Curriculum Vitaes
Profile Information
- Affiliation
- Professor, Faculty of Science and Technology Department of Science and Technology , Seikei University
- Degree
- 博士前期課程(立教大学)博士後期課程(東京工業大学)
- J-GLOBAL ID
- 200901056185449843
- researchmap Member ID
- 6000005065
Research Interests
6Research Areas
1Research History
10-
Jan, 2018 - Mar, 2019
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Apr, 2009 - Dec, 2012
Committee Memberships
5-
Jul, 2019 - Present
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Apr, 2019 - Present
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Mar, 2019 - Present
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Apr, 2012 - Present
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Apr, 2008 - Present
Awards
33Papers
129-
Vol9 827-841, Jan, 2026 Peer-reviewed
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Dalton Transactions, Nov, 2025 Peer-reviewedA series of isomorphous compounds MBP-1 (M: divalent metal cation) containing M 2 O 9 units bridged with 1,3,5-benzenetriphosphonate enable not only to change the metal cation but also to tune its metal site vacancy.
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Journal of Power Sources, 656 238008-238008, Nov, 2025 Peer-reviewed
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Energy Technology, Sep 7, 2025 Peer-reviewedLast authorLithium–air batteries (LABs) are a promising technology for high‐energy‐density battery storage. However, their open‐cell structure for oxygen exchange leads to electrolyte evaporation, which limits cycling performance under ambient conditions. Herein, volatile amide‐based electrolytes for LABs using gravimetric analysis are evaluated. The cell weight change during discharge–charge cycles confirms the two‐electron oxygen reduction/evolution reactions while also revealing that electrolyte evaporation correlates with the solvent vapor pressure. This behavior significantly compromises the cycle performance of low‐viscosity amide electrolyte cells. Despite this, rate‐dependent cycling experiments demonstrate the superior cyclability of the low‐viscosity amide electrolyte cells at high current rates (0.8 mA cm−2 or higher), conditions under which cells with a conventional tetraethylene glycol dimethyl ether (TEG)‐based LAB electrolyte fail. Scanning electron microscopy and X‐ray diffraction analyses show that these cells exhibit improved rechargeability at high‐rate cycles, with discharge product morphology changing to a more easily decomposable form. This electrolyte design strategy marks a significant advancement toward developing high‐power, high‐energy rechargeable LABs.
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ACS Applied Energy Materials, (8) 4370-4378, Apr, 2025 Peer-reviewedLast author
Misc.
183-
日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM), 29th ROMBUNNO.1V05, Aug 29, 2016
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太陽/風力エネルギー講演論文集 = Proceedings of JSES/JWEA Joint Conference, 379-382, 2016
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電子情報通信学会技術研究報告 = IEICE technical report : 信学技報, 115(357) 21-24, Dec 10, 2015
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電子情報通信学会技術研究報告, 115(357(OME2015 73-79)) 5‐8-8, Dec 3, 2015
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電気化学秋季大会講演要旨集(CD‐ROM), 2015 ROMBUNNO.1L21, Sep 7, 2015
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電気化学会大会講演要旨集(CD-ROM), 82nd ROMBUNNO.1S33, Mar 9, 2015
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Technical report of IEICE. OME, 114(383) 13-17, Dec 19, 2014To improve the energy density of electrochemical capacitors, we tried to fabricate a new hybrid capacitor system using Li pre-doped silicon (Si) anode, i.e. Si-CAP (Li pre-doped Si | 1 M LiBF_4/PC | active carbon(AC)). In this study, we adjusted the conditions of Li pre-doping especially for the thickness of Si-coated electrode and the time of Li pre-doping. As a result, Si thin electrode with short pre-doping time of 1 h exhibited the best performances for both discharge energy density and cycleability. Also, we investigated the effects of additives (vinylene carbonate (VC) and fluoroethylene carbonate (FEC)) to form better solid electrolyte interphase (SEI) film on the Si anode. Much more improvement of cycleability was found especially for FEC, and a high energy density of over 600 mWh g^<-1>(Si) was achieved even at the rate of 2000 mA g^<-1>(Si).
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Technical report of IEICE. OME, 114(383) 7-11, Dec 19, 2014To investigate the effects of carbon supports for La_<0.6>Sr_<0.4>MnO_3(LSM)/C catalysts on the catalytic activity and electrooxdation durability, we used Ketjen black (KB) and two kinds of carbon nanotubes with different diameter of 110 nm (CNT(φ100 nm)) and 20-30 nm (CNT(φ100 nm)). The LSM/C catalysts synthesized by a reversed micelle (RM) method exhibited that the carbon support with large surface area and high graphitization had advantages for the dispersion of LSM particle, oxygen reduction reaction (ORR) activity and durability. As a result, the LSM/CNT (φ20-30 nm) showed the best performances as air electrode catalyst. We also tried to examine the effects of partial substitution of Mn site by the other elements, i.e. the synthesis of La_<0.6>Sr_<0.4>Mn_<1-x>B_xO_3(LSMB_x, B=Fe(F), Co(C), Ni(N)), on the catalytic activities including oxygen evolution reaction (OER) activity. The examinations clarified that ORR and OER activities were improved by Co and Fe substitutions, respectively.
