| Title: | Structural Transformation of Pt–Ni Nanowires as Oxygen Reduction Electrocatalysts to Branched Nanostructures during Potential Cycles |
| Authors: | Kato, Masaru Browse this author →KAKEN DB |
| Iguchi, Yoshimi Browse this author |
| Li, Tianchi Browse this author |
| Kato, Yuta Browse this author |
| Zhuang, Yu Browse this author |
| Higashi, Kotaro Browse this author →KAKEN DB |
| Uruga, Tomoya Browse this author →KAKEN DB |
| Saida, Takahiro Browse this author →KAKEN DB |
| Miyabayashi, Keiko Browse this author →KAKEN DB |
| Yagi, Ichizo Browse this author →KAKEN DB |
| Keywords: | Nanowires |
| oxygen reduction reaction |
| in situ X-ray absorption spectroscopy |
| polymer electrolyte fuel cell |
| branched nanostructures |
| Ostwald ripening |
| phase engineering of nanomaterials |
| Issue Date: | 7-Jan-2022 |
| Publisher: | American Chemical Society(ACS) |
| Journal Title: | ACS Catalysis |
| Volume: | 12 |
| Issue: | 1 |
| Start Page: | 259 |
| End Page: | 264 |
| Publisher DOI: | 10.1021/acscatal.1c04597 |
| Abstract: | We report the preparation, oxygen reduction reaction (ORR) electrocatalytic activity, and structural transformation of Pt–Ni nanowires (NWs) during potential cycles in the presence and absence of Pt–Ni nanoparticles (NPs). The ORR activity of NWs increases over 25000 potential cycles in the presence of NPs, involving the structural transformation of NWs to branched nanostructures assisted by Ostwald ripening of NPs. This structural transformation is coupled with the surface electronic structural change, as confirmed by in situ X-ray absorption spectroscopy and carbon monoxide stripping voltammetry, leading to catalytic activity improvement and Pt dissolution suppression. Although a similar structural transformation was also observed even in the absence of NPs, greater amounts of Pt were dissolved during potential cycles. These results indicate that the structural transformation is intrinsic to Pt-based NWs but the structural transformation of NWs assisted by Ostwald ripening of NPs is beneficial to suppress the Pt dissolution. The concept of the structural optimization of nanostructured catalysts assisted by Ostwald ripening of NPs under potential cycles will guide us to develop highly active and durable Pt-based electrocatalysts and phase-engineered nanomaterials. |
| Rights: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Catalysis, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/articlesonrequest/AOR-HVAXE3MUU2D9C4M6QGQ9. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/87476 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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