Synthesis and electrochemical study of MoS2/MoO3 and MoS2/CNTs binary composites for supercapacitor applications
Seyoum A. Getaneh, Abdudin G. Temam, Assumpta C. Nwanya, Paul M. Ejikeme, Fabian I. Ezema
Abstract
Ultrasonication-assisted MoS 2 /MoO 3 and MoS 2 /CNT composite materials were synthesized to improve the electrochemical performance of MoS 2 . The morphological characterization of the synthesized materials, including MoS 2 , MoO 3 , carbon nanotubes (CNTs), and binary composites, was conducted using scanning electron microscopy, the structural characterization using X-ray diffraction, and the chemical characterization using Energy Dispersive X-ray spectroscopy and Raman spectroscopy. The results revealed unique structures, compositions, and crystalline arrangements of the materials. Electrochemical studies were employed to investigate the electrochemical properties of MoS 2 , MoO 3 , and their binary composites. MoS 2 /MoO 3 exhibited superior specific capacitance values compared to MoS 2 /CNTs, indicating enhanced charge storage capabilities. The MoS 2 /MoO 3 and MoS 2 /CNTs composites demonstrated superior electrochemical performance compared to individual MoS 2 and MoO 3 materials, with specific capacitances of 137.65 F/g and 62.35 F/g, respectively, at 0.5 A/g. The stability of the supercapacitor devices was assessed over an extended cycling period of 5000 cycles, each at a current load of 2 A/g. The devices demonstrated commendable capacitance stability, retaining 75.5% of their initial capacitance over the entire cycling period. The observed enhancement is attributed to the synergistic integration of MoS 2 and MoO 3 , wherein MoS 2 provides a high surface area, while MoO 3 contributes fast and reversible redox activity. This complementary interaction facilitates improved charge transfer, increased active sites, and enhanced ion diffusion within the composite architecture.