Nanosheets Assembled Co3O4 Nanoflowers for Supercapacitor Applications

The energy storage has become universal concern with increasing global economy and population. Therefore, it becomes a great challenge to develop renewable energy sources to meet the increasing energy demand. We have successfully synthesized Co3O4 nanoflowers by a simple hydrothermal method for supercapacitor applications. The morphology and structure were analyzed by SEM/TEM and XRD. The electrochemical properties of the Co3O4 nanoflowers of the Co3O4 nanoflowers were measured by CV, GCD, and EIS. The resulting material exhibited a specific capacitance of 3491 mF/cm2 at a current density of 20 mA/cm2 with good cyclic stability in 6 M KOH solution. Furthermore, the asymmetric supercapacitor assembled with Co3O4 nanoflowers as a positive electrode and activated carbon as a negative electrode showed high energy storage capacity (2102 mF/cm2) and good cyclic stability. Therefore, this work shows great potential of Co3O4 nanoflowers as a supercapacitor cathode material.