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

The effect of cathode current collectors on polymer electrolyte membrane water electrolysis (PEMWE) was evaluated with I-V and I-high frequency resistance (HFR) characteristics. Results reveal that cathode current collectors can impact water electrolysis performance by controlling the amount of water accumulation there, which is proved with overpotential analysis and systematic operation such as feeding additional nitrogen gas to cathode. The hydrophilic cathode current collectors invited better performance than hydrophobic ones, because the hydrophilic ones gives less water accumulation there and enough water content in catalyst coated membrane (CCM). The thickness of cathode current collector did not impact the performance.

DOI： 10.1149/06918.0003ecst

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

DOI： 10.1016/j.ijhydene.2015.03.045

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

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 m 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

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

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

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

DOI： 10.1149/2.0881410jes

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

DOI： 10.1016/j.ijheatmasstransfer.2014.03.038

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

In the second report, a method for measuring the spatial distribution of the electric current generated in a PEFC from the frequency shift of the Nuclear Magnetic Resonance (NMR) signal of water acquired by eight planar surface coils inserted into the PEFC was described. In this paper, a newly-developed technique to calculate the current density distribution from the measured frequency shifts using inversion analysis is presented. In this technique, the PEFC is divided into eight elements, and the current which flows through the eight elements is searched so that the frequency shift calculated by　magnetic field
analysis and the frequency shift obtained by experiment come into agreement. In order to shorten the computation time
consumed in this technique, an efficient algorithm was developed in which the current is searched by an iterative calculation
using the equation between that relates the current and the spatial gradient of the frequency shift. The spatial distribution of
the current density could be obtained using eight iterations of the inversion analysis algorithm.

DOI： [DOI: 10.1299/transjsme.2014tep0093

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Publisher：International Journal of Hydrogen Energy  

Operation at high current density of polymer electrolyte membrane electrolysis cell (PEMEC) can reduce its electrode area and capital expense. The high current density operation is limited by the limiting current density (LCD), where electrolysis voltage abruptly increases. Effects of operating temperature and pressure on the LCD were evaluated in a lab-scale PEMEC within a range from 70 to 90 °C and from 0.1 to 0.3 MPa. Also, a theoretical model was developed to predict the LCD, and to clarify what determines LCD and how the operating conditions influence the LCD. The theoretical analysis suggests that when current density is close to the LCD, water mass transport at anode reaches a limitation, which indicates that water saturation reaches almost zero at anodic catalyst layer. The analysis also finds that lower operating temperature and higher operating pressure can reduce oxygen gas saturation and raise the water saturation in porous transport layer at anode, and finally enlarge the LCD.

DOI： 10.1016/j.ijhydene.2024.05.345

Web of Science

Scopus

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

Publisher：International Journal of Hydrogen Energy  

Novel Ru-core Ir-shell catalyst-integrated porous transport electrodes (PTEs) for polymer electrolyte membrane water electrolysis (PEMWE) cells are prepared, in which Ru-core Ir-shell catalyst nanostructures are directly deposited onto a porous transport layer (PTL) via arc plasma deposition (APD). The PTL has a nanostructured TiO2 surface prepared via NaOH etching, acting as a catalyst support. The performance and durability of these Ru-core Ir-shell catalysts depend strongly on the ratio of Ir and Ru. The current-voltage (I–V) characteristics of PEMWE cells were improved by applying these core-shell catalysts with a low Ir loading of around 0.1 mg cm−2. The core-shell catalyst-integrated PTEs can operate at current densities of up to 10 A cm−2 without exhibiting limiting current behavior. This unique combination of the core-shell catalyst and the PTE structure enables PEMWE cell operation with low iridium loading and high current density, potentially reducing the cost of green hydrogen.

