Promotion of the oxidation of carbon monoxide at stepped platinum single-crystal electrodes in alkaline media by lithium and beryllium cations.
The role of alkali cations (Li{sup +}, Na{sup +}, K{sup +}, Cs{sup +}, and Be{sup 2+}) on the blank voltammetric response and the oxidative stripping of carbon monoxide from stepped Pt single-crystal electrodes in alkaline media has been investigated by cyclic voltammetry. A strong influence of the nature of the cation on both the blank voltammetric profile and the CO oxidation is observed and related to the influence of the cation on the specific adsorption of OH on the platinum surface. Especially Li{sup +} and Be{sup 2+} cations markedly affect the adsorption of OH and thereby have a significant promoting effect on CO{sub ads} oxidation. The voltammetric experiments suggest that, on Pt(111), the influence of Li{sup +} (and Be{sup 2+}) is primarily through a weakening of the repulsive interactions between the OH in the OH adlayer, whereas in the presence of steps also, the onset of OH adsorption is at a lower potential, both on steps and on terraces.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); The Netherlands Organization for Scientific Research; European Commission (EC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 1002218
- Report Number(s):
- ANL/MSD/JA-68788; JACSAT; TRN: US201102%%658
- Journal Information:
- J. Am. Chem. Soc., Vol. 132, Issue 2010; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- ENGLISH
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