Assessment of CO-tolerance for different Pt-alloy anode catalysts in a polymer electrolyte fuel cell using ac impedance spectroscopy

Yong Jun Leng, Xin Wang, I. Ming Hsing

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

Assessment of CO-tolerance for different anode catalysts (Pt/C, PtRu/C and PtSn/C) at 50°C and PtRu/C at different operating temperatures in the polymer electrolyte fuel cell (PEFC) was evaluated using ac impedance spectroscopy. Impedance measurements for the oxidation of a H2+2% CO mixture reported that at a critical potential (referred to as the onset potential), 'pseudo-inductive' behavior appears, the value of which is different for different anode catalysts (0.70, 0.45 and 0.30 V for Pt/C, PtRu/C and PtSn/C at 50°C, respectively) and strongly dependent upon working temperatures (0.50, 0.45 and 0.40 V for PtRu/C at 25, 50 and 70°C, respectively). Based on that, we proposed that this onset potential for the 'pseudo-inductive' behavior can be used as a new criterion for the evaluation of CO-tolerance for different anode catalysts at different operating temperatures.

Original languageEnglish (US)
Pages (from-to)145-152
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume528
Issue number1-2
DOIs
StatePublished - Jun 14 2002

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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