Supercapacitors are considered as a new class of energy storage device because of their high power density, environmentally friendliness, long cycleability, and flexible design capabilities. MnO₂ and CuS have been found to be promising for supercapacitor applications because of their low cost, abundance in nature, and are environmentally friendly. Besides this, reduced graphene oxide emerged as most promising carbon materials for energy storage applications because of its high specific surface area, good electrical conductivity, and ability to attach metal oxide without

any agglomeration. Recently, it has been reported that ternary nanocomposites have superior electrochemical performances because of their synergistic effect, which help to enhance the charge movement within the electrode material. We already reported that the specific capacitance of CuS and MnO₂ as 158 F/g and 300 F/g at current densities of 0.5 A/g, respectively [1,2]. In this work we have synthesized MnO₂/CuS/rGO ternary nanocomposite by hydrothermal method. The physical characterization of the synthesized materials was carried out using X-Ray diffraction, scanning electron microscopy, differential scanning calorimetry(DSC), and thermogravimetric analysis (TGA). All electrochemical measurements were conducted in standard three-electrode configuration, using a platinum wire, Ag/AgCl, and MnO₂/CuS/rGO as a counter, reference, and working electrode, respectively. The results related to physical characterization, specific capacitance, cycleability, and energy density will be presented.

Reference:

1. Rahul Singhal, David Thorne, Peter K. LeMaire, Xavier Martinez, Chen Zhao, Ram K. Gupta, David Uhl, Ellen Scanley, Christine C. Broadbridgeand Rakesh K. Sharma, AIP Advances 10, (2020) 035307; https://doi.org/10.1063/1.5132713.
2. Rahul Singhal, Justin Fagnoni, David Thorne, Peter K. LeMaire, Xavier Martinez, Chen Zhao, Ram K. Gupta, David Uhl, Ellen Scanley, Christine C. Broadbridge, Mani Manivannan, MRS Advances, 4 (13) 777-782 (2019), https://doi.org/10.1557/adv.2019.86