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Phase Tuning for Enhancing the Thermoelectric Performance of Solution-Synthesized Cu2-xS
Yang, Meiling1; Liu, Xiaofang1; Zhang, Bin2; Chen, Yao1; Wang, Hengyang1; Yu, Jian1; Wang, Guoyu3; Xu, Jingtao4; Zhou, Xiaoyuan2,5; Han, Guang1
2021-08-25
摘要Cu2S, consisting of Earth-abundant and eco-friendly elements, is a promising candidate for thermoelectric energy conversion. The stoichiometric Cu2S has intrinsically low thermal conductivity together with meagre electrical conductivity. Herein, in order to improve the electrical properties, we develop a facile solvothermal method for synthesizing a series of Cu2-xS with tunable phase compositions. With reduction in the CuCl/Na2S molar ratio in the solution precursors from 2:1 to 1.75:1, the solvothermal products transform from single-phase Cu2S into Cu2S-Cu1.96S composites, which are preserved in the hot-pressed pellets. The decreased CuCl/Na2S molar ratio results in increased room-temperature Hall carrier concentration, leading to enhanced electrical conductivity. Specifically, the pellet corresponding to the 1.75:1 CuCl/Na2S precursor ratio obtains a power factor of 8.04 mu W cm(-1) K-2 at 815 K, which is similar to 735% of the value obtained by stoichiometric Cu2S. Along with the moderate thermal conductivity, this sample achieves an enhanced zT value of 0.87 at 815 K, representing a similar to 250% increase when compared to stoichiometric Cu2S. This study demonstrates an effective strategy in enhancing the thermoelectric performance of solution-synthesized Cu2S-based materials by phase tuning.
关键词thermoelectric copper sulfide solvothermal method phase tuning copper vacancy
DOI10.1021/acsami.1c13050
发表期刊ACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
卷号13期号:33页码:39541-39549
通讯作者Zhou, Xiaoyuan(xiaoyuan2013@cqu.edu.cn) ; Han, Guang(guang.han@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000691785200058
语种英语