Synthesis of Amorphous Hydrous Ruthenium Dioxide for Electrochemical Capacitors

Amorphous hydrous ruthenium dioxide RuO2·xH2O was synthesized by a modified neutralization reaction and heat treatment process, and electrochemical performances of the synthesized product were investigated using the graphite plate with high conductivity as current collector. In the experiment a home-made sprayer and sodium dodecyle sulfate (SDS) were used as an assistant technique and dispersive agent, respectively. Results indicate that amorphous and high performance electrode materials with great specific area of 218 m2/g and fluffy and heavy black color morphology can be obtained after the precursor of the synthesized product is annealed at 175 °C. Cyclic voltammetry (CV) results show the prepared product is featured with good average specific capacitance (995 F/g at 1 mV/s) and excellent electrochemical rate. It is further proved by electrochemical impedance spectra (EIS) test that the prepared product has lower equivalent serial resistance of −25 mΩ and good electrochemical rate performance.