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Entropy Engineered Cubic n-Type AgBiSe2 Alloy with High Thermoelectric Performance in Fully Extended Operating Temperature Range
Zhu, Huaxing1; Zhao, Ting1; Zhang, Bin2; An, Zibing3; Mao, Shengcheng3; Wang, Guoyu4; Han, Xiaodong3; Lu, Xu1; Zhang, Jiangwei5,6; Zhou, Xiaoyuan1,2
2020-12-21
摘要Developing high performance n-type thermoelectric (TE) materials is fundamentally important for developing high efficiency TE devices. AgBiSe2, which reveals superior n-type TE performance in a cubic phase, crystallizes in a hexagonal phase at room temperature, and typically, undergoes phase transitions to a cubic phase at a temperature above 580 K. Here, for the first time, through entropy optimization with lead-selenides (>= 9.9 mol%), the high-temperature cubic phase of AgBiSe2 is stabilized from 300 to 800 K. Furthermore, the AgBiSe2-PbSe pseudo-binary diagram is established. The resultant alloys with optimized entropy possess unique local distorted cubic lattices, which contribute low lattice thermal conductivity approaching 0.3 W m(-1) K-1 in extended operating temperature range. Consequently, a peak figure of merit zT value of approximate to 0.8 at 800 K and a record-high average zT value of 0.42 for n-type I-V-VI2 compounds are attained in pure phase cubic n-type (AgBiSe2)(1-)(x)(PbSe)(x) solid solutions. These results pave the way for developing new TE materials via entropy engineering.
关键词cubic AgBiSe (2) entropy engineering local structure distortion phase transitions thermoelectric performance
DOI10.1002/aenm.202003304
发表期刊ADVANCED ENERGY MATERIALS
ISSN1614-6832
页码9
通讯作者Lu, Xu(luxu@cqu.edu.cn) ; Zhang, Jiangwei(jwzhang@dicp.ac.cn) ; Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000600498000001
语种英语