Thermal-Electric Nanogenerator Based on the Electrokinetic Effect in Porous Carbon Film
Thermal-Electric Nanogenerator Based on the Electrokinetic Effect in Porous Carbon Film
复制标题
基于多孔碳膜动电效应的热电纳米发电机
DOI：
10.1002/aenm.201702481
复制
发表时间：
2018-05-04
影响因子：
27.8
通讯作者：
Zhou, Jun
中科院分区：
文献类型：
--
作者：
Liu, Kang;Ding, Tianpeng;Zhou, Jun
将温度梯度小的低品位热能转化为电能，由于效率低、成本高而具有挑战性。本文报道了一种利用电动效应有效收集热能的新型热电纳米发电机。该纳米发电机是基于小温度梯度多孔介质中蒸发驱动的水流。用一块多孔碳膜和去离子水，在4.2℃的温差下，得到的最大开路电压为0.89 V，对应的伪塞贝克系数为210 mV K-1。巨大的伪塞贝克系数使纳米发电机有足够的功率输出，可以直接为现有的电子设备供电。此外，还展示了一种利用人体热量的可穿戴手镯纳米发电机。这种转换过程的独特性质为超低温梯度热能回收、可穿戴电子产品和自供电传感器系统提供了巨大的潜力。
Converting low-grade thermal energy with small temperature gradient into electricity is challenging due to the low efficiency and high cost. Here, a new type of thermal-electric nanogenerator is reported that utilizes electrokinetic effect for effective harvesting thermal energy. The nanogenerator is based on an evaporation-driven water flow in porous medium with small temperature gradient. With a piece of porous carbon film and deionized water, a maximum open-circuit voltage of 0.89 V under a temperature difference of 4.2 degrees C is obtained, having a corresponding pseudo-Seebeck coefficient of 210 mV K-1. The large pseudo-Seebeck coefficient endows the nanogenerator sufficient power output for powering existing electronics directly. Furthermore, a wearable bracelet nanogenerator utilizing body heat is also demonstrated. The unique properties of such conversion process offer great potential for ultra-low temperature-gradient thermal energy recovery, wearable electronics, and self-powered sensor systems.