Preparation of a high-capacity three-dimensional CuS/Cu2S/rGO composite thin film electrode and its application in supercapacitors

In recent years, significant progress has been made in the development of supercapacitors (SCs) for high-power applications, including electric vehicles, consumer electronics, military, and industrial uses. One crucial research area focuses on enhancing the electrochemical properties of SCs through the development of superior electrode materials. A composite electrode material (CuS/Cu 2 S/rGO) that combines Cu-sulfur compounds and graphene has been synthesized using the continuous ion layer adsorption (SILAR) method on reduced graphene thin films (rGO). The CuS/Cu 2 S/rGO film SC demonstrates exceptional electrochemical properties, attributed to the synergistic effect of CuS, Cu 2 S, and rGO. At a current density of 0.5 A g −1 , the mass-specific capacitance reaches 355.70 F g −1 , with a high energy density of 49.40 Wh kg −1 and a peak power density of 8511.49 W kg −1 . Even at an increased current density of 5 A g −1 , the mass-specific capacitance remains impressive at 239.62 F g −1 , indicating excellent rate performance. Furthermore, after 1000 constant current charge and discharge cycles, the material maintains a capacity retention rate of 87.13 %, underscoring its robust cycling stability.