Synergistic phase-modulated Ni(Ni2O3)/MgO nanocomposites with hierarchical porous networks for next-generation supercapacitor electrodes
摘要
A simple co-precipitation-assisted microwave irradiation approach was used to successfully create Ni(Ni2O3)/MgO nanocomposites, which were then calcined at 400 °C for two hours. The structural, morphological, and electrochemical characteristics of the synthesized samples were thoroughly examined in relation to the duration of microwave irradiation. The coexistence of crystalline MgO, Ni2O3, and metallic Ni phases was confirmed by XRD analysis, and the microwave-assisted samples showed better crystallinity and peak intensity. The successful creation of the composite framework was confirmed by FTIR spectra that showed distinctive Ni–O and Mg–O vibrational bands together with surface hydroxyl functionalities. The optimized S4 sample showed a highly porous interconnected nanoflake architecture made up of thin sheet-like domains with roughened surfaces, numerous open voids, and interconnected ion diffusion channels, according to FESEM analysis, which also showed significant morphological evolution with microwave irradiation. High surface-to-volume ratios and improved electroactive interfaces were made possible by this hierarchical architecture. The S4 electrode demonstrated outstanding rate capability and efficient charge transport properties, delivering a maximum specific capacitance of 1051 F g− 1 at 2 A g− 1 and retaining 566 F g− 1 at 20 A g− 1, according to electrochemical tests. Improved crystallinity, interconnected porosity morphology, increased electrolyte accessibility, and fast ion diffusion kinetics brought on by microwave-assisted synthesis were all shown to work in concert to produce the exceptional electrochemical performance. These findings show that Ni(Ni2O3)/MgO nanocomposites that have been microwave-engineered are viable electrode materials for high-performance supercapacitor applications.