Abstract
Copper selenide can be used in thermoelectric applications since it has the features of a superionic conductor. Nevertheless, improving its electrical and thermal transport properties using facile fabrication is challenging. Herein, a one-stone and three-bird strategy was proposed for enhancing the thermoelectric performance of Cu2Se-based composites. Natural verdigris was used as an additive to construct a porous structure simultaneously while introducing Cu vacancies and multiscale Cu2O precipitates in the Cu2-xSe material. The carrier concentration was tailored to optimize the electrical transport properties of the bulk composites. Additionally, multiple lattice defects were generated in the bulk composites, benefiting the significantly reduced thermal conductivity. Ultimately, the Cu2Se-based composite achieved a peak ZT value of 1.25 at 873 K. This study provided a simple approach of adding a natural mineral to regulate the composition and microstructure of the material, which may be worth promoting in other systems.
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