Mixed RuO2/TiO2 uniform microspheres synthesized by low-temperature ultrasonic spray pyrolysis and their advanced electrochemical performances

Structure–Activity/Stability Correlations from the Electrochemical Dynamic Responses of Titanium Anode Coatings Formed of Ordered TiO2@RuO2Microspheres

“…The preliminary ac impedance analysis showed that these two coatings had considerably different distributions of the active sites and pore resistance throughout the coating. 26 The active sites of the coating obtained with the low USP temperature were uniformly distributed along with a much more pronounced pore resistance and distribution with respect to the high USP temperature sample with the active sites being located mostly in the interiors of the coating. These internal active sites are, however, accessible through lower pore resistance.…”

“…In an introductory investigation, the thermal treatment was found disadvantageous, since the electrochemically active surface area of the initial USP powder was considerably decreased. 26 As a result, the voltammetric behaviors of the coatings obtained at the two USP temperature extremes did not differ considerably, but their stabilities did. The preliminary ac impedance analysis showed that these two coatings had considerably different distributions of the active sites and pore resistance throughout the coating.…”

“…The main aim behind this work, in continuation of a previous investigation, 26 was to reach full correlation between the separately analyzed electrochemical performances of the USP powders and the corresponding coatings on Ti. An appropriate comparison of the results obtained from the voltammetric characterization and the polarization of the coatings in oxygen and chlorine evolution reactions, as well as the ac impedance responses of the powders and coatings in active and inactive states was performed.…”

“…Furthermore, the electrochemical investigation can be performed in the form of either a thin layer on an appropriate current collector (e.g., glassy carbon) or a coating on a Ti substrate. For the latter, the coating procedure requires a final thermal treatment at 450 • C, 23,26 in order to attain good coating adhesion. In an introductory investigation, the thermal treatment was found disadvantageous, since the electrochemically active surface area of the initial USP powder was considerably decreased.…”

Supercapacitor performances of RuO2/MWCNT, RuO2/Fullerene nanocomposites

“…Moreover, there are many studies of nanocomposites such as RuO 2 /AC, carbon aerogel/RuO 2, RuO 2 /TiO 2. Hosseini et al have presented rGO/MWCNT/RuO 2 electrode, which has high specific capacitance of 1846.3 F/g at 10 mV/s. Moreover, Hsieh et al have given the highest specific capacitance of RuO 2 .nH 2 O/MWCNT electrodes in 1 M H 2 SO 4 aqueous solution.…”