摘要
吸附-扩散模型基于离子交换膜固定电荷理论,涉及离子选择性系数和透膜扩散通量,通过三种离子交换膜内VO2+吸附平衡和透膜扩散实验,由吸附-扩散模型计算钒离子透膜扩散系数,揭示钒离子透膜传质过程。膜面FT-IR红外谱揭示基膜内不饱和键及RSO3-交换能力是影响膜稳定性和VO2+膜内吸附量主要因素,膜面光滑、平整能有效地降低VO2+吸附,抑制膜内水吸附和VO2+透膜扩散。该模型能较真实揭示钒离子透膜传质过程,可快速有效的筛选电池隔膜,并指导高性能钒电池隔膜制备。
The experimental parameters of selectivity coefficient and diffusion flux are included in the adsorption-diffusion model based on the fixed charge theory in ion-exchange membrane.In this paper,three kinds of membrane and VO2＋ electrolyte were selected to obtain these parameters with the experiments of adsorption equilibrium and VO2＋ diffusion across the membranes.The diffusion coefficients of VO2＋ across membrane were calculated and the transfer process was described by using the adsorption-diffusion model.The analysis of membrane composition revealed that unsaturated bond and exchange capacity of RSO3-are critical factors of the stability and VO2＋ adsorption in membrane.The smooth and flat membrane surface inhibits effectively the adsorption of VO2＋ and water in membrane and VO2＋ transfer across membrane.The adsorption-diffusion model should present the real mass transfer of vanadium ions across membrane to effectively select membrane and guide preparation of high performance membrane for all vanadium redox flow battery.
出处
《当代化工》
CAS
2011年第9期893-895,898,共4页
Contemporary Chemical Industry
基金
国家自然科学基金资助项目(20876086)
中国石油大学(华东)引进人才博士基金项目(y0904046)
关键词
全钒液流电池(VRB)
离子交换膜
吸附平衡
扩散系数
电池性能
All vanadium redox flow battery（VRB）
Ion exchange membrane
Adsorption equilibrium
Diffusion coefficient
Battery performance
