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Title	en K-edge X-ray absorption fine structure analysis of Pt/Au core-shell electrocatalyst : evidence for short Pt-Pt distance
Creator	en Kaito, Takahiro en Mitsumoto, Hisashi en Sugawara, Seiho en Shinohara, Kazuhiko en Uehara, Hiromitsu en Ariga, Hiroko en Takakusagi, Satoru NRID 1000030359484 en Hatakeyama, Yoshikiyo en Nishikawa, Keiko NRID 1000060080470 en Asakura, Kiyotaka NRID 1000060175164
Accessrights	open access
Subject	NDC 431
Description	Abstract en A carbon-supported Pt-shell Au-core electrocatalyst (Pt/Au/C) was prepared by sequential deposition of Pt ions on the surface of Au nanoparticles supported on carbon. The area-specific activity of the oxygen reduction reaction (ORR) for the prepared Pt/Au/C in 0.1 M HClO4, aqueous solution was approximately 2 times higher than that for a commercial carbon-supported Pt electrocatalyst (Pt/C). The core-shell structure was confirmed using electrochemical methods and Pt and Au K-edge X-ray absorption fine structure (XAFS) analysis. XAFS analyses indicated that the Pt-Pt bond distance for the Pt/Au/C catalyst was shorter than that for Pt foil and the Pt/C catalyst. In addition, the Au Au distance was much shorter than that for Au foil. The reason for the high ORR activity of Pt/Au/C is considered to be shorter Pt-Pt bond distance as compared to that of Pt/C.
Publisher	en American Chemical Society
Date	Issued2014-04-24
Language	eng
Resource Type	journal article
Version Type	VoR
Identifier	HDL http://hdl.handle.net/2115/56614
Relation	isIdenticalTo DOI https://doi.org/10.1021/jp501607f
Journal	PISSN 1932-7447 EISSN 1932-7455 NCID AA1217589X en Journal of physical chemistry. C Volume Number118 Issue Number16 Page Start8481 Page End8490
File	fulltext jp501607f.pdf 4.61 MB (application/pdf) Issued2014-04-24
Oaidate	2023-07-26