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题名: Investigations on the electrode process of concentrated V(IV)/V(V) species in a vanadium redox flow battery
作者: Wen, YH;  Zhang, HM;  Qian, P;  Zhao, P;  Zhou, HT;  Yi, BL
通讯作者: 张华民
关键词: vanadium redox flow battery ;  V(IV)/V(V) ;  high concentration ;  electrode process
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 2006-04-01
卷: 22, 期:4, 页:403-408
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 ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The electrode process of concentrated V(IV)/V(V) species has been studied at a graphite electrode using cyclic voltammetry, linear polarization, and impedance techniques. The results have revealed that in H2SO4, solution below 2 mol . L-1 containing 2.0 mol . L-1 V(IV), the electrode process of V(IV)/V(V) is controlled by the electrochemical polarization and diffusion with poor reversibility. When the concentration of H2SO4 is above 2 mol . L-1, the electrode process of V(IV)/V(V) turns into the diffusion control with improvement of the reversibility. An increase in concentration of H2SO4 solution facilitates a decrease in impedance, whereas too high concentration of H2SO4 solution ( > 3 mol . L-1) results in a remarkable increase in the viscosity of solution leading to a large mass transportation polarization, and thus the impedance starts to increase a bit. In 3 mol . L-1 H2SO4 solution, the reversibility and kinetics of V(IV)/V(V) are improved gradually as well as the characteristics of impedance with increasing concentration of V(IV) solution. But, when the concentration of V(IV) solution exceeds 2.0 mol . L-1, the viscosity of the solution is so high that the mass transportation polarization increases considerably, resulting in the deterioration of electrochemical performance of V(IV)/V(V) species and an increase in impedance. Therefore, considering from standpoint of increasing the energy density and electrode kinetics comprehensively, the optimal concentration of H2SO4 is 3 mol . L-1 containing 1.5-2.0 mol . L-1 of V(IV).
关键词[WOS]: SYSTEM
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000237040000003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/93831
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, Full Cell R&D Ctr, Dalian 116023, Peoples R China
2.Chem Def Inst, Beijing 100083, Peoples R China

Recommended Citation:
Wen, YH,Zhang, HM,Qian, P,et al. Investigations on the electrode process of concentrated V(IV)/V(V) species in a vanadium redox flow battery[J]. ACTA PHYSICO-CHIMICA SINICA,2006,22(4):403-408.
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