Thermoelectric Performance Optimization of n-Type La 3− x Sm x Te 4 /Ni Composites via Sm Doping

Jian Li, Qingfeng Song, Ruiheng Liu, Hongliang Dong, Qihao Zhang, Xun Shi, Shengqiang Bai and Lidong Chen
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Jian Li: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Qingfeng Song: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Ruiheng Liu: Institute of Advanced Materials Science and Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
Hongliang Dong: Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
Qihao Zhang: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Xun Shi: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Shengqiang Bai: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Lidong Chen: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Energies, 2022, vol. 15, issue 7, 1-9

Abstract: La 3 Te 4 -based rare-earth telluride is a kind of n-type high-temperature thermoelectric (TE) material with an operational temperature of up to 1273 K, which is a promising candidate for thermoelectric generators. In this work, the Sm substitution in La 3− x Sm x Te 4 /Ni composites is reported. The electrical transport property of La 3− x Sm x Te 4 is modified by reducing carrier concentration due to the substitution of Sm 2+ for La 3+ . The electric thermal conductivity decreases by 90% due to carrier concentration reduction, which mainly contributes to a reduction in total thermal conductivity. Lattice thermal conductivity also decreases by point-defect scattering by Sm doping. Meanwhile, based on our previous study, compositing nickel improves the thermal stability of the La 3 − x Sm x Te 4 matrix. Finally, combined with carrier concentration optimization and the decreased thermal conductivity, a maximum zT of 1.1 at 1273 K and an average zT ave value of 0.8 over 600 K–1273 K were achieved in La 2.315 Sm 0.685 Te 4 /10 vol.% Ni composite, which is among the highest TE performance reported in La 3 Te 4 compounds.

Keywords: thermoelectric; lanthanum telluride; carrier concentration optimization; composite (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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