Hydrothermal synthesis of MoS2 nanoparticle as an electroactive material for supercapacitor

Abstract

The global energy demand requires high energy conversion and storage devices. To increase the utility of these devices, highly efficient, stable, and cost-effective electrode materials are needed. In the present study, MoS₂ nanomaterials were synthesized using a hydrothermal process using ammonium heptamolybdate tetrahydrate as a molybdenum source and thiourea as the sulfur source. The prepared sample structure and morphology were characterized by using XRD, UV, FTIR, SEM, and EDAX. The electrochemical behavior was studied by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), galvanostatic charge–discharge analysis (GCD), and stability. The crystalline size of the prepared sample was calculated as 9.6 nm. The bands at 588 cm⁻¹ and 646 cm⁻¹ correspond to Mo-S vibrations and 898 cm⁻¹ correspond to S–S vibrations. The direct energy band gap was calculated as 2.85 eV. The EDLC supercapacitor showed a high specific capacitance of 1168.23 Fg⁻¹ for the current density 1 Ag⁻¹.