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 Co ∕ Al mole ratio on their microscopic form, surface area, crystallinity, and electrochemical behavior have been investigated. Co–Al LDHs with Co ∕ Al ratio of 2:1 retain a layered structure up to 160 ° C , and the electrochemically active Co sites become increasingly exposed. The material obtained after heating at 160 ° C exhibited supercapacitor behavior with a high specific capacitance of 684 F ∕ g and a good working capacity at large specific current. This material may be a potential electrode material for supercapacitors.
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Wang et al. (2005) studied this question.
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