Synthesis and electrochemical properties of CuS/C-dots microflower for high-performance supercapacitor

Transition metal sulfides have recently captured the utmost attention as an energy storage device owing to their excellent electrochemical activity and conductivity. The amalgamation of carbonaceous materials along with transition metal sulfides was found to do wonders in the field of supercapacitors by amplifying the surface area, conductivity, capacitance, and stability of the active electrode material. In the present work microflower like CuS and CuS/C-dots composite was synthesized via the facile hydrothermal method. Numerous characterization techniques like XRD, SEM, TEM, XPS, and EDS were used to study the properties of the as-prepared samples. The CuS/C-dots composite as an active anode material exhibited an outstanding electrochemical performance with a superior specific capacitance of 2642 Fg−1 at a current density of 2 Ag−1. Furthermore, CuS/C-dots composite material displayed excellent capacitance retention of 58 % after 2000 cycles at a current density of 10 Ag−1. The superior charge transfer kinetics, unique structure, and conductivity of CuS/C-dots composite make it a remarkable material for electrochemical energy storage devices.