Augmented electrochemical capacities of microporous MoS2@NiO heterostructures

Abstract

In this investigation, MoS2@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 MoS2 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 MoS2@NiO heterostructure-based electrode showcases a notable specific capacity of 419.5 C/g (1048.75 F/g) at 1 A/g, transcending MoS2 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 MoS2 and NiO within the composite material, the supercapacitor with asymmetric configuration i.e. MoS2@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.