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题名: Hydrophilic poly(vinylidene fluoride) porous membrane with well connected ion transport networks for vanadium flow battery
作者: Cao, Jingyu1, 3;  Yuan, Zhizhang1, 3;  Li, Xianfeng1, 2;  Xu, Wanxing1, 3;  Zhang, Huamin1, 2
关键词: Vanadium flow battery ;  Poly(vinylidene fluoride) membrane ;  Hydrophilicity modification ;  Cross-linking and grafting
刊名: JOURNAL OF POWER SOURCES
发表日期: 2015-12-01
DOI: 10.1016/j.jpowsour.2015.08.067
卷: 298, 页:228-235
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: Hydrophilic poly(vinylidene fluoride) (PVDF) porous membranes are facilely fabricated via grafting polymerization and cross-linking reaction for vanadium flow battery (VFB) application. A solvent swelling pre-treatment is specifically carried out to introduce hydrophilic groups in the pores and on the surface, where they can form well connected ion transport networks. The modification is performed through chemical cross-linking and grafting of PVP by using potassium persulfate (K2S2O8) as a radical initiator. The effect of reaction condition on membrane morphology, hydrophilicity is characterized in detail. Meanwhile, the performance of modified membranes is detected in VFB single cell at a current density of 80 mA cm(-2). It is found that more PVP is immobilized on membrane surface and in the pores with prolonging reaction time. Consequently, the membrane wetability and effective pore size change dramatically, resulting better hydrophilicity and higher ion selectivity. As a result, the VFBs assembled with these modified membranes show higher CE and overall better EE than unmodified ones. The optimized membrane shows CE of 94.4% and EE of 83.3%, which is comparable to commercial Nafion 115. Furthermore, the prepared hydrophilic PVDF membranes demonstrate excellent chemical stability through the long-term battery operation, showing great prospects in VFB applications. (C) 2015 Elsevier B.V. All rights reserved.
关键词[WOS]: ANION-EXCHANGE MEMBRANES ;  ENERGY-STORAGE ;  ETHER KETONE) ;  SOLUBILITY PARAMETERS ;  TIO2 NANOPARTICLES ;  PVDF MEMBRANES ;  SINGLE-STEP ;  PERFORMANCE ;  PROGRESS ;  POLYMERIZATION
语种: 英语
WOS记录号: WOS:000362146800028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146575
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
2.Collaborat Innovat Ctr Chem Energy Mat iChEM, Dalian 116023, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Cao, Jingyu,Yuan, Zhizhang,Li, Xianfeng,et al. Hydrophilic poly(vinylidene fluoride) porous membrane with well connected ion transport networks for vanadium flow battery[J]. JOURNAL OF POWER SOURCES,2015,298:228-235.
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