Investigation of the device Performance in 1T and 2H Phases of MoS 2 based Symmetric Supercapacitors

MoS ₂ -based transition metal dichalcogenide electrodes have received a great deal of attention as the electrode in energy storage devices. However, the bulk phase of MoS ₂ (2H) with semiconducting nature suffers inherently low electrochemical properties due to its small surface area and electrical conductivity. Conducting phase of MoS ₂ (1T) has a relatively high surface area due to the two-dimensional lamellar structure and possess excellent hydrophilicity. In the present work, both the semiconducting and conducting phases of MoS ₂ were synthesized by the hydrothermal method. The phase purity and the crystal structure of the MoS ₂ phases were analysed by X-ray diffraction studies and FT Raman spectroscopy. The materials were employed as the electrode in symmetric supercapacitor devices in 1M KOH electrolyte. Electrochemical studies indicate that the supercapacitor device fabricated from 1T MoS ₂ exhibited a specific capacitance of 510 Fg ^− 1 which is fivefold greater than the performance of 2H MoS ₂ .