Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 179, Issue 5, Pages 1351-1355Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2006.01.058
Keywords
MnO2 nanowire arrays; AAO/Ti/Si substrate; electrochemical capacitor
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AAO/Ti/Si substrate was successfully synthesized by a two-step electrochemical anodization of the aluminum film on the Ti/Si substrate and then used as template to grow nanowire arrays. The ordered MnO2 nanowire arrays with about 40 nm diameters had been directly fabricated on AAO/Ti/Si substrate by direct current (DC) electrodeposition. The microstructure of the nanowire was investigated by field-emission scanning electron microscopy. transmission electron microscopy and X-ray diffraction. Their electrochemical characterization was performed using cyclic voltammetry in 0.5 M Na2SO4 aqueous solution. The synthesized MnO2 nanowires had amorphous nature until 400 degrees C. The deal capacitive behavior was obtained when the as-prepared sample was heat-treated at 200 degrees C. The specific capacitance of the electrode was about 254 F/g. (C) 2006 Elsevier Inc. All rights reserved.
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