Capacitive behavior of mesoporous manganese dioxide on indium–tin oxide nanowires

• Large-scale ITO nanowire array deposited with MnO2 has been synthesized.
• MnO2 in the nanowires have mesopores of 2–3 nm in diameter.
• MnO2/ITO NWs electrode shows excellent cycle life.

In this study, a novel mesoporous MnO2/ITO NWs nanocomposite is successfully fabricated by using a chemical vapor deposition on a titanium substrate, followed by electrodeposition through a lyotropic liquid crystalline with hexagonal phase and calcination in air. The heterostructure is characterized by low-angle XRD, wide-angle XRD, Raman spectroscopy, field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Electrochemical measurements are carried out by cyclic voltammetry (CV) and chronopotentiometry in a 0.5 M Na2SO4 aqueous solution. The nanocomposite exhibits a significantly enhanced electrochemical performance and higher capacitance retention ratio, as compared to mesoporous manganese oxide (MnO2) film. From charge–discharge measurements, a specific capacitance of 821 F g−1 for the nanocomposite is achieved at a discharge current density of 1 A g−1 in potential ranges from −0.1 to 0.8 V. These characteristics allow the newly fabricated hybrid electrode to be widely used for various applications.

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