DOI： 10.1016/j.ijhydene.2023.07.048

Web of Science

Scopus

Publisher：Green Energy and Technology  

In this paper, a steady one-dimensional heat transfer model is proposed to predict the rise in the gas diffusion layer (GDL) of the cathode caused by the catalytic combustion of a mixture of hydrogen and air in a polymer electrolyte membrane fuel cell (PEMFC). Relative humidity (RH) cycling tests using hydrogen gas and air were conducted on a PEMFC embedded membrane NRE211 at the current density of 0 (i.e. open circuit voltage (OCV)), 0.05, and 0.3 Acm−2. After every 200 RH cycles, catalytic combustion was analyzed during OCV measurement using the thermal imaging method, employing a high-transmittance glass on the cathode side. Hotspots created due to combustion were successfully captured, with a maximum temperature rise of approximately 16 °C compared to the operating temperature of 80 °C. The heat transfer model predicts the GDL’s temperature rise fairly well and indicates that the combustion heat is predominantly transferred to the hydrogen stream due to the high convective heat transfer coefficient. During OCV measurements, the membrane temperature is increased but remains well below its auto-ignition temperature of 300 °C. However, the formation of pinholes in the scanning electron microscope images at the current density of 0 Acm−2 revealed the instant occurrence of accidental combustion during the RH cycling test when the infrared camera was not employed.

DOI： 10.1007/978-981-97-1868-9_60

Scopus

Publisher：Frontiers in Energy Research  

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

Web of Science

Scopus

Publisher：Journal of the Electrochemical Society  

Reducing platinum group metal (PGM) loading and high current density operation are both essential for minimizing the capital expenditure (CAPEX) of polymer electrolyte membrane (PEM) electrolyzers. Catalyst-integrated porous transport electrodes (PTEs) in which iridium acts as both a catalyst and a conductive coating on porous transport layer (PTL) surfaces, enable the preparation of Pt-coating-free PTLs, but can also result in relatively high activation and ohmic overvoltages. Here, a novel hybrid anode design combining an intermediate catalyst layer and a catalyst-integrated PTE is developed. This hybrid anode demonstrates that Ir on PTL can contribute to the oxygen evolution reaction (OER) and exhibits comparable electrolysis performance to a conventional anode consisting of Pt-coated PTL with the same Ir loadings despite Pt-coating-free on the PTL of the hybrid anode. This novel anode eliminates the need for a Pt coating whilst also enabling ultra-high current density operations up to 20 A cm−2 with a total PGM loading of only around 0.6 mg cm−2 on the anode side. This paper proposes a next-generation anode structure with new functions of PTLs for ultra-high current density operation with low PGM loading to significantly reduce green hydrogen costs.

DOI： 10.1149/1945-7111/ad1165

Web of Science

Scopus

Publisher：Journal of Energy Storage  

The electrode segmentation method has been applied to experimentally assess the current and temperature distributions in a cathode-supported microtubular solid oxide electrolysis cell (mt-SOEC). A detailed three-dimensional SOEC model considering the mass/momentum/charge/energy transfer is also developed to explain the in-situ working mechanism with spatial current and temperature variations considering the electrochemical performance and degradation. Both the experimental and numerical results reveal that the electrode-segmentation method exhibits notable nonuniform current and temperature distributions among the segments (up-, mid-, and downstream). Reactant starvation in the mid- and downstream regions leads to spatial current and temperature variations, with the largest temperature gradient observed and predicted between the up- and midstream regions. Further analysis of the temperature variations indicates that endothermic electrochemical Peltier heat in the air (oxygen) electrode (anode) is the primary cause of temperature decrease from 1.0 V to 1.3 V, while heat production with the overpotentials in the fuel (hydrogen) electrode (cathode) dominates temperature increase above 1.3 V.

DOI： 10.1016/j.est.2023.108459

Web of Science

Scopus

Publisher：International Journal of Heat and Mass Transfer  

Since water electrolysis is a pollution-free and economical method to produce hydrogen which has a great potential as an energy carrier, it is imperative to improve the performance of water electrolysis for efficient hydrogen production. Supposing that the analogy between boiling and water electrolysis holds, the next interesting question is whether the water electrolysis performance can also be significantly improved by using a method that improves the heat transfer coefficient and the critical heat flux (CHF). The critical current density (CCD), which is the upper operation limit of water electrolysis, is considered to be one of the keys for effective hydrogen generation. However, the study on the enhancement of CCD has rarely been conducted. It is known that the boiling CHF can be improved by a honeycomb porous plate (HPP) due to two effects, capillary force and path separation of gas-liquid. In this work, we applied a cooling method using an HPP which has succeeded in improving the boiling CHF to alkaline water electrolysis. For the first time, we have succeeded in improving the CCD to approximately 1.3 times (CCD: 6.6 A/cm2) compared to without capillary force case (CCD: 5.1 A/cm2). As regards the mechanism, the effect of the liquid supply by capillary action and the improvement of the bubble discharge by separating the gas–liquid flow path using the honeycomb structure of the HPP play an important role in increasing the CCD.

