Abstract
Bi2Te2.7Se0.3 compound has been considered as an efficient n-type room-temperature thermoelectric (TE) material. However, the large-scale applications for low-quality energy harvesting were limited due to its low energy-conversion efficiency. We demonstrate that TE performance of Bi2Te2.7Se0.3 system is optimized by 2D Ti3C2Tx additive. Here, a 43% reduction of electrical resistivity is obtained for the nanocomposites at 380 K, originating from the increased carrier concentration. Consequently, the g = 0.1 sample shows a maximum power factor of 1.49 Wmm−1K−2. Meanwhile, the lattice thermal conductivity for nanocomposite samples is reduced from 0.77 to 0.41 Wm−1K−1 at 380 K, due to the enhanced phonon scattering induced by the interfaces between Ti3C2Tx nanosheets and Bi2Te2.7Se0.3 matrix. Therefore, a peak ZT of 0.68 is achieved at 380 K for Bi2Te2.7Se0.3/0.1 wt% Ti3C2Tx, which is enhanced by 48% compared with pristine sample. This work provides a new route for optimizing TE performance of Bi2Te2.7Se0.3 materials.
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