Abstract
Cu-based infinite coordination polymer nanosheets were synthesized to promote the thermoelectric performance of Bi0.5Sb1.5Te3 for low-grade waste heat recovery. The diffusion of Cu into the Bi0.5Sb1.5Te3 lattice increased the carrier concentration and depressed the bipolar effect. A dramatically reduced lattice thermal conductivity was obtained due to the inclusion of multiple scales scattering centers. As a result, the average zT across the temperature range of 300 ∼ 523 K reached ∼1.08. Eventually, the single-leg device based on Bi0.5Sb1.5Te3/CuHT5-365 realized an energy conversion efficiency of ∼7% at the temperature difference of 200 K.
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