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  1. H120 物質科学国際研究センター
  2. H120a 雑誌掲載論文
  3. 学術雑誌

Kinetics and Mechanism of Redox Processes of Pt/C and Pt3Co/C Cathode Electrocatalysts in a Polymer Electrolyte Fuel Cell during an Accelerated Durability Test

http://hdl.handle.net/2237/25399
96f072ef-e779-47ad-90c7-d2da78e201a9
名前 / ファイル ライセンス アクション
160808_Manuscript.pdf 160808_Manuscript.pdf ファイル公開:2017/08/29 (4.1 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2017-01-17
タイトル
タイトル Kinetics and Mechanism of Redox Processes of Pt/C and Pt3Co/C Cathode Electrocatalysts in a Polymer Electrolyte Fuel Cell during an Accelerated Durability Test
言語 en
著者 Ishiguro, Nozomu

× Ishiguro, Nozomu

WEKO 68745

en Ishiguro, Nozomu

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Kityakarn, Sutasinee

× Kityakarn, Sutasinee

WEKO 68746

en Kityakarn, Sutasinee

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Sekizawa, Oki

× Sekizawa, Oki

WEKO 68747

en Sekizawa, Oki

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Uruga, Tomoya

× Uruga, Tomoya

WEKO 68748

en Uruga, Tomoya

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Matsui, Hirosuke

× Matsui, Hirosuke

WEKO 68749

en Matsui, Hirosuke

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Taguchi, Masahiro

× Taguchi, Masahiro

WEKO 68750

en Taguchi, Masahiro

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Nagasawa, Kensaku

× Nagasawa, Kensaku

WEKO 68751

en Nagasawa, Kensaku

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Yokoyama, Toshihiko

× Yokoyama, Toshihiko

WEKO 68752

en Yokoyama, Toshihiko

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Tada, Mizuki

× Tada, Mizuki

WEKO 68753

en Tada, Mizuki

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
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 [<br/>http://pubsdc3.acs.org/articlesonrequest/AOR-wawtvc5egRnFmdcrZX3H].”
抄録
内容記述 The degradation of Pt electrocatalysts in membrane electrode assemblies (MEAs) of polymer electrolyte fuel cells under working conditions is a serious problem for their practical use. Here we report the kinetics and mechanism of redox reactions at the surfaces of Pt/C and Pt3Co/C cathode electrocatalysts during catalyst degradation processes by an accelerated durability test (ADT) studied by operando time-resolved X-ray absorption fine structure (XAFS) spectroscopy. Systematic analysis of a series of Pt LIII-edge time-resolved XAFS spectra measured every 100 ms at different degradation stages revealed changes in the kinetics of Pt redox reactions on Pt/C and Pt3Co/C cathode electrocatalysts. In the case of Pt/C, as the number of ADT cycles increased, structural changes for Pt redox reactions (charging, surface, and subsurface oxidation) became less sensitive because of the agglomeration of catalyst particles. It was found that their rate constants were almost constant independent of the agglomeration of the Pt electrocatalyst. On the other hand, in the case of Pt3Co/C, the rate constants of the redox reactions of the cathode electrocatalyst gradually reduced as the number of ADT cycles increased. The differences in the kinetics for the redox processes would be differences in the degradation mechanism of these cathode electrocatalysts.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 ACS Publications
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ AM
出版タイプResource http://purl.org/coar/version/c_ab4af688f83e57aa
DOI
関連タイプ isVersionOf
関連識別子
識別子タイプ DOI
関連識別子 https://doi.org/10.1021/acs.jpcc.6b04437
ISSN
収録物識別子タイプ PISSN
収録物識別子 1932-7447
書誌情報 en : The Journal of Physical Chemistry C

巻 120, 号 35, p. 19642-19651, 発行日 2016-08-29
著者版フラグ
値 author
URI
識別子 http://doi.org/10.1021/acs.jpcc.6b04437
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/25399
識別子タイプ HDL
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