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题名: Sub-freezing endurance of PEM fuel cells with different catalyst-coated membranes
作者: Song, Wei1, 2;  Hou, Junbo1, 2;  Yu, Hongmei1;  Hao, Lixing1, 2;  Shao, Zhigang1;  Yi, Baolian1
通讯作者: 俞红梅
关键词: Fuel cell ;  Proton exchange membrane (PEM) ;  Sub-freezing ;  Freeze/thaw ;  Catalyst layer ;  Hydrophobicity/hydrophilicity
刊名: JOURNAL OF APPLIED ELECTROCHEMISTRY
发表日期: 2009-05-01
DOI: 10.1007/s10800-008-9700-6
卷: 39, 期:5, 页:609-615
收录类别: SCI
文章类型: Article
部门归属: 3
项目归属: 301
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: The sub-freezing endurance of proton exchange membrane (PEM) fuel cells with hydrophobic and hydrophilic catalyst-coated membranes (CCMs) was investigated. The polarization curves, electrochemical characteristics and physical structures of the CCMs were measured. The cells were frozen at -20 A degrees C with saturated residual water after operating at 60 A degrees C. After eight freeze/thaw cycles, no evident negative effect on the performance of the cell with a hydrophobic CCM was observed, while the cell with a hydrophilic CCM degraded severely. By analyzing the polarization curves, it was concluded that the mass transport limitation was the main reason for the performance loss of the hydrophilic cell. The electrochemical active surface area (ECA) results suggest that the hydrophobicity of the catalyst layer (CL) has an apparent impact on the residual water distribution of the membrane electrode assembly (MEA). A larger water content in the hydrophilic CL has a negative effect on the subzero endurance. From the polarization resistance obtained from electrochemical impedance spectroscopy (EIS) the origin of degradation was further clarified. Mercury intrusion porosimetry showed that the pore size of the hydrophilic catalyst layer changed significantly after freezing; the mean pore size increased from 5.68 to 6.71 nm. However, with a water removal method, namely, gas purging, it was possible to prevent degradation effectively.
关键词[WOS]: COLD START ;  ELECTROCHEMICAL IMPEDANCE ;  REPETITIVELY BROUGHT ;  PERFORMANCE ;  TEMPERATURES ;  WATER ;  LAYER ;  ELECTRODES ;  BEHAVIOR ;  DESIGN
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000265215000007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/101759
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, Lab Fuel Cells, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Song, Wei,Hou, Junbo,Yu, Hongmei,et al. Sub-freezing endurance of PEM fuel cells with different catalyst-coated membranes[J]. JOURNAL OF APPLIED ELECTROCHEMISTRY,2009,39(5):609-615.
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