Journal
ELECTROCHIMICA ACTA
Volume 49, Issue 19, Pages 3091-3095Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2004.02.020
Keywords
vanadium redox flow battery; dissolved state; stokes radius; ion pair; complex formation with SO42- or HSO4-; polymeric form
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Stokes radii of V(IV) and V(V) species in concentrated sulfuric acid solutions were determined from their diffusion limited current densities on a rotating platinum disk electrode and the solution viscosity. In addition, V(IV) and V(V) species were estimated based on their solubility, UV-Vis spectra, and cyclic voltammetric data. The possible ion-pair formation of V(IV) cation with SO42- and/or HSO4- and the spontaneous polymerization of V(V) at a low H2SO4 concentration were discussed. (C) 2004 Elsevier Ltd. All rights reserved.
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