CO ADSORPTION AND OXIDATION ON PT(111) ELECTRODES MODIFIED BY IRREVERSIBLY ADSORBED BISMUTH IN SULFURIC-ACID MEDIUM

Citation
E. Herrero et al., CO ADSORPTION AND OXIDATION ON PT(111) ELECTRODES MODIFIED BY IRREVERSIBLY ADSORBED BISMUTH IN SULFURIC-ACID MEDIUM, Journal of catalysis, 152(2), 1995, pp. 264-274
Citations number
35
Categorie Soggetti
Chemistry Physical
Journal title
ISSN journal
00219517
Volume
152
Issue
2
Year of publication
1995
Pages
264 - 274
Database
ISI
SICI code
0021-9517(1995)152:2<264:CAAOOP>2.0.ZU;2-#
Abstract
CO adsorption and desorption (''stripping'') on Pt(111) electrodes mod ified by irreversibly adsorbed bismuth have been studied. The presence of CO adsorbed on the Bi-Pt(111) electrode modifies the redox peak of the adsorbed bismuth, suggesting the presence of a CO-Bi mixed adlaye r. Using the CO stripping charge after appropriate correction, the val ues of CO coverage for the different bismuth coverages were calculated , as well as the proportions of linear and bridged-bonded CO. Unlike i n UHV environments, the presence of bismuth on the surface favors the linear configuration of the adsorbed CO. At Theta(Bi) = 0.15, the CO p opulation is almost entirely constituted linear CO, regardless of the CO coverage. Transient CO stripping demonstrates that the presence of bismuth on the surface enhances CO oxidation through bismuth-mediated oxygen transfer. (C) 1995 Academic Press, Inc.