Simultaneous Operando Time-Resolved XAFS-XRD Measurements of a Pt/C Cathode Catalyst in Polymer Electrolyte Fuel Cell under Transient Potential Operations

被引：41

作者：

Sekizawa, Oki ^{[1
]}

Uruga, Tomoya ^{[1
,2
]}

Higashi, Kotaro ^{[1
]}

Kaneko, Takuma ^{[1
]}

Yoshida, Yusuke ^{[1
]}

Sakata, Tomohiro ^{[1
]}

Iwasawa, Yasuhiro ^{[1
]}

机构：

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

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

来源：

ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2017年 / 5卷 / 05期

关键词：

Simultaneous operando time-resolved QXAFS-XRD measurements; Pt/C cathode catalyst; Polymer electrolyte fuel cell (PEFC); Transient response structural and electronic transformations; X-RAY-DIFFRACTION; IN-SITU; OXYGEN REDUCTION; REAL-TIME; TRANSFORMATIONS; ABSORPTION;

D O I：

10.1021/acssuschemeng.7b00052

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We have succeeded in simultaneous operando time-resolved quick X-ray absorption fine structure (QXAFS) X-ray diffraction (XRD) measurements at each acquisition time of 20 ms for a Pt/C cathode catalyst in a polymer electrolyte fuel cell (PEFC), while measuring the current/charge of the PEFC during the transient voltage cyclic processes (0.4 V-RHE -> 1.4 V-RHE -> 0.4 V-RHE) under H-2(anode) N-2(cathode). The rate constants for Pt-O bond formation/dissociation, Pt charging/discharging, Pt-Pt bond dissociation/reformation, and decrease/increase of Pt metallic phase core size under the transient potential operations were determined by the combined time-resolved QXAFS XRD technique. The present study provides a new insight into the transient-response reaction mechanism and structural transformation in the Pt surface layer and bulk, which origin of PEFC activity and durability as key issues for the development of next-generation PEFCs.

引用

页码：3631 / 3636

页数：6

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