Gas diffusion electrodes containing sulfonated poly (arylene ether) ionomer for polymer electrolyte fuel cells. Part 2. Improvement of the cathode performance

Takeshi Yoda, Takuya Shimura, Byungchan Bae, Kenji Miyatake, Makoto Uchida, Hiroyuki Uchida, Masahiro Watanabe*

*この研究の対応する著者

研究成果: Article査読

20 被引用数 (Scopus)

抄録

The performances of gas diffusion electrodes (GDEs) containing Pt/C catalyst (48 wt.% and 68 wt.%-Pt) and sulfonated poly (arylene ether) (SPAE) ionomer (ion exchange capacity, IEC = 1.8 and 2.5 meq g-1) as a proton-conducting binder (SPAE-GDE) were examined in a PEFC at 80 °C and relative humidities (RH) from 60% to 100%. Based on our analyses in Part 1, we have succeeded in improving the cathode performance over the whole range of current densities examined by using a high Pt-loading for the catalyst (68 wt.%-Pt/C), in place of the previously used 48 wt.% one, for the reduction of thickness of the catalyst layer, which enabled us to increase the O2 gas diffusion rate and to suppress the adsorption of the SPAE binder on the Pt surface via an effective utilization of generated water. The performance, especially at low RH, was improved further by employing an SPAE binder with a lower IEC, 1.8 meq g-1 [SPAE(1.8)]. It was demonstrated by cyclic voltammetry that the specific adsorption of the sulfonate or organic moiety on the Pt surface was indeed suppressed for the case of SPAE(1.8). Hence, for the SPAE-GDEs, the use of a high Pt-loading catalyst, together with a binder with an appropriate IEC, is very important.

本文言語English
ページ(範囲)3464-3470
ページ数7
ジャーナルElectrochimica Acta
55
10
DOI
出版ステータスPublished - 2010 4月 1
外部発表はい

ASJC Scopus subject areas

  • 化学工学(全般)
  • 電気化学

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