One dimensional Ag/Au/AgCl nanocomposites stemmed from Ag nanowires for electrocatalysis of oxygen reduction

Jun Ho Shim, Jihye Yang, Su Jin Kim, Chongmok Lee, Youngmi Lee

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17 Scopus citations

Abstract

This paper reports the synthesis and characterization of one dimensional nanocomposites composed of Ag, Au, and AgCl (denoted as Ag/Au/AgCl). The Ag/Au/AgCl composites with different compositional ratios are prepared by the galvanic replacement reaction between a Ag nanowire template and Au precursor at various concentrations (1, 10, 100 mM HAuCl4). As the Au precursor concentration increases, the structure of the resulting Ag/Au/AgCl changes from a core-shell solid wire to a porous hollow wire with a decrease in the Ag and AgCl contents and increase in the Au content. The catalytic activity of Ag/Au/AgCl for the oxygen reduction reaction (ORR) is investigated in 0.1 M NaOH solution. The nanocomposite with a Ag:Au:AgCl compositional ratio of 4:86:10 shows reasonable ORR activity (high ORR current, positive onset potential) along with sufficient stability and ethanol tolerance in alkaline media, suggesting that it could be used as a substitute for Pt-based cathode catalysts in fuel cells.

Original languageEnglish
Pages (from-to)15285-15290
Number of pages6
JournalJournal of Materials Chemistry
Volume22
Issue number30
DOIs
StatePublished - 14 Aug 2012

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