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High surface area RuO2–TiO2 composite aerogels with different RuO2 concentrations were prepared through a modified non-alkoxide sol-gel route, followed by CO2 supercritical drying and evaluated as electrodes for energy storage devices. The TiO2 aerogels were synthesized via an ethanolic solution of TiCl3 with RuO2 being incorporated with an acidic solution of RuCl3.xH2O in different concentrations to obtain composite aerogels with 10 and 15 wt% RuO2. The aerogels were heat treated in different temperatures and characterized to evaluate the effect of the RuO2 on their specific capacitance. A specific capacitance of 25 F/g was obtained from TiO2–RuO2 aerogels containing with 10 wt% RuO2. Aerogels annealed at 450 °C exhibited lower electrochemical capacitance than the as-synthesized ones. Despite the relatively low specific capacitance, TiO2–RuO2 aerogels exhibited a remarkably high specific surface area of 316 m2/g, which make them useful for several other applications.

This work reports the one-step synthesis of bacterial nanocellulose (BNC) incorporated with polypyrrole (PPy) by chemical in situ polymerization of pyrrole (Py) using CuCl2·2H2O as both oxidant agent and functional component, varying the concentration and molar ratio. Electrical, morphological, and physical-chemical properties of these nanocomposites were investigated. The results revealed that with the increase of Py concentration and molar ratio, the nanocomposites presented traces of copper chloride and copper oxide as shown by Raman and XRD analysis. The quality of bacterial cellulose nanofibers coating by the polymer and the electrical conductivity of the nanocomposites was directly affected by those variables. The combination of the conducting polymer with the oxidant agent offers possibilities for different applications such as electronic devices and sensors.