Core-shell structured MnxCoyO4 @MoS2 composites for advanced electrodes in supercapacitors

Supercapacitors are promising environmentally friendly energy storage devices owing to their high-power density, fast charge and discharge rates, long service life , wide applicable temperature range, and green environmental protection. Electrodes largely determine superconductor performance, so it is crucial to develop electrode materials with excellent performance. In this work, Mn x Co y O 4 @MoS 2 composites were obtained by coating flake MoS 2 arrays on spherical Mn x Co y O 4 using hydrothermal and heat treatment methods. At x/y = 1:2, the Mn x Co y O 4 @MoS 2 electrode material exhibited a specific capacitance of 1422 F g −1 at 1 A g −1 , which was higher than that at x/y = 1:1 and 2:1. When assembled into an aqueous asymmetric supercapacitor , the proposed electrode material provided a specific capacitance of 131 F g −1 at 1 A g −1 . The promising cycle life of the electrode material was further illustrated by the fact that capacity retention of 85% was obtained after 5000 cycles, and the device retained a specific power of 794 W kg −1 with 46.58 Wh kg −1 . The proposed electrode material design, therefore, provides new ideas to be used in the development of advanced electrodes.