Wide-temperature-range thermoelectric n-type Mg3(Sb,Bi)2 with high average and peak zT values

Li，Jing Wei1; Han，Zhijia2; Yu，Jincheng1; Zhuang，Hua Lu1; Hu，Haihua1; Su，Bin1; Li，Hezhang1; Jiang，Yilin1; Chen，Lu1; Liu，Weishu2; Zheng，Qiang3; Li，Jing Feng1

2023-12-01

10.1038/s41467-023-43228-9

Nature Communications   影响因子和分区

2041-1723

Mg(Sb,Bi) is a promising thermoelectric material suited for electronic cooling, but there is still room to optimize its low-temperature performance. This work realizes >200% enhancement in room-temperature zT by incorporating metallic inclusions (Nb or Ta) into the Mg(Sb,Bi)-based matrix. The electrical conductivity is boosted in the range of 300–450 K, whereas the corresponding Seebeck coefficients remain unchanged, leading to an exceptionally high room-temperature power factor >30 μW cm K; such an unusual effect originates mainly from the modified interfacial barriers. The reduced interfacial barriers are conducive to carrier transport at low and high temperatures. Furthermore, benefiting from the reduced lattice thermal conductivity, a record-high average zT > 1.5 and a maximum zT of 2.04 at 798 K are achieved, resulting in a high thermoelectric conversion efficiency of 15%. This work demonstrates an efficient nanocomposite strategy to enhance the wide-temperature-range thermoelectric performance of n-type Mg(Sb,Bi), broadening their potential for practical applications.

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其他

2-s2.0-85177094894

Scopus

1.State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.CAS Key Laboratory of Standardization and Measurement for Nanotechnology,CAS Center for Excellence in Nanoscience,National Centre for Nanoscience and Technology,Beijing,100190,China

Li，Jing Wei,Han，Zhijia,Yu，Jincheng,et al. Wide-temperature-range thermoelectric n-type Mg3(Sb,Bi)2 with high average and peak zT values[J]. Nature Communications,2023,14(1).

Li，Jing Wei.,Han，Zhijia.,Yu，Jincheng.,Zhuang，Hua Lu.,Hu，Haihua.,...&Li，Jing Feng.(2023).Wide-temperature-range thermoelectric n-type Mg3(Sb,Bi)2 with high average and peak zT values.Nature Communications,14(1).

Li，Jing Wei,et al."Wide-temperature-range thermoelectric n-type Mg3(Sb,Bi)2 with high average and peak zT values".Nature Communications 14.1(2023).