Fabrication of NiCo2O4@NiCo2S4 Core@Shell nanostructured arrays decorated over the rGO sheets for High-Performance asymmetric supercapacitor

Reliable and cost-effective energy storage systems can only be designed using electrode materials that exhibit high energy densities and consistency. In this work, NiCo2S4@NiCo2O4 core@shell nanoneedle-like nanostructures (NCS@NCO/rGO) are synthesized over the rGO sheet using a new and easy hydrothermal approach. Electrolyte transport and sulfur incorporation during charge-discharge reactions are both made easier by the core@shell nanostructured arrays' large active surface area. The ternary electrodes made of NCS@NCO/rGO have a rich mesoporous framework, a large surface area of 156.5 m(2)g(-1), and an ideal distribution of pore sizes centered at 8.1 nm. An impressive specific capacitance of 2011 Fg(-1) at 10 mV s(-1) demonstrates the exceptional performance of the NCS@NCO/rGO ternary electrode. The ternary electrodes made of NCS@NCO and rGO have been shown to have remarkable cyclic stability in reports, maintaining 91 % of their capacity after 10,000 cycles. With an impressive power density of 983 Wkg(-1) and an outstanding cycling durability of 98.8 % retention of the original capacitance after 10,000 cycles, the manufactured NCS@NCO/rGO//AC ACS displays a noticeable energy density of 68.5 Whkg(-1). The mesoporous structure is excellent for increasing the characteristics of supercapacitor electrodes, as these astounding results can attest.