Thermoelectric Cu<sub>12</sub>Sb<sub>4</sub>S<sub>13</sub>‐Based Synthetic Minerals with a Sublimation‐Derived Porous Network
Haihua Hu, Hua‐Lu Zhuang, Yilin Jiang, Jianlei Shi, Jingwei Li, Jingwei Li, Bowen Cai, Zhanran Han, Jun Pei, Bin Su, Zhen‐Hua Ge, Bo‐Ping Zhang, Jing‐Feng Li, Jing‐Feng Li
Abstract
Abstract Pores in a solid can effectively reduce thermal conduction, but they are not favored in thermoelectric materials due to simultaneous deterioration of electrical conductivity. Conceivably, creating a porous structure may endow thermoelectric performance enhancement provided that overwhelming reduction of electrical conductivity can be suppressed. This work demonstrates such an example, in which a porous structure is formed leading to a significant enhancement in the thermoelectric figure of merit ( zT ). By a unique BiI 3 sublimation technique, pore networks can be introduced into tetrahedrite Cu 12 Sb 4 S 13 ‐based materials, accompanied by changes in their hierarchical structures. The addition of a small quantity of BiI 3 (0.7 vol%) results in a ≈ 72% reduction in the lattice thermal conductivity, whereas the electrical conductivity is improved due to unexpected enhanced carrier mobility. As a result, an enhanced zT of 1.15 at 723 K in porous tetrahedrite and a high conversion efficiency of 6% at Δ T = 419 K in a fabricated segmented single‐leg based on this porous material are achieved. This work offers an effective way to concurrently modulate the electrical and thermal properties during the synthesis of high‐performance porous thermoelectric materials.