Rational Design of Co3O4 Nano-Flowers for High Performance Supercapacitors

Electrochemical performance of the electrode materials is seriously dependent on the structure and morphology of the electrode material. In this work, the nanoflower-like Co3O4 samples are successfully prepared on Ni foam via a facile hydrothermal method. The as-fabricated Co3O4 samples exhibit superior electrochemical performance with a high specific capacitance of 382.6 C g(-1) at 1 A g(-1) and excellent capacitance retention. In addition, the as-fabricated device presents a high energy density of 23.6 Wh kg(-1) at a power density of 508.6 W kg(-1) and excellent cycle stability with a capacitance retention of 81.2% after 10000 cycles, indicating a promising application as electrodes for energy storage device.