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Technical report of IEICE. OME, 114(383) 19-21, Dec 19, 2014"One-Step Liquid-Phase Synthsis" is our original one-step process which enable the synthesis of unique carbon nanomaterials (including carbon nanotubes (CNTs)) on a substrate resistance-heated in organic solvents. Recently, we successfully synthesized carbon nanomaterials (CNMs)/carbon paper (CP) composites in which the CNMs, mainly consisted of single walled CNTs (SWCNTs) with spider's web-like secondary structure, was twined around the fibers of CP substrate resistance-heated in ethanol solution containing a precursor of catalyst for CNT-growth. Hence, this study tried to deposit platinum nanoparticles on spider's web-like SWCNTs/CP composites with the motivation of developing electrode catalyst available for fuel cell. The "One-Step Liquid-Phase Synthesis" using CP substrate and ethanol solvent mixed with platinum acetylacetonate as well as cobalt acetylacetonate (precursor of catalyst for CNT-growth) successfully produced platinum nanoparticles on the CNMs/CP composites consisted of spider's web-like CNMs including SWCNTs; the existence of electrochemically active surfaces of platinum was demonstrated by the obvious peaks of hydrogen adsorption and desorption on the cyclic voltammograms.
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Technical report of IEICE. OME, 114(383) 37-40, Dec 19, 2014Non-platinum oxygen reduction catalysts made from iron cobalt complexes with 1,10-phenanthroline as a precursor supported on multi-wall carbon nanotubes were synthesized by heat treatment with ammonia atmospheres. The mechanism of oxygen reduction in alkaline solution for the catalysts was investigated by X-ray photoelectron spectroscopy and a rotating ring disk electrode method. The correlation coefficients were estimated between effective nitrogen chemical species on the surface of the oxygen reduction catalysts and cathodic current derived from oxygen reduction reaction or 4-electron reduction efficiency. There are no positive correlation between oxygen reduction reaction (ORR) current and the surface concentration of N species. In addition, pyridine-type and pyrrole-type nitrogen species had week negative correlation with ORR current and %H_2O.
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Technical report of IEICE. OME, 114(383) 41-44, Dec 19, 2014Ammonia is expected for the energy source of next generation, because the domestic production is almost 1.2 million ton a year. A highly active ammonia oxidation (AO) catalysts at low temperature needs to be developed to use ammonia as a fuel for the direct ammonia fuel cells (DAmFCs). In this study, shell-core catalysts made from the Pt, Rh and Ir complexes were synthesized with the combination of microwave-polyol, ethanol reductive and improved Cu-UPD (underpotential deposition) methods, and the performance of AO was evaluated. The results showed that the catalytic activity of the Pt shell-Ir core with the thinnest shell for AO was the highest in the catalysts. And the catalytic activity for AO with Pt outer shell/Ir inner shell/Rh core catalysts was lower than that with the thinnest Pt shell/Ir core catalyst, suggesting that an electronic effect from Rh core reached to the Pt outer shell.
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Technical report of IEICE. OME, 113(358) 13-16, Dec 17, 2013Inorganic - inorganic hybrid electrolytes were synthesized by mixing ZnO-2P_2O_5 glass with high mechanical properties and ZrO_2-1.6P_2O_5 electrolyte with high proton conductivity for intermediate temperature fuel cells operating at 200-300℃. (ZnO-2P_2O_5)-10 wt%(ZrO_2-1.6P_2O_5) hybrid electrolyte exhibited high proton conductivity of 3.3 × 10^<-2> S cm^<-1> at 125-300℃, indicating that the hybridization is effective to improve the proton conductivity of the glass electrolytes. In addition, The dissolution rate of proton (1.0 × 10^<-10> mol s^<-1> cm^<-2>) and the gas permeability coefficient of hydrogen (1.2×10^<-12> cm^3 cm cm^<-2> s^<-1> cmHg^<-1>) for the (ZnO-2P_2O_5)-10 wt% (ZrO_2-1.6P_2O_5) hybrid electrolyte were much smaller than those for the ZrO_2-1.6P_2O_5 electrolyte. This was suggested to be attributed to the effect of covering for the ZrO_2-1.6P_2O_5 electrolyte with ZnO-2P_2O_5 glass having high water resistance and gas barrier properties.
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Technical report of IEICE. OME, 113(358) 7-12, Dec 17, 2013Non-platinum oxygen reduction catalysts made from iron cobalt complexes with pyridyl ligands as precursors supported on multi-wall carbon nanotubes were synthesized by heat treatment with ammonia atmospheres. The mechanism of oxygen reduction for the catalysts was investigated by X-ray photoelectron spectroscopy and a rotating ring disk electrode method. The correlation coefficients between effective nitrogen chemical species on the surface of the oxygen reduction catalysts and cathodic current derived from oxygen reduction reaction or 4-electron reduction efficiency were estimated at each potential. It is clarified that the effective nitrogen chemical species depend on the kinds of ligands used in the precursors. The quaternary-type nitrogen species was effective when using 1, 10-phenanthroline as ligands, whereas the pyridine-type nitrogen species was effective when using 2,2'-bipyridine as ligands.
Books and Other Publications
31Presentations
590Research Projects
47-
科学研究費, 日本学術振興会, Apr, 2024 - Mar, 2027
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革新型蓄電池事業（RISING II）, NEDO, 2016 - 2022
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先端的低炭素化技術開発事業（ALCA）, JST, 2014 - 2022
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Apr, 2018
Industrial Property Rights
9
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