Synthesis and Electrochemical Characterization of Co–Al Layered Double Hydroxides

Co–Al layered double hydroxides (LDHs) have been synthesized by a method involving separate nucleation and aging steps. The effects of varying thermal treatment and mole ratio on their microscopic form, surface area, crystallinity, and electrochemical behavior have been investigated. Co–Al LDHs with ratio of 2:1 retain a layered structure up to , and the electrochemically active Co sites become increasingly exposed. The material obtained after heating at exhibited supercapacitor behavior with a high specific capacitance of and a good working capacity at large specific current. This material may be a potential electrode material for supercapacitors.