| Intrinsic activity and poisoning rate for HCOOH oxidation at Pt(100) and vicinal surfaces containing monoatomic (111) steps. | |
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MedLine Citation:
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PMID: 19569091 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Pulsed voltammetry is used to study formic acid oxidation on Pt(2n-1,1,1) surfaces and determine the effects of the size of the (100) terrace and the (111) step density on the reaction mechanism. The intrinsic activity of the electrode through the active intermediate reaction path (j(theta=) (0)), as well as the rate constant for the CO formation (k(ads)), are calculated from the current transients obtained at different potentials. For surfaces with wide terraces, j(theta=) (0) and k(ads) are almost insensitive to the step density, which suggests that step and terrace sites have a similar activity for this reaction. For narrow terraces (n<6), the intrinsic activity diminishes. The dependence of the reaction rates on the electrode potential is also elucidated. The CO formation only takes place in a narrow potential window, very close to the potential of zero total charge, while the direct oxidation takes place even when the surface is covered by anions. The different behavior for both reactions suggests that the adsorption mode of formic acid is different for each path. |
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Authors:
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Vitali Grozovski; Víctor Climent; Enrique Herrero; Juan M Feliu |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Chemphyschem : a European journal of chemical physics and physical chemistry Volume: 10 ISSN: 1439-7641 ISO Abbreviation: Chemphyschem Publication Date: 2009 Aug |
Date Detail:
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Created Date: 2009-08-03 Completed Date: 2009-10-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100954211 Medline TA: Chemphyschem Country: Germany |
Other Details:
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Languages: eng Pagination: 1922-6 Citation Subset: - |
Affiliation:
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Instituto de Electroquímica, Universidad de Alicante, Apdo. 99, E-03080, Alicante, Spain. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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