Electrodeposited NiAl-layered double hydroxide on Co3O4 as binder-free electrode for supercapacitor

Abstract

In this study, constant-voltage, NiAl-layered double hydroxide (LDH) nanosheet arrays (NSAs) were successfully grown on Co3O4 nanowires as binder-free electrode for a supercapacitor. LDH nanosheets with a large active surface area evenly dispersed on the surface of Co3O4 nanowires to achieve fast electron transport and improve the electrochemical properties of LDH nanosheets. A high specific capacitance of 2010.91 F g−1 was exhibited at a current density of 2 A g−1, and the specific capacitance of the Co3O4@NiAl-LDH remained as high as 1454.55 F g−1 at a high current density of 40 A g−1 with a retention rate of 72.3%. An asymmetric supercapacitor (ASC) was fabricated using Co3O4 @ LDH nanosheets as the positive electrode and CNT as the negative electrode. The ASC exhibited a high energy density of 12.6 Wh kg−1, and the corresponding power density was 401.4 W kg−1. Through various experiments, it can be concluded that electrodeposited LDH nanosheets on Co3O4 nanowires show good potential as a supercapacitor electrode material.