turbine (GT) hybrid systems to their electric power sources is promising for higher efficiency. We have thus developed a three-dimensional numerical model of a planar SOFC pressurized for the combination with a GT for the optimal design and operation of practical cells. A software package with the finite element method (COMSOL Multiphysics 5.4) is employed to analyze the current and temperature distributions in a cell. Exchange current densities under pressurized conditions are experimentally evaluated using a symmetric test cell for the electrochemical kinetics in the model.

Event date： 2023.5

Language：Japanese  

Venue：東京   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Ammonia decomposition for hydrogen production with Ni/ZnO nanowire catalysts

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Liquid Water Permeability Test for a Microporous Layer Applied to a Gas-Liquid Separating Polymer Electrolyte Membrane Water Electrolyzer

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.7

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：佐賀   Country：Japan  

Event date： 2022.7

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Development of CO2 hydrogenation-water electrolysis tandem reactor

Event date： 2021.11

Language：Japanese  

Country：Japan  

Development of CO2 hydrogenation-water electrolysis tandem reactor

Event date： 2021.10

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Pore Network Modeling of Hydrophilic / Hydrophobic Composite Microporous Layers for Polymer Electrolyte Fuel Cells

Event date： 2021.10

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Mass Transfer in Microporous Layers for Polymer Electrolyte Fuel Cells Analyzed with Pore Network Modeling

Event date： 2021.10

Language：Japanese  

Country：Other  

Event date： 2021.7

Language：English   Presentation type：Oral presentation (general)  

Country：Other  

Evaluation of Three-Dimensional Placement of Built-in Catalytic Partial Oxidation Catalyst in an Anode-Supported Honeycomb SOFC

Event date： 2021.7

Language：English  

Country：Sweden  

Spatial Current and Temperature Variations in a Microtubular Solid Oxide Electrolysis Cell In-Situ Analyzed with Electrode-Segmentation Method

Event date： 2020.12

Language：Japanese  

Country：Japan  

Event date： 2020.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Other  

Tandem system by the combination of a novel water elctrolyzer with CO2 hydrogenation reactor

Event date： 2020.10

Language：English  

Country：Switzerland  

Characteristics of a Planar SOFC With Load Variation (A1515)

Event date： 2020.10

Language：Japanese  

Country：Other  

Hydrogen Production From Methanol Steam Reforming With ZnO/CuO Nanowire Catalyst

Event date： 2020.10

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Experimental and Numerical Analyses of Mass Transfer in Solid Oxide Cells

Other Link： https://doi.org/10.1149/MA2020-02402515mtgabs

Event date： 2020.10

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Pore Network Modeling of Microporous Layers for Polymer Electrolyte Fuel Cells

Other Link： https://doi.org/10.1149/MA2020-02533841mtgabs

Event date： 2020.10

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Fabrication and Evaluation of an Anode-Supported Honeycomb SOFC with Built-in Catalytic Partial Oxidation Micro-Reformer

Other Link： https://doi.org/10.1149/MA2020-02533842mtgabs

Event date： 2020.9

Language：English   Presentation type：Oral presentation (general)  

Country：Other  

Fuel Cell Research for Carbon Recycle Society

Other Link： http://www.iae.kyoto-u.ac.jp/zero_emission/symposium/

Event date： 2020.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

Other Link： https://confit.atlas.jp/guide/event/ecsj2020s/subject/1A04/tables?cryptoId=

Event date： 2019.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/SOFC28_program.pdf

Event date： 2019.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/SOFC28_program.pdf

Event date： 2019.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/SOFC28_program.pdf

Event date： 2019.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： https://kesco.co.jp/conference/comsol-conference-2019-tokyo/session/

Event date： 2019.10

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Atlanta   Country：United States  

Other Link： https://ecs.confex.com/ecs/236/meetingapp.cgi/Paper/125399

Event date： 2019.10

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Atlanta   Country：United States  

Other Link： https://ecs.confex.com/ecs/236/meetingapp.cgi/Paper/125552

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Sapporo   Country：Japan  

Other Link： http://www3.scej.org/meeting/apcche2019/abst/m3a-abstracts.html

Event date： 2019.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Kyoto   Country：Japan  

Other Link： http://www.eguchi-lab.ehcc.kyoto-u.ac.jp/SOFC_XVI/

Event date： 2019.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Kyoto   Country：Japan  

Other Link： http://www.eguchi-lab.ehcc.kyoto-u.ac.jp/SOFC_XVI/

Event date： 2019.6 - 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：関西学院大学（西宮市）   Country：Japan  

Event date： 2019.6

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Kyoto   Country：Japan  

Other Link： http://www.iae.kyoto-u.ac.jp/chemical/NGRC2019/

Event date： 2019.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡市   Country：Japan  

