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

Abstract

Manganese oxide electrodes of nanowirestructure 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 nanowirestructure (8–16 nm in diameter). Specific capacitance of the electrode reaches 350 Fg − 1 and the electrode shows a good high-rate charge/discharge capability in aqueous Na 2 SO 4 solution. Manganese oxide electrode of nanowirestructure is therefore a suitable candidate for electrochemicalcapacitor use.