Self-promotion mechanism for CO electrooxidation on gold

Paramaconi Rodriguez; Nuria Garcia-Araez; M. T M Koper; Paramaconi Rodriguez

doi:10.1039/b926365a

Self-promotion mechanism for CO electrooxidation on gold

Paramaconi Rodriguez^*, Nuria Garcia-Araez, M. T M Koper, Paramaconi Rodriguez

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

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.

Original language	English
Pages (from-to)	9373-9380
Number of pages	8
Journal	Physical Chemistry Chemical Physics
Volume	12
Issue number	32
Early online date	24 Jun 2010
DOIs	https://doi.org/10.1039/b926365a
Publication status	Published - 28 Aug 2010

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Physics and Astronomy(all)

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title = "Self-promotion mechanism for CO electrooxidation on gold",

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.",

author = "Paramaconi Rodriguez and Nuria Garcia-Araez and Koper, {M. T M} and Paramaconi Rodriguez",

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AU - Rodriguez, Paramaconi

AU - Garcia-Araez, Nuria

AU - Koper, M. T M

AU - Rodriguez, Paramaconi

PY - 2010/8/28

Y1 - 2010/8/28

N2 - 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.

AB - 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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Self-promotion mechanism for CO electrooxidation on gold

Abstract

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