NiAl-Cl LDH in-situ grown on graphene oxide by a one-step hydrothermal method towards high performance cathode of supercapacitor

Abstract

To meet the demands of modern vehicles and electronic devices, an increasing number of new materials for the cathode of high-performance supercapacitors have been studied in depth. Here, GO/NA-Cl composites were successfully fabricated by in-situ grow NiAl layered double hydroxide (NiAl LDH) nanosheets on graphene oxide (GO) flakes through one-step hydrothermal procedure for the cathode of supercapacitor. The image of scanning electron microscopy (SEM) exhibited that the NiAl-Cl LDH nanosheets were evenly and vertically arranged on the GO flakes and interlaced to form a network structure, presenting a considerable surface area, which afford abundant active sites in contact with the electrolyte and alleviate the expansion of GO/NA-Cl during the process of electrochemical reaction to improve its stability. The results of electrochemical test show that the GO/NA-Cl is a typical pseudocapacitive material, which provides a prominent specific capacity of 1573 F/g at 1 A/g, and superior rate property (the rate of capacity retention is 62% even at 20 A/g). Furthermore, the GO/NA-Cl electrode shows a superior cycling life after 1000 cycles at 1 A/g with about 80% capacitance retention.