Abstract: RuO₂·xH₂O/AC composite electrode, an ideal electrode of super-capacitors, was prepared. For super-capacitors used usually having lower working voltage of super-capacitors, a newly hybrid super-capacitor was developed. The capacitor was composed of a tantalum metal anode, Ta₂O₅ dielectric, 38wt% H₂SO₄ electrolyte solution and RuO₂·xH₂O /AC cathode. Test results show that the parameters of the hybrid super-capacitor are 50V, 2.1mF, the storage energy density is 1.48J/cm³, showing that it has the high storage energy density and good impedance performance and can be used in pulse power systems.

Key words: super-capacitor, RuO₂·xH₂O, specific capacitance, impedance performance