Self-promotion mechanism for CO electrooxidation on gold
Self-promotion mechanism for CO electrooxidation on gold
CO electrooxidation on Au(111), Au(100) and Au(110) electrodes in 0.1 M HClO4 and 0.1 M NaOH solutions has been studied by means of voltammetric measurements with hanging meniscus rotating bead-type electrodes . It is found that the reaction order in CO concentration is close to unity at potentials close to the onset of CO oxidation , and then it becomes higher than unity at higher potentials for all studied surfaces except for Au(111) in 0.1 M HClO4. This behavior indicates that CO oxidation on gold takes place through a self-promotion mechanism, in which the presence of CO on the gold surface enhances the adsorption of its own oxidant. Specifically, this mechanism offers a plausible explanation for the higher catalytic activity in alkaline solutions, since CO adsorption is stronger under these conditions, and thus it can lead to a higher enhancement of the adsorption of the oxidant species
9373-9380
Rodriguez, Paramaconi
5a751a4e-490e-42bb-9c22-7b0fc72e9a09
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Koper, Marc T. M.
777e24f0-372f-44df-ab65-12bf097b54e0
2010
Rodriguez, Paramaconi
5a751a4e-490e-42bb-9c22-7b0fc72e9a09
Garcia-Araez, Nuria
9358a0f9-309c-495e-b6bf-da985ad81c37
Koper, Marc T. M.
777e24f0-372f-44df-ab65-12bf097b54e0
Rodriguez, Paramaconi, Garcia-Araez, Nuria and Koper, Marc T. M.
(2010)
Self-promotion mechanism for CO electrooxidation on gold.
Physical Chemistry Chemical Physics, 12 (32), .
(doi:10.1039/B926365A).
(PMID:20577686)
Abstract
CO electrooxidation on Au(111), Au(100) and Au(110) electrodes in 0.1 M HClO4 and 0.1 M NaOH solutions has been studied by means of voltammetric measurements with hanging meniscus rotating bead-type electrodes . It is found that the reaction order in CO concentration is close to unity at potentials close to the onset of CO oxidation , and then it becomes higher than unity at higher potentials for all studied surfaces except for Au(111) in 0.1 M HClO4. This behavior indicates that CO oxidation on gold takes place through a self-promotion mechanism, in which the presence of CO on the gold surface enhances the adsorption of its own oxidant. Specifically, this mechanism offers a plausible explanation for the higher catalytic activity in alkaline solutions, since CO adsorption is stronger under these conditions, and thus it can lead to a higher enhancement of the adsorption of the oxidant species
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Published date: 2010
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Electrochemistry
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Local EPrints ID: 345753
URI: http://eprints.soton.ac.uk/id/eprint/345753
ISSN: 1463-9076
PURE UUID: 65ae07f7-c329-49f3-b81b-6a3402dc0b6a
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Date deposited: 29 Nov 2012 15:20
Last modified: 15 Mar 2024 03:46
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Author:
Paramaconi Rodriguez
Author:
Marc T. M. Koper
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