Ni–Co Nanorods Decorated on MNS Nanoflowers to Form Heterostructures on Ni Foam for Fostering the Performance of Asymmetric Supercapacitors

The fabrication of composite electrodes has succeeded in boosting energy storage. This involves creating an interface through rational construction that may include doping or integration with their components. In this study, molybdenum- and nickel sulfide-based nanoflowers (MNS) coupled with Ni–Co nanorods (NiCo) constructed directly on Ni foam (MNS@NiCo NSs), which were designed to our delight via a simplistic hydrothermal technique. This technique reduced the resistance and maximized sample utilization. The entwined nanorods were spread over interconnected nanoflowers. This coupling-designed nanostructure could supply a network with plentiful mesopores to accelerate electrolyte penetration with many redox-active sites during the electrochemical process. The MNS@NiCo NS-designed mesoporous nanostructures improved the wettability by providing a higher capacitance of 455 C/g at 1 A/g. After being integrated with NiCo-nanoflowers, the MNS@NiCo NS composite delivered a higher capacitance of 505 C/g at 1 A/g. Also, the developed asymmetric supercapacitor (MNS@NiCo NSs//AC) achieved a higher energy density of 38.1 W h/kg at a power density of 775 W/kg, delivering superior cycling stability even over 5000 long cycles with a capacitance retention of 92% at a current density of 10 A/g. The noteworthy energy capability of MNS@NiCo NSs arises from the synergistic benefits of MNS nanoflowers and Ni–Co nanorods in engineering the synthesis of such potential heterostructures.