Article

Journal of Materials Science

, Volume 48, Issue 5, pp 2142-2150

First online:

Carbon-supported AuPd bimetallic nanoparticles synthesized by high-energy electron beam irradiation for direct formic acid fuel cell

  • Yuji OhkuboAffiliated withGraduate School of Engineering, Osaka University Email author 
  • , Masashi ShibataAffiliated withGraduate School of Engineering, Osaka University
  • , Satoru KageyamaAffiliated withGraduate School of Engineering, Osaka University
  • , Satoshi SeinoAffiliated withGraduate School of Engineering, Osaka University
  • , Takashi NakagawaAffiliated withGraduate School of Engineering, Osaka University
  • , Junichiro KugaiAffiliated withGraduate School of Engineering, Osaka University
  • , Hiroaki NitaniAffiliated withInstitute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
  • , Takao A. YamamotoAffiliated withGraduate School of Engineering, Osaka University

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Abstract

Nanoparticle catalysts of carbon-supported Pd (Pd/C) and carbon-supported AuPd (AuPd/C) for the direct formic acid fuel cell (DFAFC) anode were synthesized by the reduction of precursor ions in an aqueous solution irradiated with a high-energy electron beam. We obtained three kinds of nanoparticle catalysts: (1) Pd/C, (2) AuPd/C of the core–shell structure, and (3) AuPd/C of the alloy structure. The structures of AuPd nanoparticles were controlled by the addition of citric acid as a chelate agent, and sodium hydroxide as a pH controller. The structures of nanoparticle catalysts were characterized using transmission electron microscopy, inductively coupled plasma atomic emission spectrometry, the techniques of X-ray diffraction and X-ray absorption fine structure. The catalytic activity of the formic acid oxidation was evaluated using linear sweep voltammetry. The oxidation current value of AuPd/C was higher than that of Pd/C. This indicated that the addition of Au to Pd/C improved the oxidation activity of the DFAFC anode. In addition, the AuPd/C of the alloy structure had higher oxidation activity than the AuPd/C of the core–shell structure. The control of the AuPd mixing state was effective in enhancing the formic acid oxidation activity.