Dissolution of platinum catalyst in polymer electrolyte fuel cell

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication17th International Corrosion Congress 2008
Subtitle of host publicationCorrosion Control in the Service of Society
Pages2977-2984
Number of pages8
Publication statusPublished - 2008 Dec 1
Externally publishedYes
Event17th International Corrosion Congress 2008: Corrosion Control in the Service of Society - Las Vegas, NV, United States
Duration: 2008 Oct 62008 Oct 10

Publication series

Name17th International Corrosion Congress 2008: Corrosion Control in the Service of Society
Volume5

Other

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

Keywords

  • EQCM
  • PEFC
  • Pt dissolution
  • Pt-oxide
  • Redeposition

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Surfaces, Coatings and Films

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