Construction of CuCo2S4 nanoarrays on nickel foam for synergistic effects in supercapacitor electrodes

Abstract

CuCo₂S₄ sulfide is directly synthesized on nickel foam (NF) by a two-step solvothermal method. The material forms a nanoparticle array structure on conductive substrate NF. The effects of different morphologies on the electrochemical properties of the conductive and non-conductive CuCo₂S₄ substrates and the internal mechanism of different components were studied. Various microstructures show that CuCo₂S₄/NF provides a large open space and a high specific surface area due to the unique nanostructure, as well as the rich porosity of NF and the support of the overall structure, which provides a rich active site for Faraday reaction, ensures the rapid transfer of ions, and provides a larger specific capacitance for bimetal synergy. The CuCo₂S₄/NF electrode material has A particular capacitance as high as 1013.76 F g⁻¹ at 1 A g⁻¹. In addition, based on the asymmetric supercapacitor composed of CuCo₂S₄/NF as the positive electrode and activated carbon as the negative electrode, it has a high energy density of 44 Wh kg⁻¹ at a power density of 800.0 W kg⁻¹, and the stability is 88.3 % after 10,000 cycles of 8 A g⁻¹.