Preparation and Electrochemical Capacitance of Ruthenium Oxide-Titania Nanotube Composite

Abstract:

A well-aligned titania nanotube array grown on titanium sheet was fabricated by an anodization process in hydrofluoric acid-phosphoric acid-ethylene glycol aqueous electrolyte. Electroactive ruthenium oxide was filled into independent titania nanotubes or deposited on the surface of planar titanium sheet by an electrodeposition-oxidation process. Electrochemical capacitances of these well-designed ruthenium oxides were investigated for supercapacitor applications. Accordingly, ruthenium oxide-titania/titanium (RuO2-TiO2/Ti) nanocomposite exhibits a much higher specific capacitance, power and energy density than ruthenium oxide/titanium (RuO2/Ti) in sulphate acid electrolyte. The utilization efficiency of RuO2 is intensively improved by introducing a novel electrode substrate with a nanotube array structure. Such a superior performance of RuO2-TiO2/Ti nanocomposite is ascribed to its highly accessible reaction sites of well-tailored RuO2 on TiO2 nanotubes.

• Periodical: Materials Science Forum (Volume 614)
• Pages: 235-241
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.614.235
• Online since: March 2009
• Authors: Yi Bing Xie, Li Min Zhou, Chuan Jun Huang, Yang Liu, Jian Lu
• Keywords: Electrochemical Capacitance, Electrodeposition-Oxidation Synthesis, Ruthenium Oxide, Titania Nanotube Array

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