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

Davies, J. C. LU ; Nielsen, R. M. ; Thomsen, L. B. ; Chorkendorff, I. ; Logadóttir, Á ; Lodziana, Z. ; Nørskov, J. K. ; Li, W. X. LU ; Hammer, B. and Longwitz, S. R. , et al. (2004) In Fuel Cells 4(4). p.309-319
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... (More)

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.

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publishing date
type
Contribution to journal
publication status
published
keywords
Co-Tolerance, Ligand Effect, PEM Fuel Cell, Platinum, Ruthenium
in
Fuel Cells
volume
4
issue
4
pages
11 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:19944427546
ISSN
1615-6846
DOI
10.1002/fuce.200400046
language
English
LU publication?
no
id
005b204d-03c4-4211-b2d0-db63ad8f0b8e
date added to LUP
2018-08-07 22:12:06
date last changed
2022-04-02 01:26:11
@article{005b204d-03c4-4211-b2d0-db63ad8f0b8e,
  abstract     = {{<p>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 <sub>co</sub>) in argon. A linear dependence of In(k) with In(p<sub>co</sub>) 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.</p>}},
  author       = {{Davies, J. C. and Nielsen, R. M. and Thomsen, L. B. and Chorkendorff, I. and Logadóttir, Á and Lodziana, Z. and Nørskov, J. K. and Li, W. X. and Hammer, B. and Longwitz, S. R. and Schnadt, J. and Vestergaard, E. K. and Vang, R. T. and Besenbacher, F.}},
  issn         = {{1615-6846}},
  keywords     = {{Co-Tolerance; Ligand Effect; PEM Fuel Cell; Platinum; Ruthenium}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{4}},
  pages        = {{309--319}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Fuel Cells}},
  title        = {{CO desorption rate dependence on CO partial pressure over platinum fuel cell catalysts}},
  url          = {{http://dx.doi.org/10.1002/fuce.200400046}},
  doi          = {{10.1002/fuce.200400046}},
  volume       = {{4}},
  year         = {{2004}},
}