DIP-COATED RU-V OXIDE ELECTRODES FOR ELECTROCHEMICAL CAPACITORS

RuO2-VOx electrodes prepared by a dip-coating method provide a large e lectrochemically active surface area. A RuO2(33%)-VOx(67%)/Ti electrod e calcined at 450 degrees C gave the highest value of voltammetric cha rge, about 50 times larger as that of a RuO2/Ti electrode. The large e lectrochemically active surface areas of the RuO2-VOx/Ti electrodes we re characterized by a dispersion of fine V2O5 particles as well as the formation of the ruthenium vanadium double oxide, Ru2VO6, while the p resence of ultrafine RuO2 particles cannot be ruled out. The electric charge capacity of the electrode between 0.3 and 1.1 V (vs. RHE) at a 50 mV s(-1) sweep rate corresponds to 0.76 protons contributed to the adsorption on every ruthenium ion loaded on a titanium substrate.