Augmented electrochemical capacities of microporous MoS 2 @NiO heterostructures

In this investigation, MoS 2 @NiO heterostructures are competently synthesized through a straightforward hydrothermal method to serve as an electrode material with augmented electrochemical capabilities. Variations in the concentration of MoS 2 in the composite material are explored to optimize its performance. Extensive analyses are conducted to evaluate the structural, morphological, and electrochemical attributes of the synthesized material. The most refined MoS 2 @NiO heterostructure-based electrode showcases a notable specific capacity of 419.5 C/g (1048.75 F/g) at 1 A/g, transcending MoS 2 and NiO-based electrodes by 60 % and 45 %, respectively. It is revealed that Faradic or diffusion phenomena predominate in the charge storage mechanisms. Capitalizing on the synergistic interplay between MoS 2 and NiO within the composite material, the supercapacitor with asymmetric configuration i.e. MoS 2 @NiO//graphite-activated carbon (GAC), achieves a commendable energy density of 47.43 Wh/kg at 0.825 kW/kg. Furthermore, the developed device retains approximately 80 % of its specific capacitance and around 85 % of Coulombic efficiency after 5000 cycles at 2 A/g, underscoring its robust cyclic stability.