Adsorption and Diffusion of VO2+and VO2+across Cation Membrane for All-Vanadium Redox Flow Battery

被引：26

作者：

Chen, Jin-qing ^{[1
]}

Wang, Bao-guo ^{[1
]}

Yang, Ji-chu ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China

来源：

SOLVENT EXTRACTION AND ION EXCHANGE | 2009年 / 27卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Selectivity coefficient; diffusion coefficient; vanadium ions; ion exchange membranes; ION-EXCHANGE MEMBRANE; PHOTOVOLTAIC SYSTEMS; COMPOSITE MEMBRANE; COEFFICIENTS; PERFORMANCE; MONOVALENT; ISOTHERMS; SEPARATOR; STORAGE; ANIONS;

D O I：

10.1080/07366290802674614

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A method based on a selectivity coefficient and the Nernst-Planck equation is proposed to determine diffusion coefficients of vanadium ions across a cation exchange membrane in VO2+/H+ and VO2 +/H+ systems. This simplified method can be applied to high concentrations of vanadium ions. Three cation exchange membranes were studied. The logarithmic value of the selectivity coefficient was linearly dependent on the molar fraction of vanadium ions in solution. The diffusion coefficient of vanadium ions decreased with decreasing water content. The membrane with the lowest diffusion coefficient was selected as a battery separator and showed the lowest capacity loss of the studied membranes.

引用

页码：312 / 327

页数：16

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