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Catalysts 2015, 5(3), 1388-1398; doi:10.3390/catal5031388

Sb Surface Modification of Pd by Mimetic Underpotential Deposition for Formic Acid Oxidation

Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, NO. 2588 Changyang Road, Yangpu District, Shanghai 200090, China
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Academic Editor: Minhua Shao
Received: 13 May 2015 / Revised: 22 July 2015 / Accepted: 22 July 2015 / Published: 28 July 2015
(This article belongs to the Special Issue Electrocatalysis in Fuel Cells)
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Abstract

The newly proposed mimetic underpotential deposition (MUPD) technique was extended to modify Pd surfaces with Sb through immersing a Pd film electrode or dispersing Pd/C powder in a Sb(III)-containing solution blended with ascorbic acid (AA). The introduction of AA shifts down the open circuit potential of Pd substrate available to achieve suitable Sb modification. The electrocatalytic activity and long-term stability towards HCOOH electrooxidation of the Sb modified Pd surfaces (film electrode or powder catalyst) by MUPD is superior than that of unmodified Pd and Sb modified Pd surfaces by conventional UPD method. The enhancement of electrocatalytic performance is due to the third body effect and electronic effect, as well as bi-functional mechanism induced by Sb modification which result in increased resistance against CO poisoning. View Full-Text
Keywords: formic acid oxidation; palladium; Sb modification; mimetic underpotential deposition formic acid oxidation; palladium; Sb modification; mimetic underpotential deposition
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, L.-L.; Cao, X.-L.; Wang, Y.-J.; Li, Q.-X. Sb Surface Modification of Pd by Mimetic Underpotential Deposition for Formic Acid Oxidation. Catalysts 2015, 5, 1388-1398.

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