Journal of Materials Science

, Volume 48, Issue 5, pp 2142–2150 | Cite as

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

  • Yuji Ohkubo
  • Masashi Shibata
  • Satoru Kageyama
  • Satoshi Seino
  • Takashi Nakagawa
  • Junichiro Kugai
  • Hiroaki Nitani
  • Takao A. Yamamoto
Article

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.

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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Yuji Ohkubo
    • 1
  • Masashi Shibata
    • 1
  • Satoru Kageyama
    • 1
  • Satoshi Seino
    • 1
  • Takashi Nakagawa
    • 1
  • Junichiro Kugai
    • 1
  • Hiroaki Nitani
    • 2
  • Takao A. Yamamoto
    • 1
  1. 1.Graduate School of EngineeringOsaka UniversityOsakaJapan
  2. 2.Institute of Materials Structure ScienceHigh Energy Accelerator Research Organization (KEK)IbarakiJapan

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