基于氧化石墨烯薄膜的温差电能量转换及其机理研究

Thermoelectric energy conversion based on graphene oxide membranes and its mechanism research

通过基于氧化石墨烯(GO)薄膜的纳米流体系统将外部的温度梯度转换成电信号,从实验和数值模拟两个方面,系统地研究了不同条件下温差电能量转换的情况,探究了固体仿生纳米孔道在温差能上的应用.实验发现:温差发电的最大输出功率密度随着KCl浓度的增大而先上升后下降,随着温度梯度的增大而逐渐上升,随着膜厚的增大而逐渐下降.模拟研究表明,纳米孔道的离子选择性、溶液离子的扩散系数和膜电阻等直接影响最大输出功率密度与电解质浓度、温度梯度、膜厚的关系.该研究可为高性能温差电能量转换装置的结构设计提供参考.

We explore the application of solid bionic nanochannels in temperature-difference energy,which converts external temperature gradients into electrical signals through a nanofluid system based on graphene oxide(GO)membranes.From experiments and numerical simulations,we systematically studied the thermoelectric energy conversion under different conditions.The experimental results show that the maximum output power density of thermoelectric generation first increases and then decreases as the KCl concentration increases;it gradually increases with the increasing temperature gradient;and it gradually decreases as the film thickness increases.The simulation studies show that the ion selectivity of nanochannels,the diffusion coefficient of solution ions,and membrane resistance directly affect the relationships between the maximum output power density and electrolyte concentration,temperature gradient,and film thickness.This research can provide a reference in the structural design of high-performance thermoelectric energy conversion devices.