Superior electrocatalytic activity of ultrathin PtPdBi nanowires towards ethanol electrooxidation

Abstract

Bimetallic catalysts, PtBi, PtPd and PdBi have been explored and may be promising candidates for nextgeneration anodic catalysts of direct alcohol fuel cells due to their enhanced catalytic activity and longterm durability. However, ternary PtPdBi alloy catalysts are rarely reported because of the synthetic difficulty in manipulating three metallic precursors. Here, ternary metallic Pt x Pd 93Àx Bi 7 alloy nanowires were prepared for systematically investigating their electrocatalytic activity towards ethanol oxidation in basic solution by cyclic voltammetric and amperometric techniques. Pt x Pd 93Àx Bi 7 alloy nanowire, whether loaded on Vulcan XC72 carbon (C) or reduced graphene oxide (RGO), has better catalytic activity than PtPd, PtBi, PdBi, Pt/C, or Pd catalyst. Nevertheless, the catalytic activity of Pt x Pd 93Àx Bi 7 closely depends on the Pt : Pd atomic ratio. Pt 55 Pd 38 Bi 7 alloy nanowire with the optimal Pt : Pd atomic ratio can produce the maximum enhancement towards ethanol electrooxidation. RGO replacing C as catalyst supporter can further improve the catalytic performance of catalyst. Pt 55 Pd 38 Bi 7 /RGO exhibits a superior catalytic performance, the mass activity of which reaches $3.60 A mg À1 , $6 times better than commercial Pt/C. View Article Online Pd 45 Pt 55 nanowire 0.95 A mg metal À1 7 58338 | RSC Adv., 2016, 6, 58336-58342 This journal is

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