Electrochemical capacitance from manganese oxide nanowire structure synthesized by cyclic voltammetric electrodeposition

Abstract

Manganese oxide electrodes of nanowire structure are electrochemically synthesized by cyclic voltammetric electrodeposition at room temperature without surfactant, catalyst, or template. Electrode morphology depends on the deposition potential, which greatly influences the electrochemical performances of the capacitor. When the deposition potential is the range of 0.1–0.6 V versus saturated calomel electrode, electrode morphology changes from nanorod (15–35 nm in diameter) to nanowire structure (8–16 nm in diameter). Specific capacitance of the electrode reaches 350Fg−1 and the electrode shows a good high-rate charge/discharge capability in aqueous Na2SO4 solution. Manganese oxide electrode of nanowire structure is therefore a suitable candidate for electrochemical capacitor use.