American Chemical Society
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Dual-Phase Coexistence Design and Advanced Electrochemical Performance of Cu2MoS4 Electrode Materials for Supercapacitor Application

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journal contribution
posted on 2023-04-01, 19:43 authored by Ren Hao Xu, Pian Pian Ma, Guan Fu Liu, Yin Qiao, Rui Yang Hu, Li Yuan Liu, Muslum Demir, Guo Hua Jiang
The tetragonal layered transition metal copper–molybdenum sulfide Cu2MoS4 (CMS) possesses a high theoretical electrochemical potential because of its abundant redox properties and large layered surface area, which is favorable for ion adsorption/desorption and transport. Cu2MoS4 contains P and I phases, exhibiting different crystal structures, ion transport characteristics, and electrochemical properties accordingly. In this work, for the first time, Cu2MoS4 electrode materials with dual-phase compositions are designed and prepared for supercapacitor application, providing a synergistic effect with high electron transport efficiency and structural stability. Upon an in-depth optimization process, the optimal CMS-4 sample having P and I phases coexisting yields the optimal electrochemical behavior. The CMS-4@carbon cloth (CC) electrode provides a specific capacity of 33.9 mAh g–1 at 1 A g–1, which is 12.6 and 4.0 times higher than the pure P and I phases, respectively. The assembled MnO2@CC//CMS-4@CC supercapacitor exhibits a high energy density of 16.8 Wh kg–1 at 800 W kg–1 power density. The results demonstrate that two-phase coexistence of Cu2MoS4 significantly enhances the electrochemical activities owing to the synergistic effects of P and I phases and provides a promising material for supercapacitor negative electrodes.