Oxygen electroreduction on gold-cobalt oxide binary nanocluster catalysts

Lin, Hongfei, Tang, Wei, Kleiman-Shwarsctein, Alan and McFarland, Eric W. (2008) Oxygen electroreduction on gold-cobalt oxide binary nanocluster catalysts. Journal of the Electrochemical Society, 155 2: B200-B206. doi:10.1149/1.2818786

Author Lin, Hongfei
Tang, Wei
Kleiman-Shwarsctein, Alan
McFarland, Eric W.
Title Oxygen electroreduction on gold-cobalt oxide binary nanocluster catalysts
Journal name Journal of the Electrochemical Society   Check publisher's open access policy
ISSN 0013-4651
Publication date 2008
Sub-type Article (original research)
DOI 10.1149/1.2818786
Open Access Status
Volume 155
Issue 2
Start page B200
End page B206
Total pages 7
Place of publication Pennington, NJ, United States
Publisher Electrochemical Society
Language eng
Abstract The electroreduction of oxygen was investigated on mixed gold-cobalt oxide (Au CoOx) nanoclusters in potassium hydroxide solution. Au CoOx binary nanoclusters were prepared with different atomic ratios of Au:Co using pulsed-voltage electrodeposition at 20 kHz from electrolytes with varying concentrations of Au and Co cations. The electrocatalytic activities of the different catalysts deposited on rotating disk electrodes were evaluated for the oxygen reduction reaction (ORR) using voltammetry. The Au CoOx binary electrocatalysts with less than 1.2% Co atoms were found to increase the ORR activity compared to those of either the pure Au or pure CoOx. As the Co content in the binary mixture was increased, a maximum in the Au electronegativity, as measured by X-ray photoelectron spectroscopy, was observed which corresponded to a maximum observed rate for oxygen reduction. The Au:Co atomic ratio at the maximum rate was approximately 80:1. The number of electrons transferred in the oxygen reduction decrease from four to two as the Co content increased, suggesting that the electroreduction pathway is altered by the presence of Co.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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