Electrochemical analysis of perpendicular mesoporous Pt electrode filled with pure water for clarifying the active region in fuel cell catalyst layers

JOURNAL OF POWER SOURCES

卷:195

Article

Tominaka, Satoshi²  Wu, Chia-Wen¹  Kuroda, Kazuyuki²  Osaka, Tetsuya² 

[1] Natl Taiwan Univ, Dept Chem Engn, Taipei 106, Taiwan

[2] Waseda Univ, Fac Sci & Engn, Dept Appl Chem, Shinjuku Ku, Tokyo 1698555, Japan

关键词: Fuel cell;    Catalyst layer;    Mesoporous platinum;    Catalyst utilization;    Model electrode;   

DOI  :  10.1016/j.jpowsour.2009.11.002

来源: Elsevier

【 摘 要 】

A perpendicular mesoporous platinum film is used as a model electrode to clarify the effectiveness of catalysts inside agglomerates of fuel cell catalyst layers on the basis of experimental facts. The analysis clarifies that: (i) Pt surface even apart from Nafion ionomer phase can be electrochemically active: (ii) its response is different from that of the surface covered with ionomer; and (iii) ionic resistance in pores filled with pure water is too high (ca. 0.18 M Omega cm) for fuel cell reactions to smoothly occur. We conclude that such catalysts in pores filled with pure water are ineffective for fuel cell reactions due to the high ionic resistance, though their catalytic activity is possibly higher than that of the catalysts covered with Nafion. (C) 2009 Published by Elsevier B.V.

【 授权许可】

Free