期刊
JOURNAL OF POWER SOURCES
卷 273, 期 -, 页码 136-141出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.09.069
关键词
Electrode catalyst; Oxygen reduction reaction; Fibrous; Carbon; Titania oxynitride
资金
- Advanced Low Carbon Technology Research and Development Program (ALCA), Development of Metal Hydride/Air Secondary Battery of the Japan Science and Technology Agency (JST)
- Research Project A of the Venture Business Laboratory of Oita University
A fibrous catalyst of titania oxynitride and carbon is prepared and its catalytic behavior in the oxygen reduction reaction (ORR) are investigated in both HClO4 and KOH aqueous solutions. TiO2 particles are successfully deposited on activated carbon fibers by a liquid phase deposition technique using (NH4)(2)TiF6 and H3BO3. The catalyst obtained after subsequent ammonia nitridation at 1273 K had a fibrous structure with TiOxNy and TiN components. Interestingly, the product demonstrates catalytic activity for the ORR in not only HClO4 but also KOH aqueous solution. The onset potential in HClO4 solution is assumed to be moderate, at 0.85 V; on the other hand, that in KOH solution is relatively high at 0.95 V. Furthermore, it is considered from the Tafel plot analysis of the KOH solution result that the ORR mechanism follows a peroxide intermediate pathway and the rate-determining step would be a one-electron-transfer reaction to oxygen molecules adsorbed on the active site. (C) 2014 Elsevier B.V. All rights reserved.
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