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Investigations on the electrode process of concentrated V(IV)/V(V) species in a vanadium redox flow battery
Wen, YH; Zhang, HM; Qian, P; Zhao, P; Zhou, HT; Yi, BL; Zhang HM(张华民); Zhang HM(张华民)
KeywordVanadium Redox Flow Battery v(Iv)/v(v) High Concentration Electrode Process
Source PublicationACTA PHYSICO-CHIMICA SINICA
2006-04-01
Volume22Issue:4Pages:403-408
Indexed BySCI
SubtypeArticle
Department3
Funding Project303
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordSYSTEM
AbstractThe 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).
Language英语
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WOS IDWOS:000237040000003
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Cited Times:31[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/93831
Collection中国科学院大连化学物理研究所
Corresponding AuthorZhang HM(张华民); Zhang HM(张华民)
Affiliation1.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
GB/T 7714
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.
APA Wen, YH.,Zhang, HM.,Qian, P.,Zhao, P.,Zhou, HT.,...&张华民.(2006).Investigations on the electrode process of concentrated V(IV)/V(V) species in a vanadium redox flow battery.ACTA PHYSICO-CHIMICA SINICA,22(4),403-408.
MLA Wen, YH,et al."Investigations on the electrode process of concentrated V(IV)/V(V) species in a vanadium redox flow battery".ACTA PHYSICO-CHIMICA SINICA 22.4(2006):403-408.
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