Model building analysis : a novel method for statistical evaluation of Pt L3-edge EXAFS data to unravel the structure of Pt-alloy nanoparticles for the oxygen reduction reaction on highly oriented pyrolytic graphite

Feiten, Felix E.; Takahashi, Shuntaro; Sekizawa, Oki et al.

Physical chemistry chemical physics, 2020, 22(34), 18815-18823

Permalink : https://hdl.handle.net/2115/82650

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アクセス権
open access
URI
https://hdl.handle.net/2115/82650
タイトル
Model building analysis : a novel method for statistical evaluation of Pt L3-edge EXAFS data to unravel the structure of Pt-alloy nanoparticles for the oxygen reduction reaction on highly oriented pyrolytic graphite
著者
Feiten, Felix E. ; Takahashi, Shuntaro ; Sekizawa, Oki ; Wakisaka, Yuki ; Sakata, Tomohiro ; Todoroki, Naoto ; Uruga, Tomoya ; Wadayama, Toshimasa ; Iwasawa, Yasuhiro ; Asakura, Kiyotaka
著者名
Feiten, Felix E.
著者名
Takahashi, Shuntaro
著者名
Sekizawa, Oki
著者名
Wakisaka, Yuki
著者名
Sakata, Tomohiro
著者名
Todoroki, Naoto
著者名
Uruga, Tomoya
著者名
Wadayama, Toshimasa
著者名
Iwasawa, Yasuhiro
e-Rad_Researcher
60175164
著者名
Asakura, Kiyotaka
言語
英語
発行日
2020-09-14
出版者
Royal Society of Chemistry
収録物名
Physical chemistry chemical physics
巻(号)
22(34)
ページ
18815-18823
抄録
Extended X-ray absorption fine structure (EXAFS) is a powerful tool to determine the local structure in Pt nanoparticles (NP) on carbon supports, active catalysts for fuel cells. Highly oriented pyrolytic graphite (HOPG) covered with Pt NP gives samples with flat surfaces that allow application of surface science techniques. However, the low concentration of Pt makes it difficult to obtain good quality EXAFS data. We have performedin situhighly sensitive BCLA-empowered Back Illuminated EXAFS (BCLA + BI-EXAFS) measurements on Pt alloy nanoparticles. We obtained high quality Pt L-3-edge data. We have devised a novel analytical method (model building analysis) to determine the structure of multi-component nanoparticles from just a single absorption edge. The generation of large numbers of structural models and their comparison with EXAFS fits allows us to determine the structures of Pt-containing nanoparticles, catalysts for the oxygen reduction reaction. Our results show that PtCo, PtCoN and AuPtCoN form a Pt-shell during electrochemical dealloying and that the ORR activity is directly proportional to the Pt-Pt bond length.
資源タイプ
学術雑誌論文
出版タイプ
Accepted Manuscript
PISSN
1463-9076
関連情報 (isVersionOf)
出版社版DOI
https://doi.org/10.1039/c9cp06891k