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

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.

SUBMITTER: Wu W 

PROVIDER: S-EPMC9737951 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature