Physical and electrochemical characterization of CuO-doped activated carbon in ionic liquid

A series of CuO-doped activated carbons (CDACs) were prepared by chemical deposition. The electrochemical behavior of CDACs was investigated in electrochemical capacitors based on ionic liquid 1-ethyl-3-methylimidazolium thiocyanate ([EMIm]SCN) as electrolyte. The results indicated that a diffusion-controlling, reversible redox reaction of CuO particles happened in ionic liquid and porous carbon. When the amount of CuO-doped activated carbon with a specific surface area of 2460 m2 g−1 reached 2%, the single electrode average specific capacitance can reach the maximal value of 210 F g−1, about 20% higher than the one used pure activated carbon as electrode material.