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2016
1 Citations

Temperature dependence of oxygen reduction mechanism on a titanium oxide-based catalyst made from oxy-titanium tetra-pyrazino-porphyrazine using carbon nano-tubes as support in acidic solution

Hayashi, T., Ishihara, A., Nagai, T., Arao, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2016 Aug 10 In : Electrochimica Acta. 209, p. 1-6 6 p.

Research output: Contribution to journalArticle

Oxygen
Titanium oxides
Electrons
Cathodes
Titanium
4 Citations

Titanium-niobium oxides mixed with Ti4O7 as precious-metal-and carbon-free cathodes for polymer electrolyte fuel cells

Ishihara, A., Hamazaki, M., Arao, M., Matsumoto, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. 2016 In : Journal of the Electrochemical Society. 163, 7, p. F603-F609

Research output: Contribution to journalArticle

Cathodes
Oxides
Oxygen
Precious metals
Fuel cells
2015

Development of group 4 and 5 metal oxide cathode with electron conductive oxide

Ota, K. I., Hamazaki, M., Matsuzawa, K., Mitsushima, S. & Ishihara, A. 2015 ECS Transactions. 17 ed. Electrochemical Society Inc., Vol. 69, p. 13-21 9 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oxides
Oxidation
Electrons
Metals
Metal complexes

Durability of titanium-niobium oxides mixed with ti4o7 as non-preciousand carbon-free cathodes for PEFCs in H2SO4 at 80°C

Hamazaki, M., Ishihara, A., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2015 In : Electrochemistry. 83, 10, p. 817-819 3 p.

Research output: Contribution to journalArticle

Durability
Cathodes
Niobium oxide
Titanium
Carbon
7 Citations

Effect of reheating treatment on oxygen-reduction activity and stability of zirconium oxide-based electrocatalysts prepared from oxy-zirconium phthalocyanine for polymer electrolyte fuel cells

Okada, Y., Ishihara, A., Matsumoto, M., Arao, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. 2015 Jun 11 In : Journal of the Electrochemical Society. 162, 9, p. F959-F964

Research output: Contribution to journalArticle

Oxygen
Temperature
Graphitization
Electrocatalysts
Zirconium
1 Citations

Kinetic study of oxygen reduction reaction in acid solution using titanium oxide-based catalysts prepared from oxy-titanium tetra-pyrazino-porphyrazine

Hayashi, T., Ishihara, A., Uehara, N., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2015 In : Electrochemistry. 83, 10, p. 807-809 3 p.

Research output: Contribution to journalArticle

Oxygen
Titanium oxides
Catalysts
Titanium
Electrocatalysts
3 Citations

Kinetic study of oxygen reduction reaction on tantalum oxide-based electrocatalysts produced from oxy-tantalum phthalocyanines in acidic media

Uehara, N., Ishihara, A., Nagai, T., Matsumoto, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. 2015 Nov 10 In : Electrochimica Acta. 182, p. 789-794 6 p.

Research output: Contribution to journalArticle

Electrons
Reaction rates
Tantalum oxides
Oxygen
Hydrogen peroxide
2 Citations

Nano-TaO<inf>x</inf>N<inf>y</inf> particles synthesized from oxy-tantalum phthalocyanine: How to prepare precursors to enhance the oxygen reduction reaction activity after ammonia pyrolysis?

Chisaka, M., Ishihara, A., Uehara, N., Matsumoto, M., Imai, H. & Ota, K. 2015 Aug 28 In : Journal of Materials Chemistry A. 3, 32, p. 16414-16418 5 p.

Research output: Contribution to journalArticle

Tantalum
Oxygen
Catalyst supports
Carbon nanotubes
Pyrolysis

Oxide-based electrocatalysts toward oxygen reduction reaction as non Pt cathodes for PEFC

Uehara, N., Ishihara, A., Imai, H., Matsumoto, M., Arao, M., Ohgi, Y., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2015 ECS Transactions. 36 ed. Electrochemical Society Inc., Vol. 64, p. 23-31 9 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oxygen
Cathodes
Tantalum oxides
Oxides
Electrocatalysts

Oxygen reduction durability and activity of tantalum oxide-based electrocatalysts for cathode of polymer electrolyte fuel cells

Matsuzawa, K., Ishihara, A., Uehara, N., Fujita, Y., Kohno, Y., Matsumoto, M., Ohgi, Y., Mitsushima, S., Imai, H. & Ota, K. I. 2015 ECS Transactions. 17 ed. Electrochemical Society Inc., Vol. 69, p. 3-12 10 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Tantalum oxides
Durability
Oxygen
Fuel cells
Cathodes
12 Citations

Synthesis of nano-TaOx oxygen reduction reaction catalysts on multi-walled carbon nanotubes connected via a decomposition of oxy-tantalum phthalocyanine

Ishihara, A., Chisaka, M., Ohgi, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. 2015 Mar 28 In : Physical Chemistry Chemical Physics. 17, 12, p. 7643-7647 5 p.

