Preparation and electrochemical capacitance of RuO2/TiO2 nanotubes composites

In this paper, RuO₂/TiO₂ nanotubes composites were synthesized by loading various amounts of RuO₂ on TiO₂ nanotubes. The symmetric supercapacitors based on these nanocomposites were fabricated by using gel polymer PVA-H₃PO₄-H₂O as electrolyte. The electrochemical capacitance performance of the nanocomposites in these supercapacitors was investigated by current-potential responses, galvanostatic charge-discharge tests and electrochemical impedance spectroscopy. The results show that the three dimensional nanotube network of TiO₂ offers a solid support structure for active materials RuO₂, allows the active material to be readily accessible (available) for electrochemical reactions, and improves the efficiency of the active materials. A maximum specific capacitance of 1263 F/g was obtained for the RuO₂ which was loading on TiO₂ nanotubes.