DOI： 10.1016/j.ijheatmasstransfer.2023.124420

Web of Science

Scopus

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

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

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

Publisher：Journal of Power Sources  

Water boiling in a polymer electrolyte membrane water electrolyzer (PEMWE) has been experimentally demonstrated to reduce the electrolysis voltage [Ito K et al. ECS Transactions. 2017; 80(8):1117]. The boiling phenomenon and formation mechanism are studied comprehensively by introducing boiling into a PEMWE model. The gas saturation at the channel/porous transfer layer (PTL) is first determined as the boundary condition for the gas transfer in the PTL. Then, the gas transfer equation can be used to determine the oxygen and hydrogen pressures at the catalyst layer (CL). The dissolved oxygen and hydrogen activities are considered in the activation overvoltages through a variable (activation fraction). Finally, the Nernst loss, activation, and ohmic overvoltage of the PEMWE over a wide temperature range (encompassing non-boiling, boiling, and gas-phase-only conditions) are determined from the oxygen and hydrogen pressures and gas saturation at the CL. The results show that the PEMWE under boiling conditions has the lowest electrolysis voltage among the non-boiling, boiling, and gas-phase conditions. Boiling can accelerate the detachment of gas bubbles composed of gaseous oxygen and water vapor in the channel (CH). Furthermore, vigorous boiling significantly reduces the Nernst loss by reducing the oxygen and hydrogen partial pressures at the CL.

DOI： 10.1016/j.jpowsour.2023.233143

Web of Science

Scopus

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

DOI： https://doi.org/10.1016/j.jpowsour.2023.233143

Publisher：Journal of Power Sources  

The durability of a water electrolysis cell against wind power voltage fluctuations was evaluated by developing an accelerated potential fluctuation test protocol based on wind power voltage fluctuations over an actual 24 h period of operation. Accelerating potential protocol tests corresponding to 160 d of actual operation were performed. The current loss during the test is mostly recovered if rest time was included during the operation. Reversible loss is most likely related to gas stagnation, suppression of oxygen reduction reaction activity owing to the formation less active Ir(V) species, and suppression of gas evolution owing to the increased hydrophilic surface. This irreversible loss can be attributed to the dissolution of IrO2 and the loss of Nafion® ionomer. Even though the potential fluctuation itself was not a problem if the lowest potential was 1.0 V, the upper limit of the potential was rather problematic. When the upper potential is increased to 2.3 V, the oxidation of IrO2 is enhanced, leading to the partial dissolution of IrO2, followed by the formation of a dense structure, a decrease in the oxygen evolution reaction activity, and an increase in the surface hydrophilicity.

DOI： 10.1016/j.jpowsour.2023.232826

Web of Science

Scopus

Publisher：Journal of Power Sources  

Inhomogeneous current and temperature distributions are harmful to the durability of solid oxide electrolysis cells (SOECs). A high steam utilization is favorable for system efficiency, but also enhances the inhomogeneity. This study combines segmented SOEC experiments, multiphysics simulation, and neural network to optimize the inhomogeneity and efficiency jointly. A three-dimensional (3D) cell model is built and experimental validation shows that the model correctly predicts the decreased down-stream current after the steam utilization exceeds 0.8. Fast surrogate models are trained with the simulation data and integrated into a multi-objective optimization problem for numerical solution. Its solutions form a Pareto front quantifying the conflicting relationship between the steam utilization, inhomogeneity, voltage, hydrogen production and working temperature, from which optimal solutions are chosen to achieve a trade-off. Under a power density of 1.11 W cm−2, the ratio between the down-stream and up-stream currents drops from 63.1% to 55.2% when the steam utilization increases from 0.72 to 0.82. The Pareto fronts can enhance the collaboration between stack manufacturers and system operators by enabling the latter to optimize the operating point for a balance between system efficiency and inhomogeneity.