Research output: Contribution to journalArticle

Tantalum
Carbon nanotubes
Oxygen
Nanotubes
Pyrolysis
4 Citations

Tantalum oxide-based electrocatalysts made from oxy-tantalum phthalocyanines as non-platinum cathodes for polymer electrolyte fuel cells

Uehara, N., Ishihara, A., Matsumoto, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. 2015 Oct 10 In : Electrochimica Acta. 179, p. 146-153 8 p.

Research output: Contribution to journalArticle

Oxygen
Cathodes
Tantalum oxides
Current density
Tantalum
3 Citations

Titanium-niobium oxides as non-noble metal cathodes for polymer electrolyte fuel cells

Ishihara, A., Tamura, Y., Chisaka, M., Ohgi, Y., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2015 Jul 17 In : Catalysts. 5, 3, p. 1289-1303 15 p.

Research output: Contribution to journalArticle

Oxygen
Cathodes
Oxides
Niobium oxide
Electron energy levels
2014

Assessing the environmental impact of hydrogen energy production

Ota, K., Mitsushima, S., Matsuzawa, K. & Ishihara, A. 2014 Jul 3 Advances in Hydrogen Production, Storage and Distribution. Elsevier Inc., p. 31-42 12 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Hydrogen
Environmental impact
Energy utilization
Carbon
Water
3 Citations

Determination of Oxygen-Reduction-Reaction Active Sites of Tantalum Oxide-based Cathodes Used for Polymer Electrolyte Fuel Cells

Asada, T., Arao, M., Kubobuchi, K., Mogi, M., Takahashi, Y., Matsumoto, M., Ishihara, A., Ota, K. & Imai, H. 2014 Oct 1 In : Fuel Cells. 14, 5, p. 769-774 6 p.

Research output: Contribution to journalArticle

Oxygen vacancies
Oxygen
Tantalum oxides
Neutron diffraction
Electron diffraction
1 Citations

Enhancement of oxygen reduction activity of titanium nano-oxide-based electrocatalysts for PEFC cathode

Hayashi, T., Ishihara, A., Matsumoto, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. 2014 ECS Transactions. 3 ed. Electrochemical Society Inc., Vol. 64, p. 247-252 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oxygen
Titanium oxides
Titanium
Catalysts
Electrocatalysts
1 Citations

Improvement of the electrocatalytic activity of zirconium oxide-based catalyst for ORR

Okada, Y., Ishihara, A., Arao, M., Matsumoto, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2014 ECS Transactions. 3 ed. Electrochemical Society Inc., Vol. 64, p. 231-238 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oxygen
Electrocatalysts
Zirconia
Chemical stability
Zirconium

Oxide-based electrocatalysts as precious metal and carbon free cathodes for PEFC

Hamazaki, M., Ishihara, A., Arao, M., Matsumoto, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. 2014 ECS Transactions. 3 ed. Electrochemical Society Inc., Vol. 64, p. 239-246 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oxides
Cathodes
Oxygen
Electrocatalysts
Oxygen vacancies
1 Citations

Transition Metal Oxides, Carbides, Nitrides, Oxynitrides, and Carbonitrides for O2 Reduction Reaction Electrocatalysts for Acid PEM Fuel Cells

Ishihara, A., Imai, H. & Ota, K. I. 2014 May 19 Non-Noble Metal Fuel Cell Catalysts. Wiley Blackwell, p. 183-204 22 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Oxygen
Oxides
Catalyst activity
Cathodes
Catalysts
2013
1 Citations

Activity of tantalum oxide-based electrocatalysts toward oxygen reduction reaction for PEFC

Uehara, N., Ishihara, A., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2013 ECS Transactions. 1 ed. Electrochemical Society Inc., Vol. 58, p. 1217-1223 7 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oxygen
Cathodes
Tantalum oxides
Ball milling
Catalyst supports

Advanced study of transition metal oxidebased cathode for PEFCS

Ota, K., Matsuzawa, K., Mitsushima, S. & Ishihara, A. 2013 EFC 2013 - Proceedings of the 5th European Fuel Cell Piero Lunghi Conference. ENEA, p. 71-72 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Cathodes
Oxides
Catalyst activity
Cost reduction
Transition metals
28 Citations

Emergence of oxygen reduction activity in partially oxidized tantalum carbonitrides: Roles of deposited carbon for oxygen-reduction-reaction-site creation and surface electron conduction

Ishihara, A., Tamura, M., Ohgi, Y., Matsumoto, M., Matsuzawa, K., Mitsushima, S., Imai, H. & Ota, K. I. 2013 Sep 19 In : Journal of Physical Chemistry C. 117, 37, p. 18837-18844 8 p.

Research output: Contribution to journalArticle

Oxygen
Carbon nitride
Tantalum
Carbon
Tantalum oxides
4 Citations

Enhancement of oxygen reduction activity of zirconium oxide-based cathode for PEFC

Yin, S., Ishihara, A., Kohno, Y., Matsuzawa, K., Mitsushima, S., Ota, K. I., Matsumoto, M. & Imai, H. 2013 ECS Transactions. 1 ed. Electrochemical Society Inc., Vol. 58, p. 1489-1494 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Oxygen
Zirconium
Cathodes
Protective atmospheres
Voltammetry
19 Citations

Factors for improvements of catalytic activity of zirconium oxide-based oxygen-reduction electrocatalysts

Ohgi, Y., Ishihara, A., Matsuzawa, K., Mitsushima, S., Ota, K. I., Matsumoto, M. & Imai, H. 2013 Apr 2 In : Journal of the Electrochemical Society. 160, 2

Research output: Contribution to journalArticle

Zirconium
Oxygen
Carbon nitride
Oxidation
Carbon
3 Citations

Immersed effects of Ta and Zr compounds on activity of oxygen reduction reaction in sulfuric acid

Matsuzawa, K., Nozawa, K., Yamauchi, K., Ishihara, A., Mitsushima, S. & Ota, K. I. 2013 Mar 15 In : Journal of Power Sources. 226, p. 16-19 4 p.

Research output: Contribution to journalArticle

Sulfuric acid
Oxygen
Catalyst activity
1 Citations

Improving ORR activity of group 4 and 5 metal oxide-based cathodes for PEFCs

Ishihara, A., Yin, S., Suito, K., Uehara, N., Okada, Y., Kohno, Y., Matsuzawa, K., Mitsushima, S., Chisaka, M., Ohgi, Y., Matsumoto, M., Imai, H. & Ota, K. I. 2013 ECS Transactions. 1 ed. Electrochemical Society Inc., Vol. 58, p. 1495-1500 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Cathodes
Oxides
Oxygen
Metals
Nitridation

Metal Oxide-based compounds as electrocatalysts for Oxygen reduction reaction

Ota, K. I. & Ishihara, A. 2013 Lecture Notes in Energy. Vol. 9, p. 391-416 26 p. (Lecture Notes in Energy; vol. 9)

Research output: Chapter in Book/Report/Conference proceedingChapter

Oxides
Oxygen
Catalysts
Platinum
Cathodes

Nano-sized titanium oxides as electrocatalyst for oxygen reduction reaction toward PEFC

Suito, K., Ishihara, A., Hayashi, T., Matsumoto, M., Arao, M., Kohno, Y., Matsuzawa, K., Imai, H., Mitsushima, S. & Ota, K. 2013 ECS Transactions. 47 ed. Electrochemical Society Inc., Vol. 58, p. 1-7 7 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Titanium oxides
Oxygen
Cathodes
Carbon nitride
Electrocatalysts
23 Citations

Oxygen reduction reaction activity of nitrogen-doped titanium oxide in acid media

Chisaka, M., Ishihara, A., Suito, K., Ota, K. I. & Muramoto, H. 2013 Jan 15 In : Electrochimica Acta. 88, p. 697-707 11 p.

Research output: Contribution to journalArticle

Oxygen
Heat treatment
Temperature
Nitrogen
Gases

Stabilization and activation of zirconium oxide based electrocatalysts as PEFC cathode by re-heat treatment

Okada, Y., Ishihara, A., Matsumoto, M., Arao, M., Imai, H., Kohno, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. 2013 ECS Transactions. 1 ed. Electrochemical Society Inc., Vol. 58, p. 1225-1231 7 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electrocatalysts
Zirconia
Durability
Heat treatment
Stabilization
14 Citations

Synthesis of carbon-supported titanium oxynitride nanoparticles as cathode catalyst for polymer electrolyte fuel cells

Chisaka, M., Ishihara, A., Ota, K. I. & Muramoto, H. 2013 Dec 15 In : Electrochimica Acta. 113, p. 735-740 6 p.

Research output: Contribution to journalArticle

Nanoparticles
Carbon
Titanium oxides
Fuel cells
Cathodes
1 Citations

Zirconium oxide-based cathode prepared by partial oxidation of carbonitrides as non-precious metal cathode for polymer electrolyte fuel cells

Ota, K. I., Ohgi, Y., Matsuzawa, K., Mitsushima, S. & Ishihara, A. 2013 Jan 1 ECS Transactions. 12 ed. Electrochemical Society Inc., Vol. 53, p. 1-8 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Carbon nitride
Cathodes
Zirconium
Fuel cells
Electrolytes