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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
| Title: | 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 |
| Authors: | Feiten, Felix E. Browse this author | | Takahashi, Shuntaro Browse this author | | Sekizawa, Oki Browse this author | | Wakisaka, Yuki Browse this author | | Sakata, Tomohiro Browse this author | | Todoroki, Naoto Browse this author | | Uruga, Tomoya Browse this author | | Wadayama, Toshimasa Browse this author | | Iwasawa, Yasuhiro Browse this author | | Asakura, Kiyotaka Browse this author →KAKEN DB |
| Issue Date: | 14-Sep-2020 |
| Publisher: | Royal Society of Chemistry |
| Journal Title: | Physical chemistry chemical physics |
| Volume: | 22 |
| Issue: | 34 |
| Start Page: | 18815 |
| End Page: | 18823 |
| Publisher DOI: | 10.1039/c9cp06891k |
| Abstract: | 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. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/82650 |
| Appears in Collections: | 触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 朝倉 清高
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