Dissolution of platinum catalyst in polymer electrolyte fuel cell

A. P. Yadav, Y. Sugawara, A. Nishikata, T. Tsuru

研究成果: Conference contribution

抄録

Polymer electrolyte fuel cells (PEFC) are expected as an alternate energy conversion source for automobiles and stationary power supplies. However, degradation of the cathode catalyst of platinum is one of the problems for the commercialization of PEFCs. It is well known that platinum catalyst at the cathode of PEFC dissolves into the polymer electrolyte, and then the dissolved platinum ions are reduced by hydrogen gas leaked from the anode. As a result, in polymer electrolytes after long-term operation, a line of deposited platinum particles, the so-called platinum band, is formed. In this study, dissolution of platinum has been investigated in 0.5M H 2SO 4 solution using electrochemical quartz crystal microbalance (EQCM) and ICP-MS. In potentiostatic conditions, platinum dissolved at the highest rate at 1.0 V (vs. SHE). Before 1.0 V, the dissolution started from around 0.80 V and increased with the applied potential. The dissolution was inhibited after 1.0 V by passivation of platinum surface due probably to formation of PtO. Under the potential cycle condition (cyclic voltammetry), the dissolution was enhanced, especially when employed the upper and lower limits of potential cycles where formation and reduction of PtO occur. On the basis of the results, dissolution mechanism of platinum will be discussed.

本文言語English
ホスト出版物のタイトル17th International Corrosion Congress 2008
ホスト出版物のサブタイトルCorrosion Control in the Service of Society
ページ2977-2984
ページ数8
出版ステータスPublished - 2008 12 1
外部発表はい
イベント17th International Corrosion Congress 2008: Corrosion Control in the Service of Society - Las Vegas, NV, United States
継続期間: 2008 10 62008 10 10

出版物シリーズ

名前17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
5

Other

Other17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
国/地域United States
CityLas Vegas, NV
Period08/10/608/10/10

ASJC Scopus subject areas

  • コロイド化学および表面化学
  • 表面、皮膜および薄膜

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