基于吸附-扩散机理研究钒离子透膜传质过程(Ⅰ)——离子膜吸附-扩散模型  

Study on the Transport Process of Vanadium Ions Across Membrane Based on Adsorption-Diffusion Mechanism(Ⅰ)——Adsorption-Diffusion Model of Ion Exchange Membrane

作　　者：陈金庆 王保国[2] 吕宏凌[1] 

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8期859-861,共3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：钒离子透膜传质是导致钒电池能量损失的关键因素之一,在分析钒离子透膜传质过程的基础上,根据离子交换膜固定电荷理论提出钒离子透膜传质的吸附-扩散模型。由膜内离子Donnan平衡,引入选择性系数研究膜内钒离子吸附过程;考虑膜面浓差电势影响,由Nernst-Planck方程描述膜内钒离子和氢离子交互传质过程,将钒离子透膜扩散过程与膜内吸附过程相关联,通过简化计算方法求解钒离子透膜扩散系数,该模型较真实地反映钒离子透膜扩散本质,可用于指导高性能钒电池隔膜快速筛选和制备。The transport process of vanadium ions across membrane in all vanadium redox flow battery（VRB） has become one of critical factors to result in energy loss of battery.In this paper,through analysis of the transport process,the adsorption-diffusion model of vanadium ions across membrane was proposed based on the fixed charge theory for ion exchange membrane.Donnan equilibrium and selectivity coefficient were applied to reveal the adsorption process of vanadium ions in membrane.The Nernst-Planck equations were introduced to describe the interdiffusions between vanadium ions and proton with the effect of concentration potential.The actual mass transfer of vanadium ions across membrane was announced by the diffusion coefficients of vanadium ions with a simplified calculation method.The adsorption-diffusion model should be applied into selection and preparation of high-performance membrane materials.

关 键 词：全钒液流电池(VRB) 吸附-扩散模型 Donnan平衡 Nernst-Planck方程 浓差电势 

分 类 号：TM911.49[电气工程—电力电子与电力传动]