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Silver Induced Electronic Drift in AgPd Bimetallics: Rationale for Enhanced Electrocatalytic Activity of Ethanol Oxidation Reaction

Abstract

Motivated by the possible synergistic electronic effect observed in Ag and Pd system, simple galvanic replacement reaction (GRR) is carried out for large scale fabrication of bimetallic AgPd nanoparticles using modified hydrothermal (MHT) technique. The typical galvanic replacement process under MHT drives the evolution process for AgCl free etched AgPd nanostructure. In the reaction, sacrificial Ag nanoparticle template in surfactantless condition is consumed quantitatively depending on Pd2+ ion concentration. Verification of the synthetic technique has been approved by the change in surface plasmon resonance (SPR) peak nature of Ag nanoparticle. The as-synthesized unsupported AgPd nanostructure exhibits superior electrochemical property towards ethanol oxidation reaction (EOR) in alkaline medium in comparison to electrochemically active commercial Pd/C. The enhancement of catalytic Pd activation relates to its active sites in presence of Ag. The presence of oxophilic Ag and synergism between Ag and Pd drastically reduce the catalyst poisoning effect, explained by electron affinity and electronegativity parameters of the participating metals. The Ag driven electron drift from Pd and the Ag/Pd composition variation successfully illustrate the EOR mechanism.

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Publication details

The article was received on 02 Jul 2017, accepted on 07 Sep 2017 and first published on 08 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ02371E
Citation: New J. Chem., 2017, Accepted Manuscript
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    Silver Induced Electronic Drift in AgPd Bimetallics: Rationale for Enhanced Electrocatalytic Activity of Ethanol Oxidation Reaction

    A. Roy and T. Pal, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ02371E

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