Oxide-based ceramics could be promising thermoelectric materials because of their thermal and chemical stability at high temperature. However, their mediocre electrical conductivity or high thermal conductivity is still a challenge for the use in commercial devices. Here, we report significantly suppressed thermal conductivity in SrTiO₃-based thermoelectric ceramics via high-entropy strategy for the first time, and optimized electrical conductivity by defect engineering. In high-entropy (Ca_0.2Sr_0.2Ba_0.2Pb_0.2La_0.2)TiO₃ bulks, the minimum thermal conductivity can be 1.17 W/(m·K) at 923 K, which should be ascribed to the large lattice distortion and the huge mass fluctuation effect. The power factor can reach about 295 μW/(m·K²) by inducing oxygen vacancies. Finally, the ZT value of 0.2 can be realized at 873 K in this bulk sample. This approach proposed a new concept of high entropy into thermoelectric oxides, which could be generalized for designing high-performance thermoelectric oxides with low thermal conductivity.

氧化物基陶瓷因其在高温下的热稳定性和化学稳定性而可能成为有前途的热电材料。然而，它们的中等电导率或高热导率仍然是用于商业设备中的挑战。在这里，我们首次报告通过高熵策略显着抑制了基于SrTiO ₃的热电陶瓷的热导率，并通过缺陷工程优化了电导率。高熵（Ca _0.2 Sr _0.2 Ba _0.2 Pb _0.2 La _0.2）TiO ₃在923 K时，最小热导率可以为1.17 W /（m·K），这应归因于较大的晶格畸变和巨大的质量波动效应。通过诱导氧空位，功率因数可以达到约295μW/（m·K ²）。最后，在此批量样本中，在873 K时ZT值为0.2。这种方法提出了高熵的热电氧化物的新概念，可以推广到设计具有低导热率的高性能热电氧化物。