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Title: Electrochemical CO Oxidation at Platinum on Carbon Studied through Analysis of Anomalous in Situ IR Spectra.
Authors: McPherson, IJ
Ash, PA
Jones, L
Varambhia, A
Jacobs, RMJ
Vincent, KA
First Published: 24-Jul-2017
Publisher: American Chemical Society
Citation: Journal of Physical Chemistry C, 2017, 121 (32), pp. 17176-17187
Abstract: The oxidation of adsorbed CO is a key reaction in electrocatalysis. It has been studied extensively on both extended model surfaces and on nanoparticles; however, correlation between the two is far from simple. Molecular insight into the reaction is often provided using in situ IR spectroscopy; however, practical challenges mean in situ studies on nanoparticles have yet to provide the same level of detail as those on model surfaces. Here we use a new approach to in situ IR spectroscopy to study the mechanism of CO adlayer oxidation on a commercial carbon-supported Pt catalyst. We observe bipolar IR absorption bands but develop a simple model to enable fitting. Quantitative analysis of band behavior during the oxidation prepeak using the model agrees well with previous analysis based on conventional absorption bands. A second linear CO band is observed during the main oxidation region and is assigned to the distinct contribution of CO on step as opposed to terrace sites. Analysis of the step and terrace CO bands during oxidation shows that oxidation begins on the terraces of the nanoparticles before CO on steps is removed. Further correlation of this behavior with the current shows that step CO is only lost in the first of the two main oxidation peaks.
DOI Link: 10.1021/acs.jpcc.7b02166
ISSN: 1932-7447
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2017, American Chemical Society. Deposited with reference to the publisher’s open access archiving policy. (
Description: The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.7b02166. Additional STEM images, detailed peak fits, table of reported peak positions, cyclic voltammograms and spectra used for calibration, and detailed fitted parameters (PDF)
Appears in Collections:Published Articles, Dept. of Chemistry

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