材料科学
Boosting(机器学习)
插层(化学)
催化作用
锂(药物)
纳米技术
无机化学
化学
生物化学
内分泌学
医学
计算机科学
机器学习
作者
Mengjing Jin,Guowen Sun,Yanting Wang,Junsheng Yuan,Heng Zhao,Gang Wang,Jinyuan Zhou,Erqing Xie,Xiao Jun Pan
出处
期刊:ACS Nano
[American Chemical Society]
日期:2024-01-09
卷期号:18 (3): 2017-2029
被引量:1
标识
DOI:10.1021/acsnano.3c08395
摘要
Transition metal dichalcogenides (TMDs) have been widely studied as catalysts for lithium-sulfur batteries due to their good catalytic properties. However, their poor electronic conductivity leads to slow sulfur reduction reactions. Herein, a simple Zn2+ intercalation strategy was proposed to promote the phase transition from semiconducting 2H-phase to metallic 1T-phase of MoS2. Furthermore, the Zn2+ between layers can expand the interlayer spacing of MoS2 and serve as a charge transfer bridge to promote longitudinal transport along the c-axis of electrons. DFT calculations further prove that Zn-MoS2 possesses better charge transfer ability and stronger adsorption capacity. At the same time, Zn-MoS2 exhibits excellent redox electrocatalytic performance for the conversion and decomposition of polysulfides. As expected, the lithium-sulfur battery using Zn0.12MoS2-carbon nanofibers (CNFs) as the cathode has high specific capacity (1325 mAh g-1 at 0.1 C), excellent rate performance (698 mAh g-1 at 3 C), and outstanding cycle performance (it remains 604 mAh g-1 after 700 cycles with a decay rate of 0.045% per cycle). This study provides valuable insights for improving electrocatalytic performance of lithium-sulfur batteries.
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