Entropy engineering: A simple route to both p- and n-type thermoelectrics from the same parent material

Luo，Pengfei1; Mao，Yuanqing2; Li，Zhili1; Zhang，Jiye1; Luo，Jun1,3

2022-09-01

10.1016/j.mtphys.2022.100745

Materials Today Physics   影响因子和分区

2542-5293

2542-5293

Ternary half-Heusler (HH) semiconductors have been identified as excellent high-temperature thermoelectric (TE) materials, but the high thermal conductivity restricts the development and application. In this work, we report the design of the HH alloy Ti(Fe/Co/Ni)Sb with both p-type and n-type conductions from the same parent compound TiCoSb by entropy engineering. High-throughput (HTP) experiments have been first conducted to verify the formation of Ti(FeCoNi)Sb solid solution and screen the range of compositions with the best p-type and n-type thermoelectric properties by regulating the Fe/Ni ratio. The random mixing of Fe/Co/Ni on the 4c site of the HH lattice induces a large lattice distortion, leading to a significantly reduced lattice thermal conductivity. Adjusting the sample composition (Fe/Ni ratio) changes the carrier concentration, carrier type and electronic band structure simultaneously, contributing to improved TE power factors for both p- and n-type materials. As a result, a peak TE figure of merit zT of up to ∼0.56 for p-type and ∼0.49 for n-type are achieved. Our experimental results demonstrate that entropy engineering is a promising strategy to extend the composition range and tune the TE properties for HH materials, which might be a generally applicable route to improve the thermoelectric performance of other TE materials.

Entropy engineering Half-heusler Lattice thermal conductivity Thermoelectric materials Ti(Fe1/3Co1/3Ni1/3)Sb

SCI ; EI

英语

其他

National Key Research and Development Program of China[2018YFA0702100];National Key Research and Development Program of China[2018YFB0703600];National Natural Science Foundation of China[51632005];National Natural Science Foundation of China[51772186];National Natural Science Foundation of China[52072234];National Natural Science Foundation of China[U21A2054];

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000813348100001

ELSEVIER

20222412209687

Carrier concentration ; Cobalt ; Cobalt alloys ; Thermal conductivity ; Thermal Engineering ; Thermoelectric equipment ; Thermoelectricity

Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Thermoelectric Energy:615.4 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1

2-s2.0-85131453834

Scopus

1.School of Materials Science and Engineering,Shanghai University,Shanghai,200444,China
2.Department of Physics,Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Materials Genome Institute,Shanghai University,Shanghai,200444,China

Luo，Pengfei,Mao，Yuanqing,Li，Zhili,et al. Entropy engineering: A simple route to both p- and n-type thermoelectrics from the same parent material[J]. Materials Today Physics,2022,26.

Luo，Pengfei,Mao，Yuanqing,Li，Zhili,Zhang，Jiye,&Luo，Jun.(2022).Entropy engineering: A simple route to both p- and n-type thermoelectrics from the same parent material.Materials Today Physics,26.

Luo，Pengfei,et al."Entropy engineering: A simple route to both p- and n-type thermoelectrics from the same parent material".Materials Today Physics 26(2022).