用于超级电容器电极材料的MoS2/CoS2二元复合材料

MoS2/CoS2 binary composites for supercapacitor electrode materials

摘要:

采用“一步水热法”合成了不同原料配比的MoS2/CoS2二元复合材料，并研究了其用作超级电容器电极材料的电化学性能。研究结果显示，当原料中Mo: Co（摩尔比）= 2:1时（简称M2C1），该复合材料具有最优的循环稳定性能和最高的比电容，2 mV/s 扫描速度下，比电容为549 F/g或1 A/g电流密度下，比电容为434 F/g。微观结构表明，该复合材料主要由八面体形状的CoS2和花状的MoS2组成。综合分析可知，优异的电化学性能主要归因于两种组元材料的协同效应、大的比表面积以及可调控的组分含量等因素。

Abstract:

A facile one-step hydrothermal process was used to prepare MoS2/CoS2 binary composites with different raw material ratio as electrode material for supercapacitors. Results of electrochemical performances show that MoS2/CoS2 binary composites exhibit competitive specific capacitance (549 F/g at 2 mV/s or 434 F/g at 1 A/g) and excellent cycling stability as the molar ratio of Mo: Co=2:1 in raw material. And microstructure and morphology analyses reveal that the MoS2/CoS2 binary composites were composed of octahedron-shaped CoS2 and flower-liked MoS2. Above all, due to the coupling two species, large surface areas and tunable compositions, the obtained MoS2/CoS2 binary composites electrodes possess the best electrochemical properties.