Event date： 2018.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/27thSOFC_Symposium_Program_REV2.pdf

Event date： 2018.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/30thMemorial.pdf

Event date： 2018.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/30thMemorial.pdf

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪市   Country：Japan  

Other Link： http://www.knt-ec.net/2018/denchi59/pdf/program_jpn_20181031fin.pdf

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪市   Country：Japan  

Other Link： http://www.knt-ec.net/2018/denchi59/pdf/program_jpn_20181031fin.pdf

Event date： 2018.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山コンベンションセンター   Country：Japan  

Event date： 2018.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Tromsø to Trondheim   Country：Norway  

Other Link： https://www.ntnu.edu/web/kifee/kifee-10-symposium

Event date： 2018.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Tromsø to Trondheim   Country：Norway  

Other Link： https://www.ntnu.edu/web/kifee/kifee-10-symposium

Event date： 2018.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Tromsø to Trondheim   Country：Norway  

An anode-supported honeycomb solid oxide fuel cell (SOFC) gives high volumetric power density and improves thermo-mechanical durability at high temperatures. We have so far shown the promising power densities and investigated the effect of the internal flow channel configurations on the cell performance in terms of the hydrogen partial pressure distributions in the cell under operation. In this study, we have investigated the current distribution of anode-supported honeycomb solid oxide fuel cells by finite element analysis and proposed new flow channel structures for practical use

Other Link： https://www.ntnu.edu/web/kifee/kifee-10-symposium

Event date： 2018.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：日本大学（御茶ノ水キャンパス） 東京都   Country：Japan  

Event date： 2018.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Fukuoka   Country：Japan  

Other Link： http://www.icnn5.org/

Event date： 2018.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Tongji University, Shanghai   Country：China  

Other Link： https://ssic.tongji.edu.cn/English/Homepage.htm

Event date： 2018.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Tongji University, Shanghai   Country：China  

Other Link： https://ssic.tongji.edu.cn/English/Homepage.htm

Event date： 2018.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Tongji University, Shanghai   Country：China  

Other Link： https://ssic.tongji.edu.cn/English/Homepage.htm

Event date： 2018.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Paris   Country：France  

Other Link： https://thermec2018.sciencesconf.org/

Event date： 2018.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Rio de Janeiro   Country：Brazil  

Other Link： http://www.whec2018.com/

Event date： 2018.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Rio de Janeiro   Country：Brazil  

Other Link： http://www.whec2018.com/

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宇部市   Country：Japan  

Other Link： https://doi.org/10.1299/jsmepes.2018.23.C114

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡市   Country：Japan  

Other Link： https://doi.org/10.1299/jsmekyushu.2018.71.F21

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡市   Country：Japan  

Other Link： https://doi.org/10.1299/jsmekyushu.2018.71.F22

Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/30thMemorial.pdf

Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/30thMemorial.pdf

Event date： 2017.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/30thMemorial.pdf

Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Tokyo   Country：Japan  

Event date： 2017.9 - 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Sun Moon Lake   Country：Taiwan, Province of China  

Event date： 2017.9 - 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Sun Moon Lake   Country：Taiwan, Province of China  

An anode-supported honeycomb solid oxide fuel cell (SOFC) gives high volumetric power density and improves thermo-mechanical durability at high temperatures. We have so far shown the promising power densities and investigated the effect of the internal flow channel assignments and the porous anode support thicknesses on the cell performance in terms of the hydrogen partial pressure distributions in the cell under operation. In this study, we measure ohmic resistances of the honeycomb cells by current interrupt method, and indicate the impact of Ni reoxidation in the anode support resulting in high internal ohmic resistances. Fuel depletion in the cell causes the Ni reoxidation, and deteriorates the performance of the honeycomb cell.

Event date： 2017.9 - 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Sun Moon Lake   Country：Taiwan, Province of China  

Event date： 2017.9 - 2017.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Sun Moon Lake   Country：Taiwan, Province of China  

Event date： 2017.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Hollywood, FL   Country：United States  

Other Link： https://ecs.confex.com/ecs/sofc2017/webprogram/Paper100945.html

Event date： 2017.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Hollywood, FL   Country：United States  

Other Link： https://ecs.confex.com/ecs/sofc2017/webprogram/Paper101037.html

Event date： 2017.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Hollywood, FL   Country：United States  

Other Link： https://ecs.confex.com/ecs/sofc2017/webprogram/Paper100936.html

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：埼玉県   Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2017.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Phoenix   Country：United States  

Other Link： http://www.mrs.org/spring2017

Event date： 2017.4

Language：English   Presentation type：Oral presentation (general)  

Venue：Nagasaki   Country：Japan  

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/SOFC25_Program.pdf

Event date： 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Other Link： http://sofcjapan.o.oo7.jp/SOFC25_Program.pdf

