纳米通道反电渗析的理论分析  

Theoretical Analysis of Reverse Electrodialysis in Nanochannel

作　　者：张力[1] 王沫然[1] 

机构地区：[1]清华大学工程力学系热科学与动力工程教育部重点实验室,北京100084

出　　处：《工程热物理学报》2015年第1期154-157,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51176089);国家重点基础研究发展计划项目(No.2013CB228301)

摘　　要：纳米通道内的反电渗析过程是一种将纳米通道两端由于浓度差造成的能量势差直接转化成电能的新方法。由于反电渗析中局部浓度随通道位置变化,壁面电荷密度也会随通道位置发生变化。本文引入双电层带电Basic-Stern模型,将壁面电荷密度与局部浓度关联,并在传统空间电荷模型的基础上,预测了反电渗析过程的电流电压曲线和电动势。修正的空间电荷模型由于引入双电层带电模型,将难以测量的物理量,如壁面电荷密度,转化为较易测得的物理量和已知的模型参数。与过去模型的对比表明修正的空间电荷模型在合理选择模型参数的条件下更符合实验结果。Reverse electrodialysis is a kind of energy conversion method that generates electricity from the free energy in salinity gradient.Due to concentration gradient along the streamwise direction,surface charge density will consequently vary along channel.In this work,we introduce the Basic-Stern model to relate the surface charge density with local concentration and predict current-voltage curve and electromotive force in the reverse electrodialysis,based on the conventional space charge model.Our modified model converts the surface charge density,which is difficult to measure,into accessible physical quantities and model parameters.Compared with the previous models,our modified model fits the experimental results better with proper parameters.

关 键 词：反电渗析 空间电荷模型 Basic-Stern模型 TMS模型 

分 类 号：TQ028.8[化学工程]