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题名: Studies of performance degradation of a high temperature PEMFC based on H3PO4-doped PBI
作者: Liu, Gang;  Zhang, Huamin;  Hu, Jingwei;  Zhai, Yunfeng;  Xu, Dongyan;  Shao, Zhi-gang
通讯作者: 张华民
关键词: high temperature PEMFC ;  carbon supported platinum ;  catalyst agglomeration ;  PBI membrane degradation ;  life test
刊名: JOURNAL OF POWER SOURCES
发表日期: 2006-11-08
DOI: 10.1016/j.jpowsour.2006.07.008
卷: 162, 期:1, 页:547-552
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: In this paper, a 600 h life test of a high temperature PEMFC based on phosphoric acid (H3PO4)-doped polybenzimidazole (PBI) (H3PO4/PBI HT-PEMFC) at a current density of 714 mA cm(-2) (the beginning 510h continuous test) and 300 mA cm(-2) (the last 90 h intermittent test) was carried out. After the life test, degradation of the MEA occurred. The H-2 crossover rate through the PBI membrane and the open circuit voltage (OCV) of the cell were tested with time. The results showed that, at the beginning of 510 h continuous test, the PBI membrane did not show much physical degradation, but during the last 90 h test there was a remarkable physical degradation which resulted in a higher H-2 crossover. The catalysts, PBI membranes and the membrane electrode assemblies (MEAs) before and after the life test were comprehensively examined by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). TEM results showed that the particle size of the Pt/C catalysts in the anode and cathode increased from 3.72 to 7.40 and 8.39 nm, respectively. SEM images of MEA in cross-section revealed that the PBI membrane became thin after the life test. EDS analysis implied the leaching of H3PO4 from the PBI membrane had occurred. Therefore, we conclude that physical degradation of PBI membrane, agglomeration of the electrocatalysts (both anode and cathode) and the leaching of H3PO4 from the PBI membrane were responsible for the performance degradation of the H3PO4/PBI HT-PEMFC. (c) 2006 Elsevier B.V. All rights reserved.
关键词[WOS]: SUPPORTED PLATINUM CATALYSTS ;  ELECTROLYTE FUEL-CELLS ;  SURFACE-AREA LOSS ;  POLYMER ELECTROLYTE ;  OXYGEN REDUCTION ;  MEMBRANES ;  CARBON ;  LIFETIME
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000242059700066
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/97511
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, Proton Exchange Membrane Fuel Cell Key Mat & Tech, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Liu, Gang,Zhang, Huamin,Hu, Jingwei,et al. Studies of performance degradation of a high temperature PEMFC based on H3PO4-doped PBI[J]. JOURNAL OF POWER SOURCES,2006,162(1):547-552.
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