Hydrous-ruthenium-oxide thin film electrodes prepared by cathodic electrodeposition for supercapacitors

摘要

Hydrous ruthenium oxide (RuO_2·nH_2O) thin film electrodes were fabricated by cathodic electrodeposition on titanium substrates. The surface morphological characteristics of the RuO_2·nH_2O films were examined by scanning electron microscopy, and their images show the uniform spherical grains with nanometer sizes and porous network structure of the RuO_2·nH_2O films on Ti substrate. The electrochemical performances of the composite for supercapacitors were investigated by cyclic voltammetry, electrochemical impedance spectroscopy and charge/discharge technique. The RuO_2·nH_2O films exhibit good capacitive behavior, such as high reversible characteristics, excellent cycle stability, and superior power characteristics. The maximum specific capacitance of the RuO_2·nH_2O film electrode is 786 F g~(-1) achieved with deposit mass of 0.17 mg.