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

Author

Listed:
  • Jian Li

    (State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, 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
    Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, 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
    Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Lidong Chen

    (State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China)

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.

Suggested Citation

  • Jian Li & Qingfeng Song & Ruiheng Liu & Hongliang Dong & Qihao Zhang & Xun Shi & Shengqiang Bai & Lidong Chen, 2022. "Thermoelectric Performance Optimization of n-Type La 3− x Sm x Te 4 /Ni Composites via Sm Doping," Energies, MDPI, vol. 15(7), pages 1-9, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:7:p:2353-:d:778091
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    References listed on IDEAS

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