基于吸附-扩散机理研究钒离子透膜传质过程(Ⅱ)——钒离子透膜传质实验研究  

Study on the Process of Vanadium Ions Across Membrane Based on Adsorption-Diffusion Mechanism(Ⅱ)——Experiment on the Transfer of Vanadium Ions across Membrane

作　　者：陈金庆 吕宏凌[1] 王保国[2] 尹海涛[2] 

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266555 [2]清华大学化学工程系,北京100084

出　　处：《当代化工》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)

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.

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 

分 类 号：TM911.49[电气工程—电力电子与电力传动]