DOI： 10.1016/j.jpowsour.2023.232760

Web of Science

Scopus

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

DOI： https://doi.org/10.1016/j.jpowsour.2023.232826

Publisher：Journal of Power Sources  

This study elucidates the effects of current density on membrane degradation under combined mechanical and chemical stress tests. Relative humidity (RH) cycling tests using hydrogen gas and air are conducted on a polymer electrolyte membrane fuel cell based membrane NRE211 at the open circuit voltage (OCV), 0.05 and 0.3 Acm−2 conditions. The different current density conditions result in different in-plane membrane stresses and H2O2 formation rates during the test. After every 200 RH cycles, membrane integrity is assessed via the hydrogen crossover rate and OCV. Furthermore, catalytic combustion is analyzed during OCV measurement using a thermal imaging method employing high-transmittance glass at the cathode side. The membrane failed after 1600, 1800, and 2200 RH cycles under the OCV condition, 0.05 of 0.3 Acm−2, respectively. The vigorous membrane degradation under OCV conditions can be attributed to higher mechanical stress and H2O2 formation rate. Hotspots created owing to the combustion between the crossover hydrogen and air were successfully captured, with a maximum temperature rise ranging from 15 to 16 °C compared with a given cell temperature of 80 °C. Moreover, a post-mortem analysis (SEM imaging) revealed the presence of pinholes, through-membrane cracks, and membrane thinning at the hotspot locations.

DOI： 10.1016/j.jpowsour.2022.232446

Web of Science

Scopus

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

DOI： https://doi.org/10.1016/j.jpowsour.2022.232446

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

Publisher：Journal of Power Sources  

This study is focused on elucidating the catalytic combustion phenomenon in proton-exchange-membrane fuel cells. A visualization cell and an infrared (IR) camera are used to capture the thermal behavior under combined chemical and mechanical accelerated stress conditions in situ. Catalyst coated membrane (CCM) embedded in the cell is subjected to a relative humidity (RH) cycling test under open-circuit voltage (OCV) conditions at atmospheric pressure and at a cell temperature of 80 °C. The temperature distribution on the gas diffusion layer surface at the cathode is captured through a high-transmittance glass window (ZnS window). Continuous IR imaging revealed a hot spot at ca. 500 RH cycles, suggesting the existence of a pinhole in the degraded CCM and the occurrence of catalytic combustion there. The occurrence of the hot spot coincides with the time at which the electrochemical indicators detect membrane failure, i.e., hydrogen crossover rate, OCV. Furthermore, a post mortem analysis revealed a 105-μm diameter pinhole, the position of which matched that of the hot spot. This pinhole is responsible for the rapid increase in the hydrogen crossover rate as well as the significant decrease in the OCV at 500 RH cycles until the end of the durability test.

DOI： 10.1016/j.jpowsour.2022.231803

Web of Science

Scopus

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

Publisher：International Journal of Hydrogen Energy  

The high initial cost of polymer electrolyte membrane water electrolyzers (PEMWEs) has delayed their widespread commercialization. A possible means to reduce cost is by reducing the overvoltage and increasing the current density to reduce the electrode area. This study proposes a novel method in which boiling is superimposed on the oxygen evolution reaction (OER) to decrease electrolysis voltage. The vapor bubbles formed by boiling are expected to decrease the concentration overvoltage. The boiling effect was experimentally analyzed using a three-electrode cell. Although a general catalyst layer (CL) was formed on a working electrode (WE) bar, the structure of the working electrode (WE) bar was special, in which a 10-W heater was embedded and made boiling on the electrode under 1 bar condition. Increasing the electrode temperature under static OER current density slightly decreased the OER potential. However, an abrupt decrease in potential was observed when the temperature was scaled over the boiling temperature. Moreover, this abrupt decrease substantially intensified when, similar to a practical PEMWE, a porous transfer layer (PTL) and flow channel were assembled on the CL. These experimental results suggest that boiling can reduce the concentration overvoltage by reducing the oxygen concentration on the CL, especially when the mass transport resistance caused by the PTL is considerable. Innovatively and simply utilizing boiling, as proposed here, can enhance the oxygen transfer and contribute to reducing the initial cost of PEMWEs.

