Titanium-Niobium Oxides as Non-Noble Metal Cathodes for Polymer Electrolyte Fuel Cells

Catalysts

卷:5

Mitsuharu Chisaka¹  Yuji Kohno²  Yuko Tamura²  Koichi Matsuzawa²  Ken-ichiro Ota²  Shigenori Mitsushima³  Akimitsu Ishihara³  Yoshiro Ohgi⁴ 

[1] Department of Electronics and Information Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan;

[2] Green Hydrogen Research Center, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;

[3] Institute of Advanced Sciences, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan;

[4] Kumamoto Industrial Research Institute, 3-11-38 Azuma-cho, Azuma-ku, Kumamoto,Kumamoto 862-0901, Japan;

关键词: titanium-niobium oxides;    oxygen reduction reaction;    polymer electrolyte fuel cells;    non-platinum cathode;   

DOI  :  10.3390/catal5031289

来源: DOAJ

【 摘 要 】

In order to develop noble-metal- and carbon-free cathodes, titanium-niobium oxides were prepared as active materials for oxide-based cathodes and the factors affecting the oxygen reduction reaction (ORR) activity were evaluated. The high concentrationsol-gel method was employed to prepare the precursor. Heat treatment in Ar containing 4% H2 at 700–900 °C was effective for conferring ORR activity to the oxide. Notably,the onset potential for the ORR of the catalyst prepared at 700 °C was approximately 1.0 V vs. RHE, resulting in high quality active sites for the ORR. X-ray (diffraction and photoelectron spectroscopic) analyses and ionization potential measurements suggested that localized electronic energy levels were produced via heat treatment under reductive atmosphere. Adsorption of oxygen molecules on the oxide may be governed bythe localized electronic energy levels produced by the valence changes induced by substitutional metal ions and/or oxygen vacancies.

【 授权许可】

Unknown