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题名: Effect of relative humidity cycles accompanied by intermittent start/stop switches on performance degradation of membrane electrode assembly components in proton exchange membrane fuel cells
作者: Qiu, Yanling1;  Zhong, Hexiang1;  Wang, Meiri1;  Zhang, Huamin1
关键词: Relative humidity cycles ;  Membrane electrode assembly components ;  Proton exchange membrane fuel cell ;  Intermittent start/stop switches ;  H-2 permeability ;  Catalyst agglomeration
刊名: JOURNAL OF POWER SOURCES
发表日期: 2015-06-01
DOI: 10.1016/j.jpowsour.2015.02.134
卷: 283, 页:171-180
收录类别: SCI
文章类型: Article
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 performance degradation of membrane electrode assembly (MEA) components in proton exchange membrane fuel cell (PEMFC) is studied by designing relative humidity (RH) cycles accompanied by intermittent start/stop switches. Cathode catalyst activity, permeability and resistance of proton exchange membrane (PEM) as well as cell performance are monitored during the test procedure. The interfaces of MEA, the catalyst particle distribution near the cathode inlet are characterized by SEM and TEM, respectively. The results demonstrate both the overall H-2 permeability and crossover current of PEM are doubled compared with its initial properties. Signs of PEM degradation, including periodical thinning, cracks and pinholes formation, are observed after 300 RH cycles and 40 times of start/stop switches. The average Pt particle size increases by more than 75%, and the cathode electrochemical surface area decreases by 48% after the test procedure. Meanwhile, the cathode catalyst layer becomes looser due to the dissolution of some smaller Pt particles and catalyst agglomeration in the RH cycles and the high potential during the intermittent start/stop switches. The membrane resistance demonstrates downshift variation during the RH cycles. PEMFC performance, however, decays due to the chemical and electrochemical attack as well as the mechanical stresses. (C) 2015 Elsevier B.V. All rights reserved.
关键词[WOS]: ELECTROCHEMICAL DEGRADATION ;  MICROSTRUCTURAL CHANGES ;  OPERATING-CONDITIONS ;  CARBON CORROSION ;  CATALYST LAYERS ;  DURABILITY ;  TEMPERATURE ;  CATHODE ;  PEMFC ;  PEFC
语种: 英语
WOS记录号: WOS:000353731700018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146199
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, Div Energy Storage, Dalian 116023, Peoples R China

Recommended Citation:
Qiu, Yanling,Zhong, Hexiang,Wang, Meiri,et al. Effect of relative humidity cycles accompanied by intermittent start/stop switches on performance degradation of membrane electrode assembly components in proton exchange membrane fuel cells[J]. JOURNAL OF POWER SOURCES,2015,283:171-180.
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