DOI： 10.1016/j.ijhydene.2022.06.010

Web of Science

Scopus

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

Publisher：ECS Transactions  

An advantage of polymer electrolyte membrane water electrolysis (PEMWE) over other water electrolysis technologies is its ability to operate at high current densities. However, resistive heating during. In this study, the internal cell temperature distribution at high current densities up to 12 A cm-2 is evaluated through numerical simulation. The correlation between the temperature gradient in the cell and the flow rate of water supplied is examined. An increase in water supply is effective in minimizing high temperature gradients at higher current densities.

DOI： 10.1149/10909.0437ecst

Scopus

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

DOI： DOI: 10.1149/1945-7111/abb37d

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

DOI： https://doi.org/10.1016/j.ijhydene.2020.05.153

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

DOI： DOI: 10.1149/2.0521904jes

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

DOI： DOI: 10.1149/2.0521904jes

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

DOI： https://doi.org/10.1016/j.ijhydene.2018.07.030

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

DOI： 10.1016/j.ijhydene.2018.02.171

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

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： doi:10.1149/08008.1117ecst

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

DOI： 10.1039/c7ta01318c

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

DOI： 10.1016/j.jpowsour.2016.09.086

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

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DOI： 10.1016/j.jmr.2013.06.015

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

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

DOI： PEFC12

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

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Event date： 2012.6 - 2012.5

Presentation type：Oral presentation (general)  

Venue：富山   Country：Japan  

Hydrogen energy society needs stable supply of high pressure hydrogen gas at 40 MPa or more than that, such for FCVs. Although mechanical compressor has the role of pressurizing hydrogen gas so far, it has rather low reliability and its energy efficiency has not reached acceptable revel. Against this situation we expect electrochemically-driven booster, so-called hydrogen pump, where hydrogen gas is pressurized by proton immigration from anode to cathode through MEA (membrane electrode assembly) with loading DC voltage. The hydrogen pump is expected that it has high reliability because of no mechanical links, and that it has high efficiency because isothermal process progresses in principle. Considering actual situation, such as practical pressure condition and practical humidification for polymer electrolyte membrane involved, we designed, fabricated and operated an electrochemical hydrogen pump. Cell voltage and load current obtained gave both the voltage and current efficiency of hydrogen, leading that it shows definite performance comparing conventional mechanical compressor.

Event date： 2012.3

Presentation type：Oral presentation (general)  

Venue：インチョン   Country：Korea, Republic of  

Event date： 2011.11 - 2011.12

Presentation type：Oral presentation (general)  

Venue：東京、船堀ホール   Country：Japan  

Event date： 2011.11 - 2011.12

Presentation type：Oral presentation (general)  

Venue：東京、船堀ホール   Country：Japan  

Event date： 2011.10

Presentation type：Oral presentation (general)  

Venue：静岡大学   Country：Japan  

Event date： 2011.6

Presentation type：Oral presentation (general)  

Venue：関西大学   Country：Japan  

Event date： 2011.6 - 2006.6

Presentation type：Oral presentation (general)  

Venue：岡山   Country：Japan  

Event date： 2011.6 - 2006.6

Presentation type：Oral presentation (general)  

Venue：岡山   Country：Japan  

Event date： 2010.11

Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

Event date： 2010.10

Presentation type：Oral presentation (general)  

Venue：長岡   Country：Japan  

Event date： 2010.5

Presentation type：Oral presentation (general)  

Venue：札幌   Country：Japan  

Event date： 2010.5

Presentation type：Oral presentation (general)  

Venue：札幌   Country：Japan  

Event date： 2010.5

Presentation type：Oral presentation (general)  

Venue：札幌   Country：Japan  

Event date： 2010.5

Presentation type：Oral presentation (general)  

