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Enhanced Thermoelectric Performance in SmMg2Bi2 via Ca-Alloying and Ge-Doping

文献类型：期刊论文

作者Huo, Yufeng1,2; Xiao, Shijuan3,4; Dai, Lu1,2; Huang, Yuling3,4; Zheng, Sikang3,4; Wang, Zhiran1,2; Chen, Peng1,2; Han, Guang6; Lu, Xu3,4; Zhou, Xiaoyuan3,4,5
刊名ACS APPLIED ENERGY MATERIALS
出版日期2022-04-25
卷号5期号:4页码:5182-5190
关键词thermoelectric SmMg2Bi2 Ge-doping lattice thermal conductivity carrier concentration
ISSN号2574-0962
DOI10.1021/acsaem.2c00529
通讯作者Han, Guang(guang.han@cqu.edu.cn) ; Wang, Guoyu(guoyuw@cigit.ac.cn)
英文摘要Zintl phase compounds with a CaAl2Si2 structure are promising thermoelectric materials. In this paper, enhanced thermoelectric performance was achieved in SmMg2Bi2, a new member of AB2X2 compounds, via Ca-alloying and Ge-doping. The introduction of point defects by alloying Ca on the Sm site significantly reduces the lattice thermal conductivity, and the lowest value was achieved when the Sm/Ca molar ratio is 1:1. Doping Ge on the Bi site increases the hole concentration of the material, which successfully suppresses the bipolar effect and significantly improves the power factor (PF) in the whole temperature range. Due to the decrease of thermal conductivity and the increase of PF over 323-873 K, the peak zT value of Sm0.5Ca0.5Mg2.15Bi1.99Ge0.01 reached 0.71 at 873 K and the zTave approached 0.44, about 51 and 47% enhancement compared with the pristine sample, respectively. This work provides a thermoelectric performance optimization strategy that can be used for other AB2X2 compounds.
资助项目National Natural Science Foundation of China[11874356] ; National Natural Science Foundation of China[U21A2054] ; National Natural Science Foundation of China[52071041] ; National Natural Science Foundation of China[51772035] ; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SLH016] ; Project for Fundamental and Frontier Research in Chongqing[cstc2019jcyjjqX0002]
WOS研究方向Chemistry ; Energy & Fuels ; Materials Science
语种英语
WOS记录号WOS:000812997100001
出版者AMER CHEMICAL SOC
源URL[http://119.78.100.138/handle/2HOD01W0/16175]  
专题中国科学院重庆绿色智能技术研究院
通讯作者Han, Guang; Wang, Guoyu
作者单位1.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chongqing Univ, Coll Phys, Chongqing 401331, Peoples R China
4.Chongqing Univ, Inst Adv Interdisciplinary Studies, Chongqing 401331, Peoples R China
5.Chongqing Univ, Analyt & Testing Ctr, Chongqing 401331, Peoples R China
6.Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China
推荐引用方式
GB/T 7714		 Huo, Yufeng,Xiao, Shijuan,Dai, Lu,et al. Enhanced Thermoelectric Performance in SmMg2Bi2 via Ca-Alloying and Ge-Doping[J]. ACS APPLIED ENERGY MATERIALS,2022,5(4):5182-5190.
APA Huo, Yufeng.,Xiao, Shijuan.,Dai, Lu.,Huang, Yuling.,Zheng, Sikang.,...&Wang, Guoyu.(2022).Enhanced Thermoelectric Performance in SmMg2Bi2 via Ca-Alloying and Ge-Doping.ACS APPLIED ENERGY MATERIALS,5(4),5182-5190.
MLA Huo, Yufeng,et al."Enhanced Thermoelectric Performance in SmMg2Bi2 via Ca-Alloying and Ge-Doping".ACS APPLIED ENERGY MATERIALS 5.4(2022):5182-5190.

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来源：重庆绿色智能技术研究院

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