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路市   Country：Japan  

Event date： 2016.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：姫路市   Country：Japan  

Event date： 2016.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Honolulu   Country：United States  

Other Link： https://ecs.confex.com/ecs/230/webprogram/Paper91174.html

Event date： 2016.10

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Honolulu   Country：United States  

Other Link： https://ecs.confex.com/ecs/230/webprogram/Paper91121.html

Event date： 2016.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Kyoto   Country：Japan  

Other Link： http://www.iae.kyoto-u.ac.jp/chemical/NGRC2016/program.html

Event date： 2016.9

Language：English   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

Venue：Ho Chi Minh   Country：Viet Nam  

Event date： 2016.8

Language：English   Presentation type：Oral presentation (general)  

Venue：Interlaken   Country：Switzerland  

Other Link： https://mh2016.ch/wp-content/uploads/programm/all_abstracts_mh2016.pdf

Event date： 2016.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Lucerne   Country：Switzerland  

Other Link： http://www.efcf.com/Agenda.pdf

Event date： 2016.7

Language：English   Presentation type：Oral presentation (general)  

Venue：Lucerne   Country：Switzerland  

Other Link： http://www.efcf.com/Agenda.pdf

Event date： 2016.6 - 2015.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Krakow   Country：Poland  

Other Link： http://www.eurotherm2016.agh.edu.pl/wp-content/uploads/eurotherm_programme_final.pdf

Event date： 2016.6 - 2015.6

Language：English   Presentation type：Oral presentation (general)  

Venue：Krakow   Country：Poland  

Other Link： http://www.eurotherm2016.agh.edu.pl/wp-content/uploads/eurotherm_programme_final.pdf

Event date： 2016.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Event date： 2015.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Event date： 2015.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Event date： 2015.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：富山市   Country：Japan  

Event date： 2015.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：富山市   Country：Japan  

Event date： 2015.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Taipei   Country：Taiwan, Province of China  

Other Link： http://www.ise-online.org/annmeet/folder/66th_Annual_meeting_program.pdf

Event date： 2015.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Glasgow   Country：United Kingdom  

Event date： 2015.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Glasgow   Country：United Kingdom  

Event date： 2015.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Glasgow   Country：United Kingdom  

Event date： 2015.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡市   Country：Japan  

Event date： 2014.11

Language：English   Presentation type：Oral presentation (general)  

Venue：京都市   Country：Japan  

Event date： 2014.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2014.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2014.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Cancun   Country：Mexico  

Event date： 2014.9

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：福岡市，佐賀県唐津市   Country：Japan  

Event date： 2014.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都市   Country：Japan  

Event date： 2014.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：長野県軽井沢町   Country：Japan  

Event date： 2014.6

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Fukuoka   Country：Korea, Republic of  

Event date： 2014.2

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Fukuoka   Country：Japan  

Event date： 2013.12

Language：English   Presentation type：Oral presentation (general)  

Venue：Las Vegas   Country：United States  

Event date： 2013.11

Language：English   Presentation type：Oral presentation (general)  

Venue：San Francisco   Country：United States  

Event date： 2013.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：弘前市   Country：Japan  

Event date： 2013.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：弘前市   Country：Japan  

Event date： 2013.10

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Fukuoka   Country：Japan  

Event date： 2013.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Okinawa   Country：Japan  

Event date： 2013.8

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：軽井沢   Country：Japan  

Event date： 2013.1

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：Fukuoka   Country：Japan  

Event date： 2013.1

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：Fukuoka   Country：Japan  

We have developed an anode-supported honeycomb SOFC that can achieve high power density and enhanced durability. Electrolyte layer of 8YSZ is employed by dip-coating on an anode honeycomb substrate of Ni/8YSZ, followed by being coated with cathode layer of LSM. We measure the current-voltage and current-power density characteristics of the cells having different anode and cathode flow channel configurations at 850℃. The results exhibit promising performances of the cell for developing stacks composed of multiple honeycomb cells. A comparison with numerical calculation by the finite element method also gives information for further improvement of the cell.

