Cu-Ag-C@Ni3S4 with core shell structure and rose derived carbon electrode materials: An environmentally friendly supercapacitor with high energy and power density

Abstract

Transition metal sulfides (TMS) are extraordinary electrode materials for supercapacitors inasmuch as their champion stability and conductivity when paired with carbon-based materials. In this study, we report the technology of creating core-shell Cu-Ag-C@Ni3S4 (CAC-NS) nanocomposites by carbon coating and solvothermal processing of 2D Cu-Ag NWs (CA NWs). The conductive carbon covering, huge specific surface area of the nanowires, and cross-connecting Ni3S4 (P-NS) nanosheets give the CAC-NS electrode outstanding electrochemical conductivity and stable cycling behavior. Thus, high cycle performance (83% capacity retention after 5000 cycles at 20Ag-1) and specific capacitance (2507.2Fg-1 at 1Ag-1) are attributes of the CAC-NS. In contrast, the main reason why the specific capacitance of CAC-NS is higher than that of Cu-Ag-C@Ni3S4 (CA-NS) (1937.2Fg-1 at 1Ag-1) is due to the conductivity of the glucose carbon layer. A device with rose-derived carbon (RDC) and CAC-NS as the anode and cathode electrodes performs well at high current density (capacitance retention rate of 90.4% after 10000 cycles at 20Ag-1), and exhibits a large specific capacitance (366.2Fg-1 at 1Ag-1). The device (CAC-NS//RDC) can display both a high power density (4494.3Wkg-1 at 24.4Whkg-1) and a satisfactory energy density (224.8Wkg-1 at 69.8Whkg-1), suggesting that it has a wide variety of practical applications. The broad range of applications for CAC-NS nanocomposites in extremely effective supercapacitors is further illustrated by these encouraging findings.