Ternary oxides of MnCuNi nanocomposite for enhanced supercapacitor applications

Abstract

MnO2/CuO/NiO nanocomposites were synthesized at 180 °C via a straightforward hydrothermal approach. The aqueous solutions of Mn, Cu, and Ni salts were combined with KMnO4 to produce these nanomaterials. The same molar ratios were explored to achieve mixed-oxide active materials. The resultant nanocomposites exhibited a phase blend comprising tetragonal -MnO2, monoclinic -CuO, and cubic -NiO. Specifically, the Mn:Cu:Ni nanocomposite with a 1:1:1 ratio showed an impressive specific capacitance of 754.61Fg-1 at a scan rate of 5 mVs−1 and maintained 74 % of its capacity after 5000 cycles, indicating its excellent cyclic stability. This composite electrode surpassed all individual electrodes tested, highlighting its potential as a superior electrode material for supercapacitors. Regarding its performance metrics, the areal capacitance was recorded at 108.79 mFcm−2, while the areal energy and power densities were 0.0283 mWhcm-2 and 0.315 mWcm−2, respectively. These findings signify a significant stride in the development of advanced electrode materials for supercapacitors, suggesting potential applications in other transition-metal-oxide-based electrode innovations.