Venue：札幌   Country：Japan  

Event date： 2009.12

Venue：東京   Country：Japan  

Event date： 2009.6

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Event date： 2009.6

Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Event date： 2008.12

Venue：堺   Country：Japan  

Event date： 2008.12

Venue：堺   Country：Japan  

Event date： 2008.11 - 2008.10

Presentation type：Oral presentation (general)  

Venue：堺   Country：Japan  

Event date： 2008.10

Presentation type：Oral presentation (general)  

Venue：北九州   Country：Japan  

Event date： 2008.5

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Venue：長崎   Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Korea, Republic of  

Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：名古屋   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Venue：北九州   Country：Japan  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：長崎   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：長崎   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：長崎   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Venue：北九州   Country：Japan  

Venue：北九州   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：札幌   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：福岡   Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：東京   Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京海洋大学越中島キャンパス（東京都江東区）   Country：Japan  

Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京海洋大学越中島キャンパス（東京都江東区）   Country：Japan  

Event date： 2023.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京海洋大学越中島キャンパス（東京都江東区）   Country：Japan  

Event date： 2023.5

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2023.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2023.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2023.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：福岡国際会議場   Country：Japan  

Event date： 2021.11 - 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：横浜   Country：Japan  

Event date： 2021.11 - 2021.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：横浜   Country：Japan  

Event date： 2021.7

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

Venue：北海道   Country：Japan  

Event date： 2021.7

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

Venue：北海道   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Event date： 2019.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Event date： 2017.12

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

Country：Korea, Republic of  

Event date： 2017.12

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

Country：Japan  

Event date： 2017.12

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

Venue：東京   Country：Japan  

Event date： 2017.12

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

Venue：大阪   Country：Japan  

Event date： 2017.12

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

Venue：大阪   Country：Japan  

Event date： 2017.12

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

Country：Korea, Republic of  

Event date： 2017.12

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

Venue：東京   Country：Japan  

Event date： 2017.12

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

Country：Japan  

Event date： 2017.12

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

Venue：東京   Country：Japan  

Event date： 2017.12

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

Venue：東京   Country：Japan  

Event date： 2017.12

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

Venue：東京   Country：Japan  

Event date： 2017.12

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

Venue：東京   Country：Japan  

Event date： 2017.12

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

Venue：東京   Country：Japan  

Event date： 2017.12

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

Venue：東京   Country：Japan  

Suppressing gas leakage from PEFC is critical issue in its space application. In this study, a PEFC stack (4cells, electrode area is 25cm2) places in a vacuum chamber to simulate space environment, and flow rate of the hydrogen gas leakage from the stack is measured under different condition to analyze the impacts of crumping force, internal pressures, relative humidity and load current density. In addition, a theoretical model for leakage rate based on Persson contact theory is developed and solved. The leakage rate theoretically obtained agreed with experimental results. Through this agreement, how the each condition impacts clarified. As for a specific interest, it is noted that lower relative humidity makes the Young’s modulus of PEM higher and causes larger gap between PEM and gasket, resulting in larger leakage.

Event date： 2017.12

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

Venue：東京   Country：Japan  

Gas crossover occurs in a polymer electrolyte fuel cell, and the cell is possibility damaged by catalytic combustion. In this study, infrared imaging is used to measure temperature distribution in a cells without and with a pinhole. The catalytic combustion is numerically analyzed with thermal balance equation. These analyses show that combustion occurs on the catalyst layer even at room temperature. Mixture gas of hydrogen and air introduced into the cathode side leads to temperature rise within the area of the catalyst layer, suggesting catalytic combustion, but its rate is rather small possibly due to the low hydrogen and oxygen concentrations at the catalyst surface. In the cell with a pinhole, temperature rises near the pinhole. Gas flow through the pinhole by diffusion and convection is also found.

