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Ion Beam Modification of Pt Electrocatalyst Nanoparticles for Polymer Electrolyte Membrane Fuel Cells

Published online by Cambridge University Press:  31 January 2011

Tetsuya Yamaki ,
Shunya Yamamoto ,
Teruyuki Hakoda  and
Hiroshi Koshikawa
Tetsuya Yamaki
Affiliation:
[email protected], Japan Atomic Energy Agency, Quantum Beam Science Directorate, Takasaki, Japan
Shunya Yamamoto
Affiliation:
[email protected], Japan Atomic Energy Agency, Quantum Beam Science Directorate, Takasaki, Gunma, Japan
Teruyuki Hakoda
Affiliation:
[email protected], Japan Atomic Energy Agency, Quantum Beam Science Directorate, Takasaki, Gunma, Japan
Hiroshi Koshikawa
Affiliation:
[email protected], Japan Atomic Energy Agency, Quantum Beam Science Directorate, Takasaki, Gunma, Japan
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Abstract

Platinum (Pt) nanoparticles were prepared on a glassy carbon plate by a sputtering method and then irradiated with proton (H+) beams at energies of 0.38 and 10 MeV at room temperature. Cyclic voltammetry in an aqueous 0.5 mol/dm3 H2SO4 solution suggested that the lower-energy beam irradiation enhanced the active surface area of the Pt nanoparticles, calculated from the coulombic charge for hydrogen desorption. Thus, the nanoparticles would be modified by H+ beam-induced electronic excitation so that they have higher surface activity. The mechanism of this irradiation effect seems to be rather complicated and is still unclear at present, but we may discuss it in relation to a change in the interfacial crystal structure during the irradiation.

Keywords

catalyticPtion-beam processing
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1217: Symposium Y – Catalytic Materials for Energy, Green Processes and Nanotechnology , 2009 , 1217-Y08-26
Copyright
Copyright © Materials Research Society 2010

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