Novel nitrogen-doped rGO loaded NiAg porous carbon materials structural composition for electrochemical supercapacitors

Nitrogen-doped carbon electrode materials with porous structures loaded with metal nanoparticles are considered promising candidates for supercapacitor applications, as they enhance electron transfer and shorten ion diffusion pathways. In the synthesis of polystyrene microspheres, graphene oxide combined with Ni 2+ and Ag + is introduced and carbonized under the protection of argon gas at 900 °C. A highly defective 3D porous framework is formed, achieving reduction of graphene oxide (rGO/Ni-Ag/CP) and the formation of Ni Ag nanoparticles on the graphene oxide sheets, which act as an effective electrochemical active site. Thus, the charge storage of supercapacitors is improved to achieve high-performance capacitance characteristics. The core-shell structure with polyaniline as the shell layer was prepared via in-situ polymerization. After the second carbonization, the material (rGO/Ni-Ag/CP@CPANI) was obtained. Electrochemical analysis reveals that the material demonstrates a specific capacitance of 383.6 F g −1 at 0.5 A g −1 , with an impressive capacitance retention of 93.9 % after 10,000 cycles. The assembled symmetric supercapacitor exhibits an energy density of 15 Wh kg −1 and a power density of 6000 W kg −1 , showing its excellent performance for energy storage applications.