Event date： 2017.12

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

Country：Japan  

Event date： 2017.12

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

Country：Japan  

Event date： 2017.11

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

Venue：東京   Country：Japan  

Event date： 2017.11

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

Venue：東京   Country：Japan  

Hydrogen energy society requests to improve performance of the polymer electrolyte membrane electrolysis cell. This paper attempts to reduce electrolysis voltage by superimposing boiling on the electrolysis. Owing to the thermodynamic coupling, a reaction proceeded in spontaneous manner (boiling) possibly accelerates a reaction proceeded in non-spontaneous manner (electrolysis). This idea is evaluated by experiment and analysis. The experiment, where a PEMEC is operated with changing cell temperature from 80 to 120°C, revealed that electrolysis voltage abruptly decreased near the boiling point. The analysis with the thermodynamic coupling and Butler-Volmer’s equation reproduced the tendency appeared in the experiment, suggesting that boiling superimposed on the electrolysis reduce its voltage.

Event date： 2017.11

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

Venue：東京   Country：Japan  

Event date： 2017.11

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

Venue：福岡   Country：Japan  

Event date： 2017.11

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

Venue：福岡   Country：Japan  

In PEFC, hydrogen and oxygen gas permeate through PEM each other, and produce hydrogen peroxide and water on platinum catalyst in moderate rate. In addition to chemical degradation in PEM by the hydrogen peroxide, mechanical degradation progress with elapsed time and cause pinholes. In a worse case, the pinholes trigger to form some amount of H2/Air mixture gas, which burns in cell and make significant damage on cell components. To clarify the damaging process by the combustion, in this paper, reaction rate of catalytic combustion on platinum was measured in ex-situe manner with DSC. The measurement results suggested that higher temperature and hydrogen concentration raise the rate. This nature is qualitatively reproduced in theoretically calculated rate considering elementary processes and chemical species related to the catalytic combustion.

Event date： 2017.5

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

Venue：大宮   Country：Japan  

SOFCs are high efficient system to generating electricity, and expected to be utilized as generator in larger scale. In this scenario, more reliable and continuous operation is required with diagnosis technology, which can sensitively detect the performance deterioration, namely internal resistance increase caused by cell components degradation and failed modules in SOFC system. As a diagnostic, this study introduces DRT (distribution of relaxation time) spectroscopy to quantify the internal resistances in a planner-type SOFC stack, and challenges to identify which peak appeared in the spectroscopy corresponds to the internal resistance. The DRT spectroscopy obtained in different operation conditions gives an identification: peak emerged at about 0.2 and 3.0 Hz attributes to cathode and anode concentration overpotential resistance respectively. Those appeared above 100 Hz come from activation overpotential resistances.

Event date： 2017.5

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

Venue：大宮   Country：Japan  

In a polymer electrolyte fuel cell (PEFC), hydrogen and oxygen gas permeate through polymer electrolyte membrane, and form hydrogen-oxygen mixture gas. Some amount of the mixture combusts or reacts to produce hydrogen peroxide. These unexpected reactions degrades the membrane, reduces the performance of PEFC, and destroys cell at worse case. However, the combustion in PEFCs and the degradation process have not been well characterized. This study challenges to quantitatively grasp the catalytic combustion in PEFCs by differential scanning calorimetry (DSC). Hydrogen-air mixture gas is supplied over platinum samples and reference in DSC. First, a platinum plate is used to validate the accuracy of the measurement of combustion by DSC. Second, the catalytic combustion rate on a catalyst coated membrane (CCM) is measured by DSC. Measurement results suggest that the reaction rate increases with the increase of hydrogen gas concentration and temperature, and that the activation energy of the reaction on CCM is smaller than that on the platinum plate

Event date： 2017.5

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

Venue：大宮   Country：Japan  

The polymer electrolyte membrane water electrolysis (PEWE) is expected to be used as one of method to produce hydrogen gas. However, PEWE is expensive, and thus the price of hydrogen gas produced by it is expensive. Once performance of PEWE, such as voltage efficiency, is improved, less electricity and smaller electrode area are realized, reducing the price. In this study, we challenge to increase the efficiency (decrease electrolysis voltage) by a thermodynamic coupling, where boiling is superimposed on PEWE electrochemical reaction. We conduct water electrolysis in the temperature range of 80 – 120℃ under 0.10 and 0.12 MPa. Experimental result confirmed that boiling can reduce electrolysis voltage. Theoretical analysis based on the mathematical modeling, where the thermodynamic coupling is embedded, gives a quantitative discussion for the voltage reduction obtained.

