A Novel High‐Energy Hybrid Supercapacitor with an Anatase TiO 2 –Reduced Graphene Oxide Anode and an Activated Carbon Cathode

Abstract A hybrid supercapacitor with high energy and power densities is reported. It comprises a composite anode of anatase TiO 2 and reduced graphene oxide and an activated carbon cathode in a non‐aqