Designing vertically aligned porous NiCoO@MnMoO Core@Shell nanostructures for high-performance asymmetric supercapacitors.

NiCoO@MnMoO core@shell nanostructures are synthesized as electrode material using hydrothermal method for the fabrication of asymmetric supercapacitor (ASC) device. The NiCoO@MnMoO electrode shows better electrochemical performance with specific capacitance (SC) of 1821 F/g at current density of 5 A/g and cycling stability of 94%. The NiCoO@MnMoO core@shell electrode shows better SC compared to pure NiCoO and MnMoO electrodes. An ASC device is fabricated using NiCoO@MnMoO as a positive and rGO/FeO as negative electrode materials. Remarkably, the fabricated device shows a SC of 294 F/g at current density 4 A/g, with an energy density of 91.87 Wh/kg at a power density of 374.15 W/kg. The device shows good reversibility with cycling stability of 68% after 2,000 cycles. The ASC device is used to illuminate nine green color LEDs for 35 min. Therefore, the present report provides a simple method to fabricate efficient and stable energy storage devices for industrial applications.