Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
