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题名: The stability of Pt/C catalyst in H3PO4/PBI PEMFC during high temperature life test
作者: Zhai, Yunfeng;  Zhang, Huamin;  Xing, Danmin;  Shao, Zhi-Gang
通讯作者: 张华民
关键词: high temperature PEMFC ;  PBI/H3PO4 ;  platinum electrocatalyst ;  electrochemical surface area ;  coalescence mechanism
刊名: JOURNAL OF POWER SOURCES
发表日期: 2007-01-10
DOI: 10.1016/j.jpowsour.2006.09.069
卷: 164, 期:1, 页:126-133
收录类别: SCI
文章类型: Article
部门归属: 3
项目归属: 303
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Electrochemistry ;  Energy & Fuels
英文摘要: 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.
关键词[WOS]: PROTON-EXCHANGE MEMBRANE ;  FUEL-CELLS ;  POLYMER ELECTROLYTE ;  PHOSPHORIC-ACID ;  PLATINUM ;  POLYBENZIMIDAZOLE ;  DEPOSITION ;  CARBON
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000243675300019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/98985
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 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

Recommended Citation:
Zhai, Yunfeng,Zhang, Huamin,Xing, Danmin,et al. The stability of Pt/C catalyst in H3PO4/PBI PEMFC during high temperature life test[J]. JOURNAL OF POWER SOURCES,2007,164(1):126-133.
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