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      https://www.ias.ac.in/article/fulltext/boms/034/02/0337-0346

    • Keywords

       

      Polymer electrolyte fuel cells; cathode catalyst; platinum–gold alloy; oxygen-reduction reaction.

    • Abstract

       

      Carbon-supported Pt–Au (Pt–Au/C) catalyst is prepared separately by impregnation, colloidal and micro-emulsion methods, and characterized by physical and electrochemical methods. Highest catalytic activity towards oxygen-reduction reaction (ORR) is exhibited by Pt–Au/C catalyst prepared by colloidal method. The optimum atomic ratio of Pt to Au in Pt–Au/C catalyst prepared by colloidal method is determined using linear-sweep and cyclic voltammetry in conjunction with cell-polarization studies. Among 3:1, 2:1 and 1:1 Pt–Au/C catalysts, (3:1) Pt–Au/C exhibits maximum electrochemical activity towards ORR. Powder X-ray diffraction pattern and transmission electron micrograph suggest Pt–Au alloy nanoparticles to be well dispersed onto the carbon-support. Energy dispersive X-ray analysis and inductively coupled plasma-optical emission spectroscopy data suggest that the atomic ratios of the alloying elements match well with the expected values. A polymer electrolyte fuel cell (PEFC) operating at 0.6 V with (3:1) Pt–Au/C cathode delivers a maximum power-density of 0.65 W/cm2 in relation to 0.53 W/cm2 delivered by the PEFC with pristine carbon-supported Pt cathode.

    • Author Affiliations

       

      G Selvarani1 S Vinod Selvaganesh1 P Sridhar1 S Pitchumani1 A K Shukla2

      1. CSIR-Central Electrochemical Research Institute-Madras Unit, CSIR Madras Complex, Chennai 600 113, India
      2. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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      Posted on July 25, 2019

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