碳纳米管薄膜气流热电发电机性能测试分析

基于碳纳米管薄膜的热电特性,设计了一种新型的薄膜式气流热电发电机。当热气流在碳纳米管薄膜材料表面流动时,在薄膜平面内形成温度梯度,通过塞贝克效应将热能直接转换为电能。利用浮动催化化学气相沉积法制备了导电性较好的透明碳纳米管薄膜,建立了气流热电发电机实验模型,对其输出电压进行了测试。实验表明:与传统的固定热源热电发电机相比,该气流热电发电机的输出电压较高。提出了集流体动力、流固耦合换热、热电效应于一体的多物理场耦合发电机制,对该实验结果进行了解释。碳纳米管薄膜气流热电发电机容易集成加工,可解决微光机电系统的电源问题,具有广阔的应用前景和实用价值。

Measurement and analysis on performance of carbon nanotube film airflow thermoelectric generator

A novel film airflow-thermoelectric generator(TEG) is designed by utilizing the thermoelectric characteristic of carbon nanotube(CNT) film.When the thermal gas flows over the surface of CNT film,temperature gradient is generated in the material plane.The heat energy is directly converted to the electric energy by Seebeck effect.The highly conducting,transparent CNT film is synthesized by the floating catalytic chemical vapor deposition.The experimental model of airflow-TEG is established and the output voltage is measured.The experiment show that the output voltage of airflow-TEG is larger than the one of the conventional TEG driven by the immovable heat source.The multi-physical coupling power mechanism is put forward to explain the experimental results,which include the fluid dynamics,fluid-solid coupling heat exchange and thermoelectric effect.The CNT film airflow-TEG can be easily processed and integrated,and can solve the problem of power supply for the micro-optical electro-mechanical system.So it has wide application prospect and practical value.