Nanocrystalline ruthenium oxide of fine mesoporosity prepared by templating for electrochemical capacitor applications

摘要

Hydrous ruthenium-oxide (RuO_xH_y) particles composed of nanocrystallites of ～5 nm in size were prepared, using hexagonal self-ordered mesoporous SiO_2 (SBA-15) as a template and RuCl_3 as the ruthenium precursor. The material has a highly mesoporous structure with a sharp distribution of fine pores of size around 3-4nm. A high specific capacitance of 954Fg~(-1) for the RuO_xH_y in 1 M H_2SO_4(aq) and a high energy density of 118.9Jg~(-1) (or 32.7Whkg~-(1)) were obtained from an electrochemical capacitor made with the material. Rectangular shape of the cyclic voltammetry was observed even increasing the scan rate to about 100 mV s~(-1).