K-edge X-ray absorption fine structure analysis of Pt/Au core-shell electrocatalyst : evidence for short Pt-Pt distance

Kaito, Takahiro; Mitsumoto, Hisashi; Sugawara, Seiho et al.

Journal of physical chemistry. C, 2014, 118(16), 8481-8490

Permalink : https://hdl.handle.net/2115/56614

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アクセス権
open access
URI
https://hdl.handle.net/2115/56614
タイトル
K-edge X-ray absorption fine structure analysis of Pt/Au core-shell electrocatalyst : evidence for short Pt-Pt distance
著者
Kaito, Takahiro ; Mitsumoto, Hisashi ; Sugawara, Seiho ; Shinohara, Kazuhiko ; Uehara, Hiromitsu ; Ariga, Hiroko ; Takakusagi, Satoru ; Hatakeyama, Yoshikiyo ; Nishikawa, Keiko ; Asakura, Kiyotaka
著者名
Kaito, Takahiro
著者名
Mitsumoto, Hisashi
著者名
Sugawara, Seiho
著者名
Shinohara, Kazuhiko
著者名
Uehara, Hiromitsu
著者名
Ariga, Hiroko
e-Rad_Researcher
30359484
著者名
Takakusagi, Satoru
著者名
Hatakeyama, Yoshikiyo
e-Rad_Researcher
60080470
著者名
Nishikawa, Keiko
e-Rad_Researcher
60175164
著者名
Asakura, Kiyotaka
言語
英語
発行日
2014-04-24
出版者
American Chemical Society
収録物名
Journal of physical chemistry. C
巻(号)
118(16)
ページ
8481-8490
抄録
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.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
PISSN
1932-7447
EISSN
1932-7455
NCID
AA1217589X
関連情報 (isIdenticalTo)
出版社版DOI
https://doi.org/10.1021/jp501607f