Large-area radiation-modulated thermoelectric fabrics for high-performance thermal management and electricity generation

Flexible thermoelectric systems capable of converting human body heat or solar heat into sustainable electricity are crucial for the development of self-powered wearable electronics. However, challenges persist in maintaining a stable temperature gradient and enabling scalable fabrication for their commercialization. Herein, we present a facile approach involving the screen printing of large-scale carbon nanotube (CNT)-based thermoelectric arrays on conventional textile. These arrays were integrated with the radiation-modulated thermoelectric fabrics of electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) membranes for the low-cost and high-performance wearable self-power application. Combined with the excellent photothermal properties of CNTs, the resulting thermoelectric fabric (0.2 square meters) achieves a substantial ΔT of 37 kelvin under a solar intensity of ~800 watt per square meter, yielding a peak power density of 0.20 milliwatt per square meter. This study offers a pragmatic pathway to simultaneously address thermal management and electricity generation in self-powered wearable applications by efficiently harvesting solar energy.