Seeking novel and effective approaches to synergistically improve the electrical and thermal transport properties and electro-thermal conversion efficiency of Bi₂Te₃-based alloys is essential for commercial applications. Here, GdCo₂/Bi_0.37Sb_1.63Te₃ thermoelectric nanocomposites were designed and synthesized to achieve synergistic improvement of electrical and thermal properties. As confirmed by magnetoresistance measurement, the built-in magnetic field and magnetic scattering generated by magnetic nanoparticles decrease the carrier concentration and mobility, and increase the Seebeck coefficient. Meanwhile, GdCo₂ nanoparticles lead to broad-frequency phonon scattering, which effectively reduces the lattice thermal conductivity of nanocomposites. Eventually, the average ZT of the nanocomposite is increased by 18% in the range of 300–500 K, and the cooling temperature difference is increased by 68% near room temperature. This work proves that the thermoelectromagnetic coupling effects generated by magnetic particles can effectively improve the electro-thermal conversion performance.

寻求新颖和有效的方法来协同地改善Bi ₂ Te ₃基合金的电和热传输性质以及电热转换效率对于商业应用是必不可少的。在此，设计并合成了GdCo ₂ / Bi _0.37 Sb _1.63 Te ₃热电纳米复合材料，以实现电性能和热性能的协同改善。正如磁阻测量所证实的那样，内置的磁场和磁性纳米粒子产生的磁散射降低了载流子浓度和迁移率，并增加了塞贝克系数。同时，GdCo ₂纳米粒子会导致宽频声子散射，从而有效降低纳米复合材料的晶格热导率。最终，在300–500 K的范围内，纳米复合材料的平均ZT增加了18％，而在室温附近，冷却温度差增加了68％。这项工作证明了磁性颗粒产生的热电磁耦合效应可以有效地改善电热转换性能。