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Kakitani, Kenta*; Kimata, Tetsuya*; Yamaki, Tetsuya; Yamamoto, Shunya; Terai, Takayuki*; Kobayashi, Tomohiro*
no journal, ,
Platinum (Pt) nanoparticles with high oxygen reduction reaction (ORR) activity have been required for applications to polymer electrolyte fuel cells. We prepared the Pt nanoparticles on a glassy carbon (GC) substrate irradiated with 380 keV Ar to tune the electronic structure of Pt nanoparticles and enhance the ORR activity. Rotating disk electrode measurements demonstrated that the Pt nanoparticles exhibited 2.5 times higher current density on the irradiated GC substrate than on the non-irradiated one. This improvement of the activity could be attributed to the formation of Pt-C bonding at the Pt/GC interface.
Kimata, Tetsuya*; Yamaki, Tetsuya; Yamamoto, Shunya; Matsumura, Daiju; Shimoyama, Iwao; Terai, Takayuki*; Iwase, Akihiro*; Fujimura, Yuki*; Kobayashi, Tomohiro*; Hakoda, Teruyuki
no journal, ,
Carbon-supported platinum (Pt) nanoparticles have been studied intensively for applications to oxygen reduction reaction (ORR) catalysts in polymer electrolyte fuel cells. The Pt nanoparticles on the Ar-ion-irradiated glassy carbon (GC) substrate were previously found to have improved ORR activity. We analyzed here the local structure by XAFS measurements to clarify the mechanism of the Pt-C bonding at the Pt/GC interface, which could contribute to the observed high ORR activity. EXAFS of Pt L edge demonstrated that the Pt-Pt bond length in the Pt nanoparticles was shorter on the Ar-ion-irradiated GC substrate than on the non-irradiated one. Therefore, the formation of Pt-C bonding would modify the structure of the Pt nanoparticles, thereby improving the ORR activity of the Pt nanoparticles.
Sugimoto, Masaki; Ota, Tomonori*; Yamamoto, Shunya; Koshikawa, Hiroshi; Yamaki, Tetsuya; Hagiwara, Tokio*
no journal, ,
no abstracts in English