Event date： 2012.11

Language：Others   Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2012.10

Language：Others   Presentation type：Oral presentation (general)  

Venue：Honolulu   Country：United States  

Event date： 2012.10

Language：Others   Presentation type：Oral presentation (general)  

Venue：Honolulu   Country：United States  

Event date： 2012.9

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：Trondheim   Country：Norway  

Event date： 2011.10 - 2010.10

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2011.10 - 2010.10

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2011.9

Language：Others   Presentation type：Oral presentation (general)  

Venue：Boston   Country：United States  

Event date： 2011.5

Language：Others   Presentation type：Oral presentation (general)  

Venue：Montreal   Country：Canada  

Event date： 2011.2

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2011.2

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2010.11 - 2009.11

Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

R. Matsumoto, H. Nakajima, and T. Kitahara, Current Distribution in a Microtubular SOFC Estimated from Temperature Measurement, The 51th Battery Symposium in Japan

Event date： 2010.11 - 2009.11

Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

T. Jo, H. Nakajima, and T. Kitahara, Research on a Test Method for the Incorporation of Metallic Particles in a Lithium Ion Battery, The 51th Battery Symposium in Japan

Event date： 2010.10

Language：Others   Presentation type：Oral presentation (general)  

Venue：Las Vegas   Country：United States  

Event date： 2010.2

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2010.1

Language：Others   Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2009.11 - 2008.12

Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Drying Process inside a PEFC after Finishing Electric Generation，The 50th Battery Symposium in Japan

Event date： 2009.10

Language：Others   Presentation type：Oral presentation (general)  

Venue：Vienna   Country：Austria  

Event date： 2009.7

Language：Others   Presentation type：Oral presentation (invited, special)  

Venue：京都大学   Country：Japan  

Event date： 2009.2

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2008.12

Language：Others   Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2008.11

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：大阪   Country：Japan  

Event date： 2008.11

Language：Others   Presentation type：Symposium, workshop panel (public)  

Venue：大阪   Country：Japan  

Event date： 2008.10

Language：Others   Presentation type：Oral presentation (general)  

Venue：Honolulu, Hawaii   Country：United States  

Other Link： http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=MAECES000802000011001120000001&idtype=cvips&gifs=yes

Language：Others   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Other Link： http://www.electrochem.jp/program/2007fall/room_a.html

Language：Others   Presentation type：Oral presentation (general)  

Venue：熊本大学   Country：Japan  

Other Link： http://ci.nii.ac.jp/naid/110006635155/en/

Event date： 2023.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

researchmap

Event date： 2023.10

Language：English  

Country：Other  

Effect of the Hydrophilic Layer in Double Microporous Layer Coated Gas Diffusion Layer on PEFC Performance

Event date： 2023.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Event date： 2022.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2022.10

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Effect of Hydrophilic Layer in Double Microporous Layer Coated Gas Diffusion Layer on PEFC Performance

Event date： 2022.7

Language：Japanese  

Country：Other  

Event date： 2021.10

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Hydrophilic and Hydrophobic Microporous Layer Coated Gas Diffusion Layer for Enhancing PEFC Performance

Event date： 2021.7

Language：Japanese  

Country：Other  

Event date： 2020.10

Language：English  

Country：United States  

Analysis of Influence of Cathode Current Collector Wettability on Current Loss By Crossover Evaluation Both at Cathode and Anode Side

Other Link： https://doi.org/10.1149/MA2020-02382473mtgabs

Event date： 2019.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪市   Country：Japan  

Other Link： http://www.knt-ec.net/2018/denchi59/pdf/program_jpn_20181031fin.pdf

Event date： 2018.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：大阪市   Country：Japan  

Other Link： http://www.knt-ec.net/2018/denchi59/pdf/program_jpn_20181031fin.pdf

Event date： 2018.10

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：岡山コンベンションセンター   Country：Japan  

Event date： 2018.6

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：宇部市   Country：Japan  

Other Link： https://doi.org/10.1299/jsmepes.2018.23.C113

Event date： 2018.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡市   Country：Japan  

Other Link： https://doi.org/10.1299/jsmekyushu.2018.71.F23

Event date： 2017.7

Language：English   Presentation type：Symposium, workshop panel (public)  

Venue：Hollywood, FL   Country：United States  

Other Link： https://ecs.confex.com/ecs/sofc2017/webprogram/Paper100951.html

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：埼玉県   Country：Japan  

Event date： 2017.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：埼玉県   Country：Japan  

Event date： 2016.11 - 2016.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan  

Other Link： https://conv.toptour.co.jp/2016/bsj57web/program/pdf/program.pdf

Event date： 2016.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Honolulu   Country：United States  

Other Link： https://ecs.confex.com/ecs/230/webprogram/Paper84865.html

Event date： 2016.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Honolulu   Country：United States  

Other Link： https://ecs.confex.com/ecs/230/webprogram/Paper90689.html

Event date： 2016.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Honolulu   Country：United States  

Other Link： https://ecs.confex.com/ecs/230/webprogram/Paper94281.html

Event date： 2016.10

Language：English   Presentation type：Oral presentation (general)  

Venue：Honolulu   Country：United States  

Other Link： https://ecs.confex.com/ecs/230/webprogram/Paper87039.html

Event date： 2015.12

Language：English   Presentation type：Oral presentation (general)  

Venue：東京都   Country：Japan  

Event date： 2015.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋市   Country：Japan