Huang, H, Hayes, ETC, Gianolio, D et al. (4 more authors) (2021) Role of SnO2 in the Bifunctional Mechanism of CO Oxidation at Pt-SnO2 Electrocatalysts. ChemElectroChem, 8 (13). pp. 2572-2582. ISSN 2196-0216
Abstract
Pt-Sn bimetallic catalysts, especially Pt-Sn alloys, are considered highly CO-tolerant and are thus candidates for reformate derived hydrogen oxidation and for direct oxidation of fuel cell molecules. However, it remains unclear if this CO-tolerance originates from Sn in the Pt-Sn alloy or whether SnO2, present as a separate phase, also contributes. In this work, a carbon-supported Pt-SnO2 was carefully synthesized to avoid the formation of Pt-Sn alloy phases. The resulting structure was analysed by scanning transmission electron microscopy (STEM) and detailed X-ray absorption spectroscopy (XAS). CO oxidation voltammograms of the Pt-SnO2/C and other SnO2-modified Pt surfaces unambiguously suggest that a bifunctional mechanism is indeed operative at such Pt-SnO2 catalysts for stable CO oxidation at low overpotentials. The results from these studies suggest that the bifunctional mechanism can be attributed to the co-catalysis role of SnO2, in which the surface hydroxide of SnO2 (Sn-OH) reacts with CO adsorbed on Pt surface (Pt-COads) and regenerates via a SnII/SnIV reversible redox couple (−0.2–0.3 V vs. reversible hydrogen electrode).
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 Wiley-VCH GmbH. This is the peer reviewed version of the following article: H. Huang, E. T. C. Hayes, D. Gianolio, G. Cibin, F. S. Hage, Q. M. Ramasse, A. E. Russell, ChemElectroChem 2021, 8, 2572, which has been published in final form at https://doi.org/10.1002/celc.202100642. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
Keywords: | bifunctional mechanism; Pt-SnO2; SnO2; CO oxidation; electrocatalysts |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Aug 2021 09:23 |
Last Modified: | 23 Jun 2022 00:13 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/celc.202100642 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:176815 |