中文版 | English
CSpace
Realizing Enhanced Thermoelectric Performance and Hardness in Icosahedral Cu5FeS4-xSex with High-Density Twin Boundaries
Wang, Huan1; Zheng, Sikang1; Wu, Hong1; Xiong, Xin1; Xiong, Qihong1; Wang, Hengyang2; Wang, Yang1; Zhang, Bin3; Lu, Xu1; Han, Guang2
2021-11-05
摘要Bornite (Cu5FeS4) is an Earth-abundant, nontoxic thermoelectric material. Herein, twin engineering and Se alloying are combined in order to further improve its thermoelectric performance. Cu5FeS4-xSex (0 <= x <= 0.4) icosahedral nanoparticles, containing high-density twin boundaries, have been synthesized by a colloidal method. Spark plasma sintering retains twin boundaries in the pellets sintered from Cu5FeS4-xSex colloidal powders. Thermoelectric property measurement demonstrates that alloying Se increases the carrier concentration, leading to much-improved power factor in Se-substituted Cu5FeS4, for example, 0.84 mW m(-1) K-2 at 726 K for Cu5FeS3.6Se0.4; low lattice thermal conductivity is also achieved, due to intrinsic structural complexity, distorted crystal structure, and existing twin boundaries and point defects. As a result, a maximum zT of 0.75 is attained for Cu5FeS3.6Se0.4 at 726 K, which is about 23% higher than that of Cu5FeS4 and compares favorably to that of reported Cu5FeS4-based materials. In addition, the Cu5FeS4-xSex samples containing twin boundaries also obtain improved hardness compared to the ones fabricated by melting-annealing or ball milling. This work demonstrates an effective twin engineering-composition tuning strategy toward enhanced thermoelectric and mechanical properties of Cu5FeS4-based materials.
关键词Cu 5FeS (4) hardness icosahedron thermoelectric materials twin boundary
DOI10.1002/smll.202104592
发表期刊SMALL
ISSN1613-6810
页码10
通讯作者Han, Guang(guang.han@cqu.edu.cn) ; Wang, Guoyu(guoyuw@cigit.ac.cn) ; Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000714800000001
语种英语