High Power Factor of Ag2Se/Ag/Nylon Composite Films for Wearable Thermoelectric Devices
Nanomaterials (Basel, Switzerland)(2022)
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 mu W.m(-1) K-2 (corresponding to a ZT of similar to 0.71) at room temperature was achieved. In addition, the Ag 2 Se/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 mu W (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.
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Key words
thermoelectricity,Ag2Se,Ag,composite film,flexible device
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