Bi-Deficiency Leading to High-Performance in Mg-3(Sb,Bi)(2)-Based Thermoelectric Materials

Li, Jing-Wei1; Liu, Weishu2; Xu, Wei3; Zhuang, Hua-Lu1; Han, Zhijia2; Jiang, Feng2; Zhang, Peng3; Hu, Haihua1; Gao, Hanbin4; Jiang, Yilin1; Cai, Bowen1; Pei, Jun1; Su, Bin1; Li, Qian1; Hayashi, Kei5; Li, Hezhang5; Miyazaki, Yuzuru5; Cao, Xingzhong3; Zheng, Qiang4; Li, Jing-Feng1

2023-04-01

10.1002/adma.202209119

ADVANCED MATERIALS   影响因子和分区

0935-9648

1521-4095

Mg-3(Sb,Bi)(2) is a potential nearly-room temperature thermoelectric compound composed of earth-abundant elements. However, complex defect tuning and exceptional microstructural control are required. Prior studies have confirmed the detrimental effect of Mg vacancies (V-Mg) in Mg-3(Sb,Bi)(2). This study proposes an approach to mitigating the negative scattering effect of V-Mg by Bi deficiency, synergistically modulating the electrical and thermal transport properties to enhance the thermoelectric performance. Positron annihilation spectrometry and C-s-corrected scanning transmission electron microscopy analyses indicated that the V-Mg tends to coalesce due to the introduced Bi vacancies (V-Bi). The defects created by Bi deficiency effectively weaken the scattering of electrons from the intrinsic V-Mg and enhance phonon scattering. A peak zT of 1.82 at 773 K and high conversion efficiency of 11.3% at increment T = 473 K are achieved in the optimized composition of Mg-3(Sb,Bi)(2) by tuning the defect combination. This work demonstrates a feasible and effective approach to improving the performance of Mg-3(Sb,Bi)(2) as an emerging thermoelectric material.

defect engineering lattice thermal conductivity Mg-3(Sb Bi)(2) thermoelectric materials

SCI ; EI

英语

NI论文

通讯

Basic Science Center Project of NSFC[51788104] ; National Key R&D Program of China[2018YFB0703603] ; Shenzhen Science and Technology Basic Research Program[GXWD20201230110313001]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000975076900001

WILEY-V C H VERLAG GMBH

20231714026303

Conversion efficiency ; Defect engineering ; High resolution transmission electron microscopy ; Thermal conductivity ; Thermal Engineering ; Thermoelectric energy conversion ; Thermoelectric equipment ; Thermoelectricity ; Tuning

Energy Conversion Issues:525.5 ; Metallurgy and Metallography:531 ; Thermoelectric Energy:615.4 ; Thermodynamics:641.1 ; Electricity: Basic Concepts and Phenomena:701.1 ; Optical Devices and Systems:741.3 ; Crystalline Solids:933.1 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
3.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
4.Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Standardizat & Measurement Nanotechnol, Beijing 100190, Peoples R China
5.Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Sendai 9808579, Japan

Li, Jing-Wei,Liu, Weishu,Xu, Wei,et al. Bi-Deficiency Leading to High-Performance in Mg-3(Sb,Bi)(2)-Based Thermoelectric Materials[J]. ADVANCED MATERIALS,2023,35(23).

Li, Jing-Wei.,Liu, Weishu.,Xu, Wei.,Zhuang, Hua-Lu.,Han, Zhijia.,...&Li, Jing-Feng.(2023).Bi-Deficiency Leading to High-Performance in Mg-3(Sb,Bi)(2)-Based Thermoelectric Materials.ADVANCED MATERIALS,35(23).

Li, Jing-Wei,et al."Bi-Deficiency Leading to High-Performance in Mg-3(Sb,Bi)(2)-Based Thermoelectric Materials".ADVANCED MATERIALS 35.23(2023).