Nickel-carbon capacitor (Ni-C capacitor)
The Nickel-carbon capacitor is an electrochemical hybrid capacitor in which charge and discharge can be repeated by potassium ions adsorption at the negative electrode, and by electrochemical reaction at the nickel hydroxide positive electrode. The positive electrode is comprised of nickel based materials as for alkaline batteries, and the negative electrode is comprised of carbon materials. The electrolyte used in nickel-carbon capacitor is an alkaline electrolyte as for alkaline batteries.