High Power Factor of Ag2Se/Ag/Nylon Composite Films for Wearable Thermoelectric Devices

Author:

Wu WenhangORCID,Liang Zheng,Jia Meng,Li Yuwei,Guan Xiongcong,Zhan Yunfeng,Wen Jinxiu,Luo Jianyi

Abstract

A flexible thermoelectric device has been considered as a competitive candidate for powering wearable electronics. Here, we fabricated an n-type Ag2Se/Ag composite film on a flexible nylon substrate using vacuum-assisted filtration and a combination of cold and hot pressing. By optimising the Ag/Se ratio and the sequential addition and reaction time of AA, an excellent power factor of 2277.3 μW∙m−1 K−2 (corresponding to a ZT of ~0.71) at room temperature was achieved. In addition, the Ag2Se/Ag composite film exhibits remarkable flexibility, with only 4% loss and 10% loss in electrical conductivity after being bent around a rod of 4 mm radius for 1000 cycles and 2000 cycles, respectively. A seven-leg flexible thermoelectric device assembled with the optimised film demonstrates a voltage of 19 mV and a maximum power output of 3.48 μW (corresponding power density of 35.5 W m−2) at a temperature difference of 30 K. This study provides a potential path to design improved flexible TE devices.

Funder

Natural Science Foundation of Guangdong Province

National Natural Science Foundation of China

Guangdong Basis and Applied Fundamental Research Fund

Wuyi University-HKMAO Joint Research and Development Fund

Innovation and Strong School Engineering Fund of Guangdong Province

Guangdong Science and Technology Innovation Strategy Special Fund

Publisher

MDPI AG

Subject

General Materials Science,General Chemical Engineering

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