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

被引：96

作者：

Ishiguro, Nozomu ^{[1
,2
]}

Saida, Takahiro ^{[1
]}

Uruga, Tomoya ^{[3
,4
]}

Nagamatsu, Shin-ichi ^{[4
]}

Sekizawa, Oki ^{[4
]}

Nitta, Kiyofumi ^{[3
]}

Yamamoto, Takashi ^{[4
,5
]}

Ohkoshi, Shin-ichi ^{[2
]}

Iwasawa, Yasuhiro ^{[4
]}

Yokoyama, Toshihiko ^{[1
,6
]}

Tada, Mizuld ^{[1
,6
]}

机构：

[1] Inst Mol Sci, Okazaki, Aichi 4448585, Japan

[2] Univ Tokyo, Grad Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan

[3] SPring 8, Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan

[4] Univ Electrocommun, Innovat Res Ctr Fuel Cells, Chofu, Tokyo 1828585, Japan

[5] Univ Tokushima, Fac Integrated Arts & Sci, Dept Math & Mat Sci, Tokushima 7708502, Japan

[6] Grad Univ Adv Studies SOKENDAI, Okazaki, Aichi 4448585, Japan

来源：

ACS CATALYSIS | 2012年 / 2卷 / 07期

关键词：

fuel cell; PEFC; operando XAFS; time-resolved XAFS; Pt3Co catalyst; structural kinetics; OXYGEN REDUCTION REACTION; SHELL NANOPARTICLE ELECTROCATALYSTS; ACTIVITY-STABILITY RELATIONSHIPS; IN-SITU; PT-CO; ALLOY CATHODE; BIMETALLIC SURFACES; PLATINUM; DURABILITY; CARBON;

D O I：

10.1021/cs300228p

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 me. 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:

引用

页码：1319 / 1330

页数：12

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