CO desorption rate dependence on CO partial pressure over platinum fuel cell catalysts

J. C. Davies, R. M. Nielsen, L. B. Thomsen, I. Chorkendorff, Á Logadóttir, Z. Lodziana, J. K. Nørskov, W. X. Li, B. Hammer, S. R. Longwitz, J. Schnadt, E. K. Vestergaard, R. T. Vang, F. Besenbacher

Research output: Contribution to journalArticlepeer-review

Abstract

Carbon monoxide adsorption on high area platinum fuel cell catalysts was investigated. Isotopic exchange experiments were performed to determine the exchange rate (k) of CO under different partial pressures of CO (p co) in argon. A linear dependence of In(k) with In(pco) was observed. This pressure dependence of the rate of exchange is explained by considering a change in surface coverage of CO with different CO pressures and a subsequent reduction in the CO binding energy as demonstrated by Density Functional Theory (DFT) calculations. High Pressure Scanning Tunneling Microscopy (HP STM) studies on the Pt(111) surface have also displayed a pressure dependency of the coverage consistent with this data. The relevance of these observations to the Polymer Electrolyte Membrane Fuel Cell (PEMFC) anode reaction is discussed.

Original languageEnglish
Pages (from-to)309-319
Number of pages11
JournalFuel Cells
Volume4
Issue number4
DOIs
Publication statusPublished - 2004 Dec 1
Externally publishedYes

Keywords

  • Co-Tolerance
  • Ligand Effect
  • PEM Fuel Cell
  • Platinum
  • Ruthenium

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