Naoki Uehara | Researchain

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Featured researches published by Naoki Uehara.

Journal of Materials Chemistry | 2015

Nano-TaOxNy particles synthesized from oxy-tantalum phthalocyanine: how to prepare precursors to enhance the oxygen reduction reaction activity after ammonia pyrolysis?

Mitsuharu Chisaka; Akimitsu Ishihara; Naoki Uehara; Masashi Matsumoto; Hideto Imai; K. Ota

Nano-TaOxNy oxygen reduction reaction (ORR) catalysts were supported on multi-walled carbon nanotubes (MWCNTs) using two-step pyrolysis of oxy-tantalum phthalocyanine (TaOPc). For the first time, slightly oxidized Ta3N5 has been experimentally proposed to be ORR active in acidic media.

Electrochimica Acta | 2015

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

Naoki Uehara; Akimitsu Ishihara; Masashi Matsumoto; Hideto Imai; Yuji Kohno; Koichi Matsuzawa; Shigenori Mitsushima; Ken Ichiro Ota

Electrochimica Acta | 2015

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

Naoki Uehara; Akimitsu Ishihara; Takaaki Nagai; Masashi Matsumoto; Hideto Imai; Yuji Kohno; Koichi Matsuzawa; Shigenori Mitsushima; K. Ota

224th ECS Meeting (October 27 – November 1, 2013) | 2013

Improving ORR Activity of Group 4 and 5 Metal Oxide-Based Cathodes for PEFCs

Akimitsu Ishihara; Shihong Yin; Kazuaki Suito; Naoki Uehara; Yuji Kohno; Koichi Matsuzawa; Shigenori Mitsushima; Mitsuharu Chisaka; Yoshiro Ohgi; Masashi Matsumoto; Hideto Imai; Ken Ichiro Ota

Journal of Materials Chemistry | 2015

Nano-TaO x N y particles synthesized from oxy-tantalum phthalocyanine

Mitsuharu Chisaka; Akimitsu Ishihara; Naoki Uehara; Masashi Matsumoto; Hideto Imai; Ken Ichiro Ota

224th ECS Meeting (October 27 – November 1, 2013) | 2013

Activity of Tantalum Oxide-Based Electrocatalysts toward Oxygen Reduction Reaction for PEFC

Naoki Uehara; Akimitsu Ishihara; Yuji Kohno; Koichi Matsuzawa; Shigenori Mitsushima; Ken Ichiro Ota

Symposium on Polymer Electrolyte Fuel Cells 15, PEFC 2015 - 228th ECS Meeting | 2015

Oxygen Reduction Durability and Activity of Tantalum Oxide-Based Electrocatalysts for Cathode of Polymer Electrolyte Fuel Cells

Koichi Matsuzawa; Akimitsu Ishihara; Naoki Uehara; Yoshio Fujita; Yuji Kohno; Masashi Matsumoto; Yoshiro Ohgi; Shigenori Mitsushima; Hideto Imai; Ken Ichro Ota

Symposium on Oxygen Reduction Reactions - 2014 ECS and SMEQ Joint International Meeting | 2015

Oxide-Based Electrocatalysts toward Oxygen Reduction Reaction as Non Pt Cathodes for PEFC

Naoki Uehara; Akimitsu Ishihara; Hideto Imai; Masashi Matsumoto; Masazumi Arao; Yoshiro Ohgi; Yuji Kohno; Koichi Matsuzawa; Shigenori Mitsushima; Ken Ichiro Ota

228th ECS Meeting (October 11-15, 2015) | 2015

Active Sites for Oxygen Reduction Reaction in Tantalum Oxynitride Nanoparticles on Multi-Walled Carbon Nanotubes Synthesized Using Ammonia Pyrolysis

Mitsuharu Chisaka; Akimitsu Ishihara; Naoki Uehara; Kenichiro Ota

2014 ECS and SMEQ Joint International Meeting (October 5-9, 2014) | 2014

Oxygen Reduction Reaction Sites and Electron Conduction Mechanism of Zr-Oxide-Based Catalyst:Soft X-Ray SR-XPS and First-Principles Calculations

Masato Mogi; Kei Kubobuchi; Masashi Matsumoto; Toshihiro Asada; Yohei Takahashi; Masazumi Arao; Kazuhiro Kamiguchi; Akimitsu Ishihara; Naoki Uehara; Kenichiro Ota; Teruyasu Mizoguchi; Koichiro Yaji; Ayumi Harasawa; Hideto Imai

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