The electric double-layer capacitors (EDLCs), which are based on high surface area carbon materials, often suffer from low energy densities[1]. To improve energy densities, much effort has been devoted to investigating pseudo-capacitive transition-metal oxides. Nickel oxide (NiO) is considered to be a promising alternative candidate for electrode materials in redox electrochemical capacitors (ECs) because of its low cost and excellent electrochemical reaction reactivity[2]. Consequently, it is quite worthwhile to discuss the electrochemical behavior of the NiO/ activated carbon(AC) composite electrode on ECs.
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