Abstract
The method to combine thermoelectric(TE)and magnetocaloric(MC)cooling techniques lies in developing a new material that simultaneously possesses a large TE and good MC cooling performance.In this work,using n-type Bi2Te2.7Se0.3(BTS)as the TE base material and Gd as the second-phase MC material,Gd/BTS composites were prepared by the spark plasma sintering method.In the composites,interfacial reaction between Gd and BTS was identified,resulting in the formation of GdTe,which has a large impact on the electron concentration through the adjustment of defect con-centration.The MC/TE composite containing 2.5 wt％Gd exhibited a ZT value of 0.6 at 300 K,essentially retaining the original TE performance,while all the composites largely maintained the excellent MC performance of Gd.This work provides a potential pathway to achieving high performance in MC/TE composites.
基金项目
National Key Research and Development Program of China(2019YFA0704900)
National Key Research and Development Program of China(2023YFB3809400)
National Natural Science Foundation of China(52130203)
National Natural Science Foundation of China(52172232)
Basic and Applied Basic Research Foundation of Guangdong Province(2022B1515120005)
NETL
NSTL
万方数据