Accurate Determination of Electrical Potential on Ion Exchange Membranes in Reverse Electrodialysis
Accurate Determination of Electrical Potential on Ion Exchange Membranes in Reverse Electrodialysis
复制标题
反向电渗析中离子交换膜电势的准确测定
作者：
Yuting Sun;Lianfa Song
反电渗析是一种很有前途的膜技术，通过控制不同盐度水流的混合来产生能量。当离子交换膜上的阳离子和阴离子在浓度差的驱动下选择性传输时，就会产生电位。准确确定iem上开发的潜力对于公平评估该技术的可行性至关重要。采用边界更新格式对固定电荷膜的能思-普朗克-泊松方程进行数值求解。通过与已有的分析方法得到的相同的多南势值，验证了该数值方法的有效性。通过与数值模拟结果的对比，对经典的Teorell-Meyer-Siever （TMS）模型的适用性进行了评价。
Reverse electrodialysis is a promising membrane technology to generate energy from controlled mixing of water streams of different salinities. Electrical potentials generate on the ion exchange membranes (IEMs) when selective transport of cations and anions across the membranes driven by concentration difference. The accurate determination of the potentials developed on the IEMs is critical to fairly assess the feasibility of the technology. The Nernst–Planck–Poisson (NPP) equations for IEMs (the membranes with fixed charge) were solved numerically with the boundary updating scheme. The validity of this numerical method was verified by the identical values of Donnan potential obtained with the well-established analytical methods. The suitability and applicability of the classic Teorell–Meyer–Siever (TMS) model were assessed by comparison to the simulation results from the numerical method.