【作者】 杨蓉婕； 刘珊珊； 周璘； 林星宇； 苏彬；

【Author】 Rongjie Yang;Shanshan Liu;Lin Zhou;Xingyu Lin;Bin Su;Institute of Analytical Chemistry,Department of Chemistry,Zhejiang University;Department of Biosystem and Food Chemistry,Zhejiang University;

【机构】 浙江大学化学系分析化学研究所； 浙江大学生物系统工程与食品科学学院；

【摘要】 离子选择性膜的热电响应是指当膜两侧存在温度梯度时产生膜电位的现象。本工作提出了一种新的离子选择性膜热电响应模型。为了突出膜的离子选择性,将整个膜系统分为三部分,包括膜内区域和两个扩散边界层。通过在膜内应用稳态离子传输理论,在两个膜边界建立唐南平衡,我们发现温度梯度所产生的跨膜电势（φ_M）由膜内的扩散电势(△φ_dif)和两个膜边界处的唐南电势（φ_D）组成,并详细探讨了离子选择膜的电荷密度、电解质浓度和溶液温度对热电响应的影响。模拟结果表明,当温差较小时,总膜电势主要由唐南电势决定。之后,通过阳离子选择性纳米通道膜和商品化的阳离子选择性聚合物膜的热电实验对该模型进行了验证。我们认为,本文报道的新的热电模型有利于理解热电响应机理并促进热电转换的实际应用。更多还原

【Abstract】 Thermoelectric response of ion selective membrane refers to the phenomenon that the membrane potential is generated in the presence of temperature gradient.In this work,a new thermoelectric model was proposed for ion selective membrane.In order to highlight the ionic selectivity of membrane,the entire membrane was divided into three sections,the intra-membrane region and two diffusion boundary regions.By applying the steady-state ion transport theory inside the membrane and Donnan equilibrium at the membrane boundaries,we found the thermally inducted trans-membrane potential(φ_M) was composed of the diffusion potential inside membrane((△φ_dif) and two Donnan potentials at the membrane boundaries(φ_D).The effects of the charge density of ion selective membrane,electrolyte concentration and solution temperature on the thermoelectric response were theoretically explored in detail.Numerical simulation shows that in the presence of a small temperature gradient,the Donnan potential plays a dominant role in total membrane potential.This model was confirmed experimentally with cation-selective hybrid nanochannel membrane and commercial cation-selective polymer membrane.We believe the new thermoelectric model reported herein is beneficial to understand the mechanism of thermoelectric response and promote the practical applications of thermal energy conversion.更多还原