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Solution-Synthesized SnSe1-xSx: Dual-Functional Materials with Enhanced Electrochemical Storage and Thermoelectric Performance
Zhang, Hong1; Liu, Xiaofang1; Wang, Jiacheng2; Zhang, Bin3; Chen, Jie4; Yang, Lei4; Wang, Guoyu5; Li, Meng2; Zheng, Yujie2; Zhou, Xiaoyuan3,6
2021-08-11
摘要The exploration of materials with multifunctional properties, such as energy harvesting and storage, is crucial in integrated energy devices and technologies. Herein, through an organic-free "soft chemical" solution method, a series of dual-functional SnSe1-xSx (x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) nanoparticles have been developed toward high-performance electrochemical energy storage and thermoelectric conversion. Among the synthesized S-substituted SnSe, SnSe0.5S0.5 exhibits the highest rate capacity (546.1 mA h g(-1) at 2 A g(-1)) and the best reversible capacity (556.2 mA h g(-1) at 0.1 A g(-1) after 100 cycles), which are much enhanced compared to those of SnSe. Density functional theory calculation confirms that the composition regulation by S substitution can lower the diffusion barrier of Li+, boost the diffusion rate of Li+, and in turn enhance the electrochemical kinetics, thus increasing the Li+ storage performance. Meanwhile, partially replacing Se by S decreases the lattice thermal conductivity, leading to an improved peak zT of 0.64 at 773 K in SnSe0.9S0.1, which is enhanced compared to the value for SnSe obtained at the same temperature. This study develops a combined composition tuning-nanostructuring approach for optimizing the electrochemical and thermoelectric performance of dual-functional SnSe.
关键词SnSe1-xSx dual-functional materials lithium-ion batteries thermoelectric solution synthesis
DOI10.1021/acsami.1c10081
发表期刊ACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
卷号13期号:31页码:37201-37211
通讯作者Li, Meng(limeng@cqu.edu.cn) ; Zheng, Yujie(zhengyujie@cqu.edu.cn) ; Han, Guang(guang.han@cqu.edu.cn)
收录类别SCI
WOS记录号WOS:000685245800052
语种英语