Electrochemical Reduction of CO2 on Compositionally Variant Au-Pt Bimetallic Thin Films

Ming Ma, Heine Anton Hansen, Marco Valenti, Zegao Wang, Anping Cao, Mingdong Dong, Wilson A. Smith

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Abstract

The electrocatalytic reduction of CO2 on Au-Pt bimetallic catalysts with different compositions was evaluated, offering a platform for uncovering the correlation between the catalytic activity and the surface composition of bimetallic electrocatalysts. The Au-Pt alloy films were synthesized by a magnetron sputtering co-deposition technique with tunable composition. It was found that the syngas ratio (CO:H2) on the Au-Pt films is able to be tuned by systematically controlling the binary composition. This tunable catalytic selectivity is attributed to the variation of binding strength of COOH and CO intermediates, influenced by the surface electronic structure (d-band center energy) which is linked to the surface composition of the bimetallic films. Notably, a gradual shift of the d-band center away from the Fermi level was observed with increasing Au content, which correspondingly reduces the binding strength of the COOH and CO intermediates, leading to the distinct catalytic activity for the reduction of CO2 on the compositionally variant Au-Pt bimetallic films. In addition, the formation of formic acid in the bimetallic systems at reduced overpotentials and higher yield indicates that synergistic effects can facilitate reaction pathways for products that are not accessible with the individual components.
Original languageEnglish
JournalNano Energy
Volume42
Pages (from-to)51-57
ISSN2211-2855
DOIs
Publication statusPublished - 2017

Cite this

Ma, Ming ; Hansen, Heine Anton ; Valenti, Marco ; Wang, Zegao ; Cao, Anping ; Dong, Mingdong ; Smith, Wilson A. . / Electrochemical Reduction of CO2 on Compositionally Variant Au-Pt Bimetallic Thin Films. In: Nano Energy. 2017 ; Vol. 42. pp. 51-57.
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title = "Electrochemical Reduction of CO2 on Compositionally Variant Au-Pt Bimetallic Thin Films",
abstract = "The electrocatalytic reduction of CO2 on Au-Pt bimetallic catalysts with different compositions was evaluated, offering a platform for uncovering the correlation between the catalytic activity and the surface composition of bimetallic electrocatalysts. The Au-Pt alloy films were synthesized by a magnetron sputtering co-deposition technique with tunable composition. It was found that the syngas ratio (CO:H2) on the Au-Pt films is able to be tuned by systematically controlling the binary composition. This tunable catalytic selectivity is attributed to the variation of binding strength of COOH and CO intermediates, influenced by the surface electronic structure (d-band center energy) which is linked to the surface composition of the bimetallic films. Notably, a gradual shift of the d-band center away from the Fermi level was observed with increasing Au content, which correspondingly reduces the binding strength of the COOH and CO intermediates, leading to the distinct catalytic activity for the reduction of CO2 on the compositionally variant Au-Pt bimetallic films. In addition, the formation of formic acid in the bimetallic systems at reduced overpotentials and higher yield indicates that synergistic effects can facilitate reaction pathways for products that are not accessible with the individual components.",
author = "Ming Ma and Hansen, {Heine Anton} and Marco Valenti and Zegao Wang and Anping Cao and Mingdong Dong and Smith, {Wilson A.}",
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Electrochemical Reduction of CO2 on Compositionally Variant Au-Pt Bimetallic Thin Films. / Ma, Ming; Hansen, Heine Anton; Valenti, Marco ; Wang, Zegao; Cao, Anping ; Dong, Mingdong; Smith, Wilson A. .

In: Nano Energy, Vol. 42, 2017, p. 51-57.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Ma, Ming

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AU - Dong, Mingdong

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AB - The electrocatalytic reduction of CO2 on Au-Pt bimetallic catalysts with different compositions was evaluated, offering a platform for uncovering the correlation between the catalytic activity and the surface composition of bimetallic electrocatalysts. The Au-Pt alloy films were synthesized by a magnetron sputtering co-deposition technique with tunable composition. It was found that the syngas ratio (CO:H2) on the Au-Pt films is able to be tuned by systematically controlling the binary composition. This tunable catalytic selectivity is attributed to the variation of binding strength of COOH and CO intermediates, influenced by the surface electronic structure (d-band center energy) which is linked to the surface composition of the bimetallic films. Notably, a gradual shift of the d-band center away from the Fermi level was observed with increasing Au content, which correspondingly reduces the binding strength of the COOH and CO intermediates, leading to the distinct catalytic activity for the reduction of CO2 on the compositionally variant Au-Pt bimetallic films. In addition, the formation of formic acid in the bimetallic systems at reduced overpotentials and higher yield indicates that synergistic effects can facilitate reaction pathways for products that are not accessible with the individual components.

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