Event date： 2016.10

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

Venue：愛媛　（松山）   Country：Japan  

固体高分子形燃料電池(polymer electrolyte fuel cell, PEFC)は今後、航空宇宙分野での利用が拡大することが予想されている。航空機内や宇宙空間で燃料電池を運転するには、周囲から孤立し、周囲が低圧あるいは真空である点に注意しながら、システムの簡素化や、適切な熱管理を行う必要がある。本研究では、航空宇宙分野での特殊性を踏まえて、PEFCスタックを低圧雰囲気下で運転し、冷却水流量、加湿器の有無、ガス再循環の有無の影響を調査したので報告する。

Event date： 2016.9

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

Venue：福岡   Country：Japan  

Event date： 2016.9

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

Venue：福岡   Country：Japan  

Event date： 2016.6

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

Venue：横浜   Country：Japan  

Event date： 2016.5

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

Venue：大阪   Country：Japan  

Event date： 2016.5

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

Venue：大阪   Country：Japan  

Event date： 2016.5

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

Venue：大阪   Country：Japan  

Event date： 2015.12

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

Country：Japan  

Event date： 2015.6

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

Venue：仙台   Country：Japan  

Event date： 2015.6

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

Venue：福岡   Country：Japan  

Event date： 2015.6

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

Venue：福岡   Country：Japan  

Event date： 2015.6

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

Venue：福岡   Country：Japan  

Event date： 2015.6

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

Venue：福岡   Country：Japan  

Event date： 2014.6

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

Venue：福井   Country：Japan  

Event date： 2014.6

Language：English  

Country：Korea, Republic of  

Event date： 2014.6

Language：English  

Country：Korea, Republic of  

Event date： 2013.10

Presentation type：Symposium, workshop panel (public)  

Venue：弘前   Country：Japan  

Event date： 2013.10

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

Venue：弘前   Country：Japan  

Event date： 2013.6

Presentation type：Symposium, workshop panel (public)  

Venue：千葉   Country：Japan  

Event date： 2013.5

Presentation type：Symposium, workshop panel (public)  

Venue：仙台   Country：Japan  

Event date： 2013.5

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

Venue：浜松   Country：Japan  

Event date： 2012.11

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

Venue：熊本   Country：Japan  

Presentation type：Oral presentation (general)  

Venue：京都   Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Presentation type：Oral presentation (general)  

Country：Japan  

Language：Japanese   Presentation type：Oral presentation (general)  

<p>Energy losses inherit in PEFC structure was analyzed to find optimum cell structure. As for a representative cell, JARI cell was examined and analyzed with simple model. In the model, the losses are calculated with distinguishing current loss, mass transport loss, heat flow loss, which are irreversible losses when current, mass transport and heat flow occur in cell. Loss analysis found that current loss, in particular activation overvoltage, is the largest of the components, and current loss determines the efficiency of the fuel cell. An enlarged electrode area embedded in the cell was proposed to reduce the current loss. Since there is a trade-off relationship between the three losses, we calculated the electrode area so that the total loss is minimized. We also examined the effect of expanding the electrode area on the output density.</p>

DOI： 10.1299/jsmepes.2022.26.d133

CiNii Research

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

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Department of Hydrogen Energy Systems in Graduate School of Engineering, Kyushu University, has been established in April, 2010. Histories of its establishment and the educational concept in this Department are explained. The educational program to realize the concept is described. Achievement thorough our activity in this Department is verified with the satisfactory employment trend.

Language：Japanese  

Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Language：Japanese   Publishing type：Internal/External technical report, pre-print, etc.  

Publishing type：Internal/External technical report, pre-print, etc.  

Language：Japanese   Publishing type：Internal/External technical report, pre-print, etc.  

Type：Competition, symposium, etc. 

Number of participants：100

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：500

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：100

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：30

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：500

Type：Competition, symposium, etc. 

Number of participants：500

Type：Competition, symposium, etc. 

Number of participants：300

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：500

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：100

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：200

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：500

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：50

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Number of participants：50