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为指导高性能钒电池隔膜材料选择和制备,研究VO2+/H+体系在阳离子交换膜中的吸附平衡。引入选择性因数表征吸附平衡并考虑膜内水含量的影响,建立较高浓度时的吸附平衡关系,对3种阳离子交换膜进行吸附实验。结果表明:选择性因数的对数值与溶液中VO2+摩尔分数之间存在线性关系;吸附平衡时膜内水含量越少,VO2+在膜内的吸附量越小,选择性因数小,其中PE01膜的选择性因数最小,具有较强的阻隔VO2+的能力。溶液中H+浓度对选择性因数影响较大,H+浓度提高,VO2+选择性因数增大,VO2+相对选择性吸附增强。
In order to guide the selection and preparation of high performance vanadium battery separator material, the adsorption equilibrium of VO2 + / H + system in cation exchange membrane was studied. The selectivity factor was used to characterize the adsorption equilibrium and consider the effect of water content in the membrane. The adsorption equilibrium relationship was established at higher concentration, and the adsorption experiments of three cation exchange membranes were carried out. The results showed that there was a linear relationship between the logarithm of the selectivity factor and the VO2 + molar fraction in the solution. The lower the water content in the membrane was, the smaller the adsorption capacity of VO2 + in the membrane was and the smaller the selectivity factor was. The smallest selectivity factor, with a strong barrier VO2 + capacity. The concentration of H + in the solution had a significant effect on the selectivity factor, the H + concentration increased, the VO2 + selectivity factor increased, and the VO2 + selective adsorption increased.