Synthesis and performances of a ZnCoO@MnMoO composite for a hybrid supercapacitor.

To overcome the disadvantages of poor intrinsic conductivity and stability of ZnCoO, a ZnCoO@MnMoO composite as an emerging pseudocapacitor electrode material with high specific capacitance, environmental friendliness, morphological diversity, and unique hierarchical structure was synthesized a simple two-step hydrothermal method. The research results indicate that the ZnCoO@MnMoO composite can present a high specific capacity of 1628 F g at a current density of 1 A g and good cycling stability with 69% capacity retention after 10 000 cycles at 10 A g. Hybrid supercapacitors (HSCs) assembled with the ZnCoO@MnMoO cathode and activated carbon anode can deliver an energy density of 48 W h kg at a power density of 695 W kg, and their capacity retention reached 61% after 8000 charge-discharge cycles at a current density of 10 A g. This could be attributed to the synergistic effect of the specific surface area and electrical conductivity enhanced by compositing ZnCoO with MnMoO. As a result, the excellent electrochemical properties show that the ZnCoO@MnMoO composite has strong application potential for high-performance supercapacitors.