Preparation of graphene-hydrogel-loaded Ni Al layered double hydroxide as an electrode for supercapacitors

Abstract

cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy were used to investigate the electrochemical performance of the composites. The intriguing results inspire us to propose graphene-hydrogel-decorated materials as promising electrodes for energy storage applications. In this study, reduced graphene oxide (RGO)/Ni Al-LDH was grown on a nickel foam to create high-performance supercapacitor electrodes using a hydrothermal process. By adding RGO, the prepared RGO/Ni Al-LDH electrode attained a high specific capacity at 5 mA of approximately 1450 F/g, which is higher than that of most previously reported Ni Al-LDH-based materials. Graphene flakes were distributed on the lamellar structure through accumulation formation fold and fold, the fold and fold constitutes the concreted complete nano cavity of many open, to create a large graphene specific surface area. This kind of open pore structure allows the electrolyte ions to migrate quickly. Based on the above analysis and research, RGO/Ni Al-LDH with special architectures is a promising electrode material for hybrid supercapacitors.; In recent years, supercapacitors have attracted global attention because of their fast charge/discharge, high efficiency, long cycle life, wide temperature range, and high reliability. To exploit the potential of supercapacitors, much work has been devoted to improving the performance of the electrode materials. In this thesis, graphene-hydrogel-decorated Ni Al layered double hydroxide (LDH) was directly loaded onto nickel foam using a facile hydrothermal method. The obtained material can directly serve as an electrode for supercapacitors. Scanning electron microscopy and X-ray diffraction were employed to characterize the structure