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题名: Bifunctional redox flow battery - 2. V(III)/V(II)-L-cystine(O-2) system
作者: Wen, Y. H.;  Cheng, J.1;  Xun, Y.;  Mac, P. H.2;  Yanga, Y. S.1
关键词: bifunctional redox flow batteries ;  L-cystine ;  organic electro-synthesis ;  separator ;  indirect oxygen electrode
刊名: ELECTROCHIMICA ACTA
发表日期: 2008-08-20
DOI: 10.1016/j.electacta.2008.03.026
卷: 53, 期:20, 页:6018-6023
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: A new bifunctional redox flow battery (BRFB) system, V(III)/V(II)-L-cystine(O-2), was systematically investigated by using different separators. It is shown that during charge, water transfer is significantly restricted with increasing the concentration of HBr when the Nafion 115 cation exchange membrane is employed. The same result can be obtained when the gas diffusion layer (GDL) hot-pressed separator is used. The organic electro-synthesis is directly correlated with the crossover of vanadium. When employing the anion exchange membrane, the electro-synthesis efficiency is over 96% due to a minimal crossover of vanadium. When the GDL hot-pressed separator is applied, the crossover of vanadium and water transfer are noticeably prevented and the electro-synthesis efficiency of over 99% is obtained. Those impurities such as vanadium ions and bromine can be eliminated through the purification of organic electro-synthesized products. The purified product is identified to be L-cysteic acid by IR spectrum. The BRFB shows a favorable discharge performance at a current density of 20 mA cm(-2). Best discharge performance is achieved by using the GDL hot-pressed separator. The coulombic efficiency of 87% and energy efficiency of about 58% can be obtained. The cause of major energy losses is mainly associated with the cross-contamination of anodic and cathodic active electrolytes. (C) 2008 Elsevier Ltd. All rights reserved.
关键词[WOS]: PHOTOVOLTAIC SYSTEMS ;  ENERGY ANALYSIS
语种: 英语
WOS记录号: WOS:000257011400021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140915
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.Beijing Sci & Technol Univ, Res Inst Chem Def, Beijing 100083, Peoples R China
2.Dalian Inst Chem Phys, Chinese Acad Sci, Full Cell R&D Ctr, Dalian 116023, Peoples R China

Recommended Citation:
Wen, Y. H.,Cheng, J.,Xun, Y.,et al. Bifunctional redox flow battery - 2. V(III)/V(II)-L-cystine(O-2) system[J]. ELECTROCHIMICA ACTA,2008,53(20):6018-6023.
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