Enhancement of energy storage performance of supercapacitors based on MoS2-g-C3N4 Nanocomposite electrodes

Two-dimensional materials are extremely beneficial for supercapacitors due to their unique morphological richness, larger area, and better conductivity. In addition, layered materials have more space between them, which allows for greater charge storage as well as ion transport and storage. In the present work, a facile approach is used to fabricate bare MoS 2 and MoS 2 -g-C 3 N 4 nanocomposites as an electrode material for high-performance supercapacitor electrodes. The synthesized samples were examined by XRD, HRTEM, FESEM, FTIR, and RAMAN Spectroscopy. From structural investigations, the sample was found to present both g-C 3 N 4 and MoS 2 in the same hexagonal phase. The typical porous morphology consisting of small nanorods and irregular shapes can be observed. The small peak appears at 467 cm −1 which confirms the presence of a Mo–S bond. After the sample characterization of the nanocomposites, the electrochemical performance of the as-prepared MoS 2 -g-C 3 N 4 hybrid was evaluated by cyclic voltammetric study, Galvanostatic charge/ discharge, and electrochemical impedance techniques. During the optimized study in the three-electrode system, this attractive and MoS 2 -g-C 3 N 4 nanocomposite electrode exhibits the highest specific capacitance of 836 F g −1 at a current density of 1 Ag −1 and excellent cyclic stability with 94% of capacitance retention after 5000 repeated charge–discharge cycles. Further, this composite material sample has a very lesser value of R ct compared to other samples. We have assembled a two-electrode device using MoS 2 -g-C 3 N 4 which exhibits a specific capacitance of 198 F g −1 with an energy density of 39.6 Wh kg −1 .