An advanced gas diffusion electrode for high performance phosphoric acid fuel cells

被引:9
作者
Hara, N
Tsurumi, K
Watanabe, M
机构
[1] YAMANASHI UNIV,LAB ELECTROCHEM ENERGY CONVERS,KOFU,YAMANASHI 400,JAPAN
[2] TANAKA KIKINZOKU KOGYO TECH CTR,HIRATSUKA,KANAGAWA 254,JAPAN
来源
JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1996年 / 413卷 / 1-2期
关键词
Gas diffusion electrode; Phosphoric acid fuel cells;
D O I
10.1016/0022-0728(94)03597-0
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
An extremely thin fluorinated polyethylene (FPE) film was prepared on a carbon black (CB) surface and the properties were studied. It was found that polyethylene as the precursor can cover the whole surface of the CB particles with a thin film different from the conventional Teflon dispersion (PTFE), and it can be fluorinated easily to produce a Teflon-like hydrophobic material. The resulting FPE/CB material showed a distinctive hydrophobic property and a comparable thermal stability compared with PTFE under the operating conditions for phosphoric acid fuel cells (PAFCs). An advanced gas diffusion electrode for PAFCs is proposed in which a new design concept of the electrode structure is applied where the functions of electrolyte network and gas network are assigned completely to catalyzed CB and FPE/CB. The cathode optimized in the structure with the new FPE/CB exhibited a high performance for oxygen reduction compared with cathodes using conventional PTFE owing to the improved catalyst utilization and gas permeability, and showed a potential for long operational life owing to less performance degradation resulting from the prevention of flooding of the gas network with electrolyte during operation.
引用
收藏
页码:81 / 88
页数:8
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