Self-Assembled Three-Dimensional Macroporous Co2(OH)3Cl-MnO2 Spheres Synthesized by Microwave-Assisted Method: A New Hybrid for High-Performance Asymmetric Supercapacitors

Three-dimensional (3D) Co-2(OH)(3)Cl-MnO2 hybrid sphere was first obtained through a facile solvothermal microwave-assisted synthesis method. Because of the 3D sphere structure with a flowerlike morphology built up by nanosheets, this type of hybrid accelerated ion transfer as well as the charge and simultaneously maximized the electroactivity of Co-2(OH)(3)Cl or MnO2 with a high capacitance of 942.2 F g(-1), which was greater than that of the single Co-2(OH)(3)C1 or MnO2. Meanwhile, an asymmetric supercapacitor device was assembled with the hybrid and active carbon (AC) as the positive and negative electrodes, which yielded a specific capacitance of 49.26 F g(-1) and a high energy density of 12.62 Wh kg at a power density of 679.10 W kg. In addition, the capacitance of this device retained 83.77% after 5000 cycles, which showed a well-defined, long cycle life.