Ion Beam Modification of Pt Electrocatalyst Nanoparticles for Polymer Electrolyte Membrane Fuel Cells
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<jats:title>Abstract</jats:title><jats:p>Platinum (Pt) nanoparticles were prepared on a glassy carbon plate by a sputtering method and then irradiated with proton (H<jats:sup>+</jats:sup>) beams at energies of 0.38 and 10 MeV at room temperature. Cyclic voltammetry in an aqueous 0.5 mol/dm<jats:sup>3</jats:sup> H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> 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<jats:sup>+</jats:sup> 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.</jats:p>
収録刊行物
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- MRS Proceedings
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MRS Proceedings 1217 2009-01-01
Springer Science and Business Media LLC