Nanosheets Assembled Co<sub>3</sub>O<sub>4</sub> Nanoflowers for Supercapacitor Applications
Asma Shaheen, Shahid Hussain, Guanjun Qiao, Mohamed H. Mahmoud, Hassan Fouad, Meysam Akhtar
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.