Microwave-induced hierarchical flower-like tungsten–nickel oxide nanoarchitectures with highly porous surface features electrodes
摘要
For next-generation supercapacitor applications, the creation of robust, high energy–density electrode materials is essential. In this work, a quick and economical microwave-assisted method was used to successfully create hierarchical flower-like tungsten–nickel oxide nanoarchitectures adorned with Ag nanoparticles, and their electrochemical performance was methodically examined. The development of evenly distributed porous cauliflower/flower-like nanoarchitectures made up of linked nanosheets and nanoparticle assemblies with less agglomeration was shown by FESEM analysis. Rapid nucleation and uniform development were encouraged by the microwave irradiation technique, which produced a rough surface morphology with lots of open channels and a larger electroactive surface area. This allowed for effective ion diffusion and electrolyte penetration. In cyclic voltammetry experiments, S3 had the largest current response and the best electrochemical behavior among the synthetic samples. The improved electrode produced a high energy density of 78.77 Wh kg−1 and an outstanding specific capacitance of 2015.43 F g−1 at 1 A g−1. Additionally, it demonstrated exceptional rate capability and cycling stability by maintaining 807.13 F g−1 even at a high current density of 30 A g−1 and almost 76% capacitance retention after 5000 charge–discharge cycles. The synergistic interactions between tungsten, nickel, and silver, as well as the hierarchical porous nanoarchitecture, which enhances electrical conductivity, speeds up charge transfer kinetics, and offers a large number of active sites for redox reactions, are primarily responsible for the improved electrochemical performance. These results show that hierarchical tungsten–nickel oxide nanoarchitectures aided by microwaves are potential electrode materials for cutting-edge, high-performance energy storage devices.