SORPTION ISOTHERMS OF VANADIUM WITH H3O-EXCHANGE MEMBRANES( IONS IN CATION)

The ion exchange of vanadium ions in different oxidation states existi ng as V2+ V3+,VO2+, VO with H3O+ across cation exchange membranes play s a certain role for the mechanism of energy loss in a vanadium redox flow battery. Ion exchange equilibria of these vanadium species with H 3O+ ions have been measured with three kinds of cation exchange membra nes using atomic absorption spectrometry as analytical tool. It turns out that a considerable amount of vanadium is soluble in the membranes which indicates that ion exchange with H3O+ ions can contribute to cr oss contamination in a vanadium redox flow battery and to correspondin g energy losses. (C) 1998 Elsevier Science B.V.