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Key Structural Kinetics for Carbon Effects on the Performance and Durability of Pt/Carbon Cathode Catalysts in Polymer Electrolyte Fuel Cells Characterized by In Situ Time-Resolved X-ray Absorption Fine Structure
https://uec.repo.nii.ac.jp/records/8918
https://uec.repo.nii.ac.jp/records/89182fdcbc28-b5e7-43fb-8788-ba726832f900
名前 / ファイル | ライセンス | アクション |
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Key Structural Kinetics (7.2 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-01-21 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Key Structural Kinetics for Carbon Effects on the Performance and Durability of Pt/Carbon Cathode Catalysts in Polymer Electrolyte Fuel Cells Characterized by In Situ Time-Resolved X-ray Absorption Fine Structure | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Kaneko, Takuma
× Kaneko, Takuma× Samjeské, Gabor× Nagamatsu, Shin-ichi× Higashi, Kotaro× Sekizawa, Oki× Takao, Shinobu× Yamamoto, Takashi× Zhao, Xiao× Sakata, Tomohiro× Uruga, Tomoya× Iwasawa, Yasuhiro |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The structural kinetics (rate constants for electronic and structural transformations) of the Pt charging/discharging, Pt–Pt bond dissociation/re-formation, and Pt–O bond formation/dissociation of Pt/Ketjenblack, Pt/acetylene black, and Pt/multiwalled carbon nanotube cathode catalysts in polymer electrolyte fuel cell (PEFC) membrane electrode assemblies (MEAs) under transient potential operations (0.4 VRHE → 1.4 VRHE → 0.4 VRHE) has been studied by in situ/operando time-resolved quick X-ray absorption fine structure (QXAFS; 100 ms/spectrum), while measuring electrochemical currents/charges in the MEAs under the potential operations. From the systematic QXAFS analysis for potential-dependent surface structures and rate constants (k and k′) for the transformations of Pt nanoparticles under the operations (0.4 VRHE → 1.4 VRHE and 1.4 VRHE → 0.4 VRHE), respectively, we have found the structural kinetics (k′Pt–O and k′valence) controlling the oxygen reduction reaction (ORR) activity and also the structural kinetics (k′Pt–Pt/kPt–Pt) reflecting the durability of the cathode catalysts. The relaxation time of the Pt–Pt bond re-formation and Pt–O bond dissociation processes in the activated MEAs was also suggested to predict the relative durability of similar kinds of cathode catalysts. The in situ time-resolved XAFS analysis provided direct information on the key structural kinetics of the Pt/C catalysts themselves for thorough understanding of the cathode catalysis toward PEFC improvement. | |||||
書誌情報 |
en : The Journal of Physical Chemistry C 巻 120, 号 42, p. 24250-24264, 発行日 2016-10-27 |
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出版者 | ||||||
出版者 | ACS Publications | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1932-7447 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1021/acs.jpcc.6b08569 | |||||
権利 | ||||||
権利情報 | This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, 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/doi/abs/10.1021/acs.jpcc.6b08569. | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1021/acs.jpcc.6b08569 | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa |