期刊
JOURNAL OF POWER SOURCES
卷 315, 期 -, 页码 179-191出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.02.091
关键词
Carbon-supported Pt catalysts; Effective Pt surface area; Pore structure; Ionomer distribution; Polymer electrolyte fuel cells
资金
- New Energy and Industrial Technology Development Organization (NEDO) of Japan
We investigate the effects of the carbon supports on the Pt distribution, ionomer coverage and cathode performance of carbon-supported Pt catalysts, by using STEM observation, N-2 adsorption analysis and electrochemical characterization. According to the STEM observation, the effective Pt surface area (S(e)(Pt)), which is determined by the location and size of the Pt particles on the supports, increases in the following order: c-Pt/CB < c-Pt/GCB < n-Pt/AB800 < n-Pt/AB250. The N-2 adsorption analyses show that the Pt particles observed in the interior of the CB and AB800-supported Pt catalysts during the STEM observation could be ascribed to the hollow structures inside the carbon supports, which decrease their effective Pt surface areas. The S(e)(Pt) values are in good agreement with the cell performance in the high current density region. In spite of the highest Pt utilization (U-Pt) value (>90%) and uniform ionomer coverage, the c-Pt/CB catalyst shows the lowest cell performance due to the lower S(e)(Pt) value. On the other hand, the n-Pt/AB250 catalyst, for which all of the Pt particles exist only on the exterior surface, is found to be the most attractive in order to generate the large current densities required by actual fuel cell operation. (C) 2016 The Authors. Published by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据