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Characteristics of platinum nanoparticle catalysts for polymer electrolyte fuel cells prepared by ion implantation

Kato, Sho; Yamaki, Tetsuya; Yamamoto, Shunya; Hakoda, Teruyuki; Kawaguchi, Kazuhiro*; Kobayashi, Tomohiro*; Suzuki, Akihiro*; Terai, Takayuki*

Glassy carbon substrates were implanted with 100-keV platinum ions at fluences between 7$$times$$10$$^{15}$$ and 4$$times$$10$$^{16}$$ ions/cm$$^{2}$$. The unimplanted samples were surface-etched electrochemically and thermally treated in order to prepare platinum nanoparticles on their topmost layer. Scanning electron microscope observation revealed the platinum nanoparticles with a diameter of a few tens of nanometers on the surface. The voltammogram using a rotating disk electrode showed large cathodic current due to oxygen reduction reaction activity of the obtained nanoparticles.

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