Enhanced thermoelectric properties of Mm-filled p-type (Fe, Co)Sb3 skutterudites via Co/Fe ratio regulation and extra Sb compensation

Cao，Xiaofang1; He，Mingkai2; Ma，Baopeng1; Liu，Shixuan3; Pang，Xiaohui1; Song，Mingzhen1; Zhang，Fudong1; Chao，Xiaolian1; Yang，Zupei1; Wu，Di1

2024-01-25

10.1016/j.jallcom.2023.172815

Journal of Alloys and Compounds   影响因子和分区

0925-8388

The band degeneracy thus thermoelectric performance of (Fe, Co)Sb based p-type skutterudites can be well modulated by adjusting Co/Fe ratio. Combining systematic experiments and density function theory (DFT) calculations, we revealed in this work that the variation of Co/Fe ratio could result in complicated and mutually coupled effects on the individual thermoelectric parameters (band degeneracy, band gap, Fermi level, filling limit of fillers, phonon spectrum, etc.) and that using Co/Fe ratio to improve the overall thermoelectric figure of merit is nontrivial. We eventually found that the optimal Co/Fe ratio for Mm (Misch metal) filled (Fe, Co)Sb lies at 1.3:2.7, which is somewhat off the Co/Fe = 1:3 point where the largest valence band degeneracy appears. Extra Sb was then introduced to compensate Sb volatilization for improved electrical transport performance. An overall peak figure of merit ZT of 1.06 was eventually achieved in the sample MmFeCoSb, which is among the highest ones for all reported (Fe, Co)Sb based p-type skutterudites so far.

Band structure Co/Fe ratio DFT Filling fraction Skutterudites Thermoelectrics

SCI ; EI

英语

其他

MATERIALS SCIENCE

2-s2.0-85176369924

Scopus

1.Key Laboratory for Macromolecular Science of Shaanxi Province and Shaanxi Key Laboratory for Advanced Energy Devices,School of Materials and Engineering,Shaanxi Normal University,Xi'an,710062,China
2.Department of Physics,The Chinese University of Hong Kong,999077,Hong Kong
3.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Cao，Xiaofang,He，Mingkai,Ma，Baopeng,et al. Enhanced thermoelectric properties of Mm-filled p-type (Fe, Co)Sb3 skutterudites via Co/Fe ratio regulation and extra Sb compensation[J]. Journal of Alloys and Compounds,2024,972.

Cao，Xiaofang.,He，Mingkai.,Ma，Baopeng.,Liu，Shixuan.,Pang，Xiaohui.,...&Wu，Di.(2024).Enhanced thermoelectric properties of Mm-filled p-type (Fe, Co)Sb3 skutterudites via Co/Fe ratio regulation and extra Sb compensation.Journal of Alloys and Compounds,972.

Cao，Xiaofang,et al."Enhanced thermoelectric properties of Mm-filled p-type (Fe, Co)Sb3 skutterudites via Co/Fe ratio regulation and extra Sb compensation".Journal of Alloys and Compounds 972(2024).