Development of MWCNT/α-MnO2/MoS2 Ternary Composite for High-Performance Supercapacitor Application

Abstract

Development of MWCNT/α-MnO2/MoS2 ternary composite is presented in this work as an electrode material for supercapacitor application. MWCNT/α-MnO2/MoS2 ternary composite was synthesized by facile hydrothermal method. The structural details of MoS2, α-MnO2/MoS2 and MWCNT/α-MnO2/MoS2 ternary composite were studied by powder X-ray diffraction technique and nitrogen adsorption analysis. The surface morphology of the synthesized materials was analyzed by field emission electron microscope technique and the elemental analysis was carried out using EDS analysis. High-resolution transmission electron microscope analysis revealed the detailed surface analysis of MWCNT/α-MnO2/MoS2 ternary composite. The active material was mixed with a polymeric binder and drop coasted on the nickel surface and the electrochemical performances of the active material were elucidated from cyclic voltammetry, charge-discharge, and electrochemical impedance spectroscopy techniques. We observed a linear relation between the square root of the scan rate and peak current, which were confirmed the diffusion controlled ion transportation. The specific capacitance values of prepared MoS2, α-MnO2/MoS2, and MWCNT/α-MnO2/MoS2 ternary composite were calculated from charge-discharge technique at a various applied current density (1 to 5 A g-1) in 1 M Na2SO4 aqueous electrolyte. We found that the synthesized MWCNT/α-MnO2/MoS2 ternary composite electrode exhibits higher specific capacitance value than MoS2, and α-MnO2/MoS2 electrodes. Further, the resistive and capacitive behavior of the electrodes was studied from Nyquist and bode diagrams within the frequency range of 10 mHz to 100 kHz.