首页|Ni substitution improves the high-temperature thermoelectric performance of electronegative element Se-filled skutterudite Se0.05NixCo4-xSb12
Ni substitution improves the high-temperature thermoelectric performance of electronegative element Se-filled skutterudite Se0.05NixCo4-xSb12
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NSTL
Elsevier
? 2022 Elsevier B.V.The electronegative element-filled skutterudite (EN-SKD) has become an interesting thermoelectric material in the mid-temperature region in recent years. However, the strong intrinsic excitation above ~650 K affects its thermoelectric performance, limiting the practical applications in thermoelectric generators (TEG). To alleviate this situation, a series of EN-SKD compounds with different Ni substitutions, Se0.05NixCo4-xSb12 (x = 0.1, 0.2, 0.3, 0.4) are fabricated by solid-state reaction. It is found that the substitution of Ni for Co significantly suppresses the bipolar effect as the temperature above ~700 K due to the increase of electron concentration, reduces the lattice thermal conductivity (κL) by introducing phonon scattering centers, and consequently performs a significant enhancement of zT. Se0.05Ni0.4Co3.6Sb12 realizes a zT value two times higher than Se0.05Ni0.1Co3.9Sb12 at 823 K. This work demonstrates an approach to optimize thermoelectric performance by Ni substitution at Co sites in EN-SKD through the suppression of the bipolar effect on S and κ.
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and Engineering Beijing Institute of Technology
College of Materials Science and Engineering Shenzhen University
NSTL
Elsevier
