论文标题
带电动力的电荷载体的热电棘轮效应
Thermoelectric ratchet effect for charge carriers with hopping dynamics
论文作者
论文摘要
我们表明，最近观察到的离子导体的巨大塞贝克系数是由棘轮效应引起的，即邻居位点之间的激活跳跃被温度梯度纠正，从而将移动离子驱动到寒冷中。对于具有流动分子（如水或聚乙烯乙二醇）的复杂系统，具有更有效的扩散式转运机制，与分子成分的热诱导浓度梯度成正比。没有免费参数，我们的模型描述了在离子液体EMIM-TFSI和HydratedNaps上进行的实验，并且在质量上说明了具有数百美元$ k_b/e $的Seebeck系数的聚合物电解质膜。
We show that the huge Seebeck coefficients observed recently for ionic conductors, arise from a ratchet effect where activated jumps between neighbor sites are rectified by a temperature gradient, thus driving mobile ions towards the cold. For complex systems with mobile molecules like water or polyethylene glycol, there is an even more efficient diffusiophoretic transport mechanism, proportional to the thermally induced concentration gradient of the molecular component. Without free parameters, our model describes experiments on the ionic liquid EMIM-TFSI and hydratedNaPSS, and it qualitatively accounts for polymer electrolyte membranes with Seebeck coefficients of hundreds of $k_B/e$.
