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Research Output 1993 2016

  • 2025 Citations
  • 26 h-Index
  • 63 Article
  • 47 Conference contribution
  • 3 Chapter
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Article
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

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
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
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
2013
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
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
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
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
2012
29 Citations

Oxygen reduction reaction on tantalum oxide-based catalysts prepared from TaC and TaN

Ohgi, Y., Ishihara, A., Matsuzawa, K., Mitsushima, S., Ota, K. I., Matsumoto, M. & Imai, H. 2012 Apr 30 In : Electrochimica Acta. 68, p. 192-197 6 p.

Research output: Contribution to journalArticle

Oxygen
Tantalum carbide
Nitrides
Oxidation
Tantalum oxides
2011
23 Citations

Carbon nanowalls as platinum support for fuel cells

Chul Shin, S., Yoshimura, A., Matsuo, T., Mori, M., Tanimura, M., Ishihara, A., Ota, K. I. & Tachibana, M. 2011 Nov 15 In : Journal of Applied Physics. 110, 10, 104308

Research output: Contribution to journalArticle

Catalyst supports
Platinum
Nanoparticles
Carbon
Electronic properties
2 Citations
Oxygen
Catalyst activity
Reactive sputtering
Tantalum oxides
Tantalum
1 Citations

Catalytic activity for oxygen reduction reaction on tantalum oxide-based compounds (2) active sites of taon thin film catalysts and role of carbon

Ishihara, A., Kikuchi, A., Ohgi, Y., Matsuzawa, K., Mitsushima, S., Ota, K. I., Matsumoto, M. & Imai, H. 2011 Oct 1 In : Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 75, 10, p. 552-556 5 p.

Research output: Contribution to journalArticle

Oxygen
Carbon
Nitrogen
Adsorption
Thin films
32 Citations

Development of group 4 and 5 metal oxide-based cathodes for polymer electrolyte fuel cell

Ota, K. I., Ohgi, Y., Nam, K. D., Matsuzawa, K., Mitsushima, S. & Ishihara, A. 2011 Jun 15 In : Journal of Power Sources. 196, 12, p. 5256-5263 8 p.

Research output: Contribution to journalArticle

Carbon nitride
Oxides
Oxygen
Defects
Ionization potential
9 Citations
Oxygen
Catalyst activity
Carbon nitride
Tantalum
Fuel cells
1 Citations

Pt-Ir-SnO 2/C electrocatalysts for ethanol oxidation in acidic media

Zhao, L., Mitsushima, S., Ishihara, A., Matsuzawa, K. & Ota, K. I. 2011 Dec 1 In : Cuihua Xuebao/Chinese Journal of Catalysis. 32, 12, p. 1856-1863 8 p.

Research output: Contribution to journalArticle

Catalysts
Ethanol
Oxidation
Direct ethanol fuel cells (DEFC)
Catalyst selectivity
6 Citations

Pt-Ir-SnO 2/C electrocatalysts for ethanol oxidation in acidic media

Zhao, L., Mitsushima, S., Ishihara, A., Matsuzawa, K. & Ota, K. I. 2011 Nov 1 In : Chinese Journal of Catalysis. 32, 11-12, p. 1856-1863 8 p.

Research output: Contribution to journalArticle

Catalysts
Ethanol
Oxidation
Direct ethanol fuel cells (DEFC)
Catalyst selectivity
1 Citations

Quantitative analysis of electrooxidation products on platinum for direct ethanol fuel cell

Matsuzawa, K., Takahashi, T., Ishihara, A., Mitsushima, S. & Ota, K. I. 2011 May 1 In : Electrochemistry. 79, 5, p. 419-423 5 p.

Research output: Contribution to journalArticle

Electrooxidation
Direct ethanol fuel cells (DEFC)
Byproducts
Platinum
Chemical analysis
4 Citations

Zirconium oxide-based compounds as non-Pt cathode for polymer electrolyte fuel cell

Ukita, K., Ishihara, A., Ohgi, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2011 May 1 In : Electrochemistry. 79, 5, p. 340-342 3 p.

Research output: Contribution to journalArticle

Zirconia
Oxygen
Fuel cells
Cathodes
Thermodynamic properties
2010
4 Citations

Hydrogen energy system and environmental impact factor

Ota, K. I., Ishihara, A., Matsuzawa, K. & Mitsushima, S. 2010 Dec 1 In : Electrochemistry. 78, 12, p. 970-975 6 p.

Research output: Contribution to journalArticle

Environmental impact
Hydrogen
Carbon
Water
Earth (planet)
25 Citations
Oxygen
Zirconia
Ionization potential
Thermodynamic properties
Catalysts
26 Citations

Partially oxidized niobium carbonitride as a non-platinum catalyst for the reduction of oxygen in acidic medium

Nam, K. D., Ishihara, A., Matsuzawa, K., Mitsushima, S., Ota, K. I., Matsumoto, M. & Imai, H. 2010 Oct 1 In : Electrochimica Acta. 55, 24, p. 7290-7297 8 p.

Research output: Contribution to journalArticle

Oxygen
Catalysts
X ray absorption spectroscopy
Carbon nitride
Ionization potential
88 Citations

Progress in non-precious metal oxide-based cathode for polymer electrolyte fuel cells

Ishihara, A., Ohgi, Y., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2010 Nov 30 In : Electrochimica Acta. 55, 27, p. 8005-8012 8 p.

Research output: Contribution to journalArticle

Oxides
Oxygen
Cathodes
Catalysts
Metals
29 Citations
Oxygen
Defects
Electrons
Absorption spectroscopy
X rays
62 Citations

Tantalum oxide-based compounds as new non-noble cathodes for polymer electrolyte fuel cell

Ishihara, A., Tamura, M., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2010 Nov 1 In : Electrochimica Acta. 55, 26, p. 7581-7589 9 p.

Research output: Contribution to journalArticle

Oxygen
Tantalum
Tantalum oxides
Fuel cells
Catalyst activity
46 Citations

Zirconium oxide-based compound as new cathode without platinum group metals for PEFC

Ohgi, Y., Ishihara, A., Matsuzawa, K., Mitsushima, S. & Ota, K. 2010 Nov 1 In : Journal of the Electrochemical Society. 157, 6

Research output: Contribution to journalArticle

Carbon nitride
Zirconium
Oxygen
Fuel cells
Cathodes
2009
17 Citations

Partially oxidized niobium carbonitride as non-platinum cathode for PEFC

Nam, K. D., Ishihara, A., Matsuzawa, K., Mitsushima, S. & Ota, K. I. 2009 Sep 18 In : Electrochemical and Solid-State Letters. 12, 11

Research output: Contribution to journalArticle

Carbon nitride
Niobium
Fuel cells
Catalyst activity
Cathodes
2008
36 Citations

Catalytic activity of partially oxidized transition-metal carbide-nitride for oxygen reduction reaction in sulfuric acid

Ohgi, Y., Ishihara, A., Shibata, Y., Mitsushima, S. & Ota, K. I. 2008 Jun 5 In : Chemistry Letters. 37, 6, p. 608-609 2 p.

Research output: Contribution to journalArticle

Transition metals
Nitrides
Carbides
Catalyst activity
Catalysts
49 Citations
Oxygen
Catalyst activity
Reactive sputtering
Sulfuric acid
Zirconium
66 Citations

Partially oxidized tantalum carbonitrides as a new nonplatinum cathode for PEFC-1-

Ishihara, A., Shibata, Y., Mitsushima, S. & Ota, K. 2008 Mar 14 In : Journal of the Electrochemical Society. 155, 4

Research output: Contribution to journalArticle

Oxygen
Catalyst activity
Fuel cells
Cathodes
Electrolytes
88 Citations

Tantalum (oxy)nitrides prepared using reactive sputtering for new nonplatinum cathodes of polymer electrolyte fuel cell

Ishihara, A., Doi, S., Mitsushima, S. & Ota, K. I. 2008 Jun 30 In : Electrochimica Acta. 53, 16, p. 5442-5450 9 p.

Research output: Contribution to journalArticle

Oxygen
Substrates
Temperature
Catalyst activity
Ionization potential
2007
158 Citations

Catalytic activity of titanium oxide for oxygen reduction reaction as a non-platinum catalyst for PEFC

Kim, J. H., Ishihara, A., Mitsushima, S., Kamiya, N. & Ota, K. I. 2007 Feb 1 In : Electrochimica Acta. 52, 7, p. 2492-2497 6 p.

Research output: Contribution to journalArticle

Catalysts
Oxygen
Catalyst activity
Titanium oxides
Fuel cells
36 Citations
Oxygen
Catalyst activity
Heat treatment
Temperature
Chemical stability
45 Citations

Effect of tin oxides on oxide formation and reduction of platinum particles

Nakada, M., Ishihara, A., Mitsushima, S., Kamiya, N. & Ota, K. I. 2007 Jan 1 In : Electrochemical and Solid-State Letters. 10, 1, 028701ESL

Research output: Contribution to journalArticle

Platinum
Oxides
Hydrogen
Desorption
Tin oxides
29 Citations

New non-platinum cathode based on chromium for PEFC

Kim, J. H., Ishihara, A., Mitsushima, S., Kamiya, N. & Ota, K. I. 2007 Apr 5 In : Chemistry Letters. 36, 4, p. 514-515 2 p.

Research output: Contribution to journalArticle

Fuel cells
Chromium
Catalyst activity
Cathodes
Electrolytes
35 Citations

Oxygen reduction reaction of Ta-C-N prepared by reactive sputtering with heat treatment

Kim, J. H., Ishihara, A., Mitsushima, S., Kamiya, N. & Ota, K. I. 2007 Feb 1 In : Electrochemistry. 75, 2, p. 166-168 3 p.

Research output: Contribution to journalArticle

Heat treatment
Temperature
Catalyst activity
Oxygen
Electrocatalysts
38 Citations

Sulfated-zirconia as a support of Pt catalyst for polymer electrolyte fuel cells

Suzuki, Y., Ishihara, A., Mitsushima, S., Kamiya, N. & Ota, K. I. 2007 May 21 In : Electrochemical and Solid-State Letters. 10, 7

Research output: Contribution to journalArticle

Cathodes
Catalysts
Catalyst supports
Zirconia
Fuel cells
79 Citations

Transition metal oxides as DMFC cathodes without platinum

Liu, Y., Ishihara, A., Mitsushima, S., Kamiya, N. & Ota, K. I. 2007 Jun 11 In : Journal of the Electrochemical Society. 154, 7

Research output: Contribution to journalArticle

Oxides
Oxygen
Metals
Transition metals
Cathodes
75 Citations

Zirconium-based compounds for cathode of polymer electrolyte fuel cell

Doi, S., Ishihara, A., Mitsushima, S., Kamiya, N. & Ota, K. I. 2007 Feb 19 In : Journal of the Electrochemical Society. 154, 3

Research output: Contribution to journalArticle

Oxygen
Catalyst activity
Substrates
Ionization potential
Zirconium
2006

Electrode materials for polymer electrolyte fuel cells

Ota, K. I. & Ishihara, A. 2006 In : IEEJ Transactions on Fundamentals and Materials. 126, 10, p. 951-954 4 p.

Research output: Contribution to journalArticle

Fuel cells
Cathodes
Electrolytes
Catalysts
Polymers
197 Citations

Methanol-tolerant oxygen reduction electrocatalysts based on Pd-3D transition metal alloys for direct methanol fuel cells

Lee, K., Savadogo, O., Ishihara, A., Mitsushima, S., Kamiya, N. & Ota, K. I. 2006 Apr 10 In : Journal of the Electrochemical Society. 153, 1

Research output: Contribution to journalArticle

Oxygen
Electrocatalysts
Methanol
Direct methanol fuel cells (DMFC)
Transition metal alloys
2005
30 Citations

Improvement of cathode materials for polymer electrolyte fuel cell

Ota, K. I., Ishihara, A., Mitsushima, S., Lee, K., Suzuki, Y., Horibe, N., Nakagawa, T. & Kamiya, N. 2005 Jan 1 In : Journal of New Materials for Electrochemical Systems. 8, 1, p. 25-35 11 p.

Research output: Contribution to journalArticle

Exergy
Catalyst activity
Cathodes
Fuel cells
Electrolytes