MoS2 ultrathin nanoflakes for high performance supercapacitors: room temperature chemical bath deposition (CBD)

Abstract

Homogeneous ultrathin nanoflakes of MoS₂ thin films have been successfully developed by simple and low cost room temperature chemical bath deposition (CBD) method which further applied as electrode material for high-performance supercapacitors. The surface morphological analysis revealed uniform growth of MoS₂ nanoflakes on whole substrate surface. Structural analysis confirms the formation of rhombohedral crystal structure of MoS₂. The electrochemical performances were tested by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance techniques. Different electrolytes were tested in order to find suitable electrolyte for MoS₂ thin films. In addition, the effect of electrolyte concentrations on supercapacitive properties of MoS₂ thin film was investigated. Thus, MoS₂ ultrathin nanoflakes electrode exhibits excellent electrochemical performances with maximum specific capacitance of 576 F g⁻¹ at 5 mV s⁻¹ and good cycling stability of 82% over 3000 cycles.