Porous Co Al-layered Double Hydroxide/ Nickel hydroxide Composite Preparation with Enhanced Capacitive Performance for Supercapacitors

Abstract

Layered double hydroxides (LDHs) as electrode-active materials have attracted immense research attention for energy storage applications. However, it is still challenging to manufacture an LDH electrode with better electrochemical performance. In this paper, the Co–Al-LDH@Ni(OH)2 composite is prepared in two steps: hydrothermal method and electrodeposition. The structure and morphology reveal prominent features of this electrode material, and the electrochemical properties are investigated by improving the conductivity and cycle stability. The experimental study mainly investigates the material properties via the deposition of different amounts of nickel hydroxide and change in the loading of the active materials. The experimental results reveal a specific capacity of 1810.5 F•g1 at a current density of 2 A/g and a cycle stability of 76% at 30 Ag1 for 3000 cycles. This study provides an advantage for the design and synthesis of LDHs, i.e., a composite, exhibiting excellent electrochemical property, with potential for applications in energy storage.