Abstract
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 Co
3
O
4
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 Co
3
O
4
nanoflowers of the Co
3
O
4
nanoflowers were measured by CV, GCD, and EIS. The resulting
material exhibited a specific capacitance of 3491 mF/cm
2
at a current density of 20 mA/cm
2
with good cyclic stability in 6 M KOH solution. Furthermore, the asymmetric supercapacitor assembled with Co
3
O
4
nanoflowers as a positive electrode and activated
carbon as a negative electrode showed high energy storage capacity (2102 mF/cm
2
) and good cyclic stability. Therefore, this work shows great potential of Co
3
O
4
nanoflowers as a supercapacitor cathode material.