Formulation of Hierarchical Nanowire-Structured CoNiO 2 and MoS 2 /CoNiO 2 Hybrid Composite Electrodes for Supercapacitor Applications

Hierarchical porous nanowire-like MoS /CoNiO nanohybrids were synthesized via the hydrothermal process. CoNiO nanowires were selected due to the edge site, high surface/volume ratio, and superior electrochemical characteristics as the porous backbone for decoration of layered MoS nanoflakes to construct innovative structure hierarchical three-dimensional (3D) porous NWs MoS /CoNiO hybrids with excellent charge accumulation and efficient ion transport capabilities. Physicochemical analyses were conducted on the developed hybrid composite, revealing conclusive evidence that the CoNiO nanowires have been securely anchored onto the surface of the MoS nanoflake array. The electrochemical results strongly proved the benefit of the hierarchical 3D porous MoS /CoNiO hybrid structure for the charge storage kinetics. The synergistic characteristics arising from the MoS /CoNiO composite yielded a notably high specific capacitance of 1340 F/g at a current density of 0.5 A/g. Furthermore, the material exhibited sustained cycling stability, retaining 95.6% of its initial capacitance after 10 000 long cycles. The asymmetric device comprising porous MoS /CoNiO //activated carbon encompassed outstanding energy density (93.02 Wh/kg at 0.85 kW/kg) and cycling stability (94.1% capacitance retention after 10 000 cycles). Additionally, the successful illumination of light-emitting diodes underscores the significant potential of the synthesized MoS /CoNiO (2D/1D) hybrid for practical high-energy storage applications.