092-583-8857

092-583-7897

Doctor of Science

Yes　Doctor

Surface science

02years00months

My research subject is development of new high-efficiency functional carbonaceous materials to solve energy and environmental problems. I guide students and researchers through daily research and educate them through seminars. Our laboratory accepts many foreign researchers.

Research Interests

• Elucidation of key factors of molecular adsorption selectivity of activated carbons
  keyword : selectivity, adsorption, pore, carbon materials
  2018.04～2021.03Most of porous materials lose their adsorption ability under high humid condition because of inhibitive adsorption of water molecules. To overcome this problem, I introduce new concept to new carbonaceous porous material. The carbon material, which I will try to prepare, possesses shallow hydrophobic pores. The hydrophobicity and shallowness of pores and would allow easy desorption of water molecules..
• Development of versatile assessment method of pore shape for disordered complex porous materials
  keyword : pore, shape, porous materials, 129Xe-NMR
  2019.04～2022.03.
• Development of carbon material for adsorption heat pump
  keyword : Carbon material, Adsorption heat pump, Adsorption amount, Adsorption kinetics
  2011.11～2015.03.
• Elucidation of surface and pore properties of carbon materials by solid-state NMR method using water molecule as a surface probe
  keyword : adsorption, surface, pore, carbon materials, water molecule, surface probe, solid-state NMR
  2011.04～2014.03.
• Mechanism elucidation of development of pore structure by using hyper-polarized 129Xe-NMR technique
  keyword : adsorption, pore, carbon materials, hyper-polarized 129Xe-NMR
  2010.04～2012.03.
• Development of carbon materials having shallow hydrophobic pores as high performance adsorbent even in humid atmosphere
  keyword : adsorption, competive adsorption, pore, carbon materials
  2008.02～2010.03Most of porous materials lose their adsorption ability under high humid condition because of inhibitive adsorption of water molecules. To overcome this problem, I introduce new concept to new carbonaceous porous material. The carbon material, which I will try to prepare, possesses shallow hydrophobic pores. The hydrophobicity and shallowness of pores and would allow easy desorption of water molecules..

Current and Past Project

• Influence of various factors, such as pore size, surface functional groups, and surface structure, on 129Xe NMR spectra was quantitatively elucidated. The findings would enable to investigate pore structure and its development mechanism of carbonaceous porous materials, which have been difficult only by nitrogen adsorption measurements at 77 K.
• This project aims to develop high efficiency catalysts, with which gasification process progresses at low reaction temperature, and to fabricate the gasification process, in which enables catalyst separation.
• Development of prompt and continuous technologies for air quality conservation using activated carbon fibers and activated carbon nano-fibers
• Low temperature operational fuel cells such as direct methanol (DMFC) and polymer electrolyte membrane fuel cells (PEMFC) come into spotlight as promising power sources for many applications such as small portable electric devices, automotive and stationary domestic applications. Although a number of researches have been performed for last two decades, further development is still very necessary to reduce the cost markedly by decreasing the used amount of noble metals in the catalyst through the improvement of catalytic activities. In this study, the structure-controlled carbon nanofibers (CNFs) were synthesized to develop improved catalyst supports both for anode and cathode. The performances of the catalysts prepared by the selected CNFs were examined in both electrodes of DMFC and PEMFC.
  Very thin (diameter of 7 to 20 nm, denoted as CM55 for DMFC anode) and thin (40 to 70nm, NFM415 for PEMFC anode) Herringbone-type CNFs were attempted to be highly dispersed using a nano-dispersion equipment (T.K. FILMICSR Model 56-50, Primix Co., Japan) for releasing entangled network with specially designed impeller agitation of 16500 rpm for 30 minutes in distilled water. The maximum power densities of a commercial catalyst, Johnson Matthey PtRu60wt% catalyst (Pt: 2, Ru: 1, and Carbon: 2 mg/cm2), was 55, 121, 162 mW/cm2 at 30, 60, 90℃, respectively, for the DMFC anode. In comparison, the single cell performances of PtRu40wt% anode catalyst supported on CM55 for DMFC (Pt: 1.33, Ru: 0.67, and Carbon: 3 mg/cm2) were 62, 156 and 224 mW/cm2 at the cell temperature of 30, 60, and 90oC, respectively, even if the Pt and Ru contents were reduced by 36%. The high dispersed NFM415 was examined as the anode catalyst support of PEMFC. The Maximum power density of commercial Johnson Matthey catalyst (Pt: 0.45, Carbon: 1.68 mg/cm2) appeared to be 800 mW/cm2 at cell temperature of 80℃. On the other hand, the catalyst prepared by highly dispersed NFM415 and chemical reduction method using NaBH4 showed slightly lower value to be 771 mW/cm2, and the highest performance was observed at the catalyst prepared by NFM415 and reflux method to be 947 mW/cm2 at the same Pt weight base.
  GP-CNF-NA as the cathode catalyst support was prepared from Platelet-type CNFs through the graphitization at 2800℃ and nitric acid treatment to improve the oxidative stability for the DMFC and PEMFC cathode catalysts. The commercial Johnson Matthey Pt black (Pt: 2, Carbon: 0 mg/cm2) as the cathode catalyst of DMFC showed the single cell power densities of 46, 116, 164 mW/cm2 at the cell temperature of 30, 60, 90℃, respectively. The DMFC cathode catalyst supported on GP-CNF-NA (Pt: 0.8, Carbon: 1.2 mg/cm2) using chemical reduction method showed slightly lower power densities to be 32, 94, 146 mW/cm2. The Johnson Matthey Pt black (Pt: 3, Carbon: 0 mg/cm2) as the cathode catalyst of PEMFC showed the single cell power densities of 800 mW/cm2 at the cell temperature of 80℃. In comparison, the cathode catalysts using GP-CNF-NA (Pt: 0.4, Carbon: 0.6 mg/cm2) prepared by chemical reduction and reflux method showed the power densities to be 600 and 670 mW/cm2, respectively.
• Development of surface optimized carbon nano-fibers (CNFs) as new environmental catalyst
• Pitch based carbon fiber for the application of CFRP will be developed using POSCO coal tar as a raw material. The target properties of developed carbon fiber are as follow; Tensile strength: over 150 kg/mm2, Elongation: over 1.5 %, Compressive strength: over 70% of TS.

Academic Activities Membership in Academic Society

• The Iron and Steel Institute of Japan
• The Japan Society on Adsorption
• The Carbon Society of Japan
• The Chemical Society of Japan