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题名: MnO2/SiO2-SO3H nanocomposite as hydrogen peroxide scavenger for durability improvement in proton exchange membranes
作者: Zhao, D.1, 2;  Yi, B. L.1, 3;  Zhang, H. M.1;  Yu, H. M.3
通讯作者: 衣宝廉
关键词: Durability ;  Manganese dioxide ;  Surface-sulfonated ;  Free radicals ;  Hydrogen peroxide ;  Fast Blue BB Salt
刊名: JOURNAL OF MEMBRANE SCIENCE
发表日期: 2010
DOI: 10.1016/j.memsci.2009.09.031
卷: 346, 期:1, 页:143-151
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 ;  Technology ;  Physical Sciences
类目[WOS]: Engineering, Chemical ;  Polymer Science
研究领域[WOS]: Engineering ;  Polymer Science
英文摘要: Membrane durability was a key problem to the development of proton exchange membrane fuel cells (PEMFCs). A novel nanocomposite MnO2/SiO2-SO3H was prepared to mitigate the hydrogen peroxide attack to the membranes at fuel cell condition. The nanocomposites were synthesized by the wet chemical method and three-step functionalization. The crystal structure was characterized by X-ray powder diffraction (XRD), the crystallite size and the distribution of the nanocomposites were investigated by TEM. SEM-EDX was used to analyze the elemental distribution on the surface of the nanocomposite. And the surface functional groups (-SO3H) were evaluated by FT-IR. The amount of sulfonic acid groups introduced onto the silica surface was determined by titration method. The radical scavenging ability was estimated by UV-VIS spectroscopy using dimethyl sulfoxide (DMSO) as the trapping agent. The membrane durability was investigated via ex situ Fenton test and in situ open circuit voltage (OCV) accelerated test. In these tests, the fluoride emission rate (FER) reduced by nearly one order of magnitude with the dispersion of MnO2/SiO2-SO3H nanocomposites into Nafion membrane, suggesting that MnO2/SiO2-SO3H nanocomposites had a promising application to mitigate the degradation of the proton exchange membrane. (C) 2009 Elsevier B.V. All rights reserved.
关键词[WOS]: POLYMER ELECTROLYTE MEMBRANES ;  PEM FUEL-CELLS ;  PERFLUORINATED SULFONIC-ACID ;  STANDARD ADDITION METHOD ;  COMPOSITE MEMBRANES ;  ELECTROCHEMICAL PROPERTIES ;  DEGRADATION MECHANISM ;  GAS-CROSSOVER ;  CATALYTIC-ACTIVITY ;  PERFORMANCE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000271959000016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/103549
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, Liaoning, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Fuel Cell Syst & Engn Lab, Dalian 116023, Peoples R China

Recommended Citation:
Zhao, D.,Yi, B. L.,Zhang, H. M.,et al. MnO2/SiO2-SO3H nanocomposite as hydrogen peroxide scavenger for durability improvement in proton exchange membranes[J]. JOURNAL OF MEMBRANE SCIENCE,2010,346(1):143-151.
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