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

作者：Asada T; Arao M; Kubobuchi K; Mogi M; Takahashi Y; Matsumoto M; Ishihara A; Ota K; Imai H^*

来源：Fuel Cells, 2014, 14(5): 769-774.

DOI：10.1002/fuce.201300239

• Electron Diffraction
• Neutron Diffraction
• Non-Platinum Catalysts
• Oxygen-Reduction Catalysts
• Polymer Electrolyte lyte Fuel ells
• Transmission Electron Micrograph

We report the results of high-resolution transmission electron-micropraph (TEM) observation, electron diffraction, and neutron diffraction (ND) measurements, which are sensitive to oxygen-vacancies, for Ta-oxide-based oxygeneduction electrocatalysts used for polymer electrolyte fuel cells (PEFCs). Both TEM and ND results indicate that highly active tantalum oxide (Ta2O5) phase have an incommensuate long-period structure with oxygen vacancies in the oxides, torming three-dimensionally ordered region in he crysal Such corrective oxygen-vacancies might be effective to create better electronic or surface structural features for oxygen reduction reaction.

• 出版日期2014-10