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Operando Time-Resolved X-ray Absorption Fine Structure Study for Surface Events on a Pt3Co/C Cathode Catalyst in a Polymer Electrolyte Fuel Cell during Voltage-Operating Processes

descriptionPublicationkeyboard_double_arrow_right Article , Journal 30 May 2012Publisher:American Chemical Society (ACS)Journal:ACS Catalysis, volume 2, pages 1,319-1,330 (issn: 2155-5435, eissn: 2155-5435,

Authors: Oki Sekizawa; Tomoya Uruga; Yasuhiro Iwasawa;

Toshihiko Yokoyama; Toshihiko Yokoyama; Takahiro Saida; Mizuki Tada; +8 Authors

doi: 10.1021/cs300228p

Operando Time-Resolved X-ray Absorption Fine Structure Study for Surface Events on a Pt3Co/C Cathode Catalyst in a Polymer Electrolyte Fuel Cell during Voltage-Operating Processes

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Abstract

The structural kinetics of surface events on a Pt3Co/C cathode catalyst in a polymer electrolyte fuel cell (PEFC) was investigated by operando time-resolved X-ray absorption fine structure (XAFS) with a time resolution of 500 ms. The rate constants of electrochemical reactions, the changes in charge density on Pt, and the changes in the local coordination structures of the Pt3Co alloy catalyst in the PEFC were successfully evaluated during fuel-cell voltage-operating processes. Significant time lags were observed between the electrochemical reactions and the structural changes in the Pt3Co alloy catalyst. The rate constants of all the surface events on the Pt3Co/C catalyst were significantly higher than those on the Pt/C catalyst, suggesting the advantageous behaviors (cell performance and catalyst durability) on the Pt3Co alloy cathode catalyst.

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University of Tokyo
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The Graduate University for Advanced Studies, SOKENDAI
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Keywords

PEFC, operando XAFS, fuel cell, Pt3Co catalyst, structural kinetics, time-resolved XAFS

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