The stability of Pt/C catalyst in H3PO4/PBI PEMFC during high temperature life test

被引:146
作者
Zhai, Yunfeng
Zhang, Huamin
Xing, Danmin
Shao, Zhi-Gang
机构
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Lab PEMFC Key Mat & Technol, Dalian 116023, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
基金
中国国家自然科学基金;
关键词
high temperature PEMFC; PBI/H3PO4; platinum electrocatalyst; electrochemical surface area; coalescence mechanism;
D O I
10.1016/j.jpowsour.2006.09.069
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 stability of Pt/C electrocatalyst was investigated by a series of intermittent life tests (100, 300 and 520 h) of single proton exchange membrane fuel cell (PEMFC) with phosphoric acid doped PBI (H3PO4/PBI) membranes at high temperature. The electrochemical surface area (ESA) loss of cathode electrocatalyst was investigated by electrochemical techniques (cyclic voltammetry, CV). During the first about 300 h, the ESA decreased fast from 17.2 to 7.8 m(2) g(Pt)(-1) (about 55%), and had only a small decrease (about 5%) in the following 210 h. The tested cathode catalysts were analyzed by transmission electron microscopy (TEM) and X-ray diffraction (XRD) to determine the degree of electrocatalyst sintering. The results showed that the Pt particle size in the cathode increased from 4.0 to 8.3 nm before and after 300 It but it had no obvious growth in the further life tests. The tested MEA was also analyzed by energy dispersive X-ray (EDX) to investigate the platinum deposition in H3PO4/PBI membrane. Platinum did not be found in the tested H3PO4/PBI membrane. Above results indicated that the agglomeration of Pt particle should be responsible for the ESA loss of Pt/C electrocatalyst. The further analyses on TEM data suggested that agglomeration of platinum particles occurred via coalescence mechanism on carbon at the nanometer scale. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:126 / 133
页数:8
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