High-Performance and Flexible Thermoelectric Generator Based on a Robust Carbon Nanotube/BiSbTe Foam
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Organic thermoelectric generators (TEGs) are advantageous for their flexibility and lightness, but their performance is limited by high electrical resistance and insufficient mechanical durability. In this research, we introduced a rapid solvent evaporation method to produce a robust carbon nanotube/Bi0.45Sb1.55Te3 (CNT/BST) foam with an enhanced thermoelectric figure of merit (zT). The incorporation of sub-micron BST particles within the porous CNT foam boosts the thermoelectric properties and the mechanical strength of the composite material. The CNT/BST foam achieved a zT value of 7.8 × 10−3 at 300 K, which is a 5.7-fold increase compared to the pristine CNT foam. Utilizing the CNT/BST foam, we constructed a flexible TEG that exhibited an internal resistance of 12.3 Ω and an output power of 15.7 µW with a temperature gradient of 21.8 K. This flexible TEG maintained remarkable stability and durability even after undergoing 10,000 bending cycles.