Pt�?�Au/C cathode with enhanced oxygen-reduction activity in PEFCs

Bulletin of materials science

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

[1] CSIR-Central Electrochemical Research Institute-Madras Unit, CSIR Madras Complex, Chennai 600 113, India$$CSIR-Central Electrochemical Research Institute-Madras Unit, CSIR Madras Complex, Chennai 600 113, IndiaCSIR-Central Electrochemical Research Institute-Madras Unit, CSIR Madras Complex, Chennai 600 113, India$$;Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India$$Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, IndiaSolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India$$

关键词: Polymer electrolyte fuel cells;    cathode catalyst;    platinumâ€�?�gold alloy;    oxygen-reduction reaction.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Carbon-supported Ptâ€�?�Au (Ptâ€�?�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 Ptâ€�?�Au/C catalyst prepared by colloidal method. The optimum atomic ratio of Pt to Au in Ptâ€�?�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 Ptâ€�?�Au/C catalysts, (3:1) Ptâ€�?�Au/C exhibits maximum electrochemical activity towards ORR. Powder X-ray diffraction pattern and transmission electron micrograph suggest Ptâ€�?�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) Ptâ€�?�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.

【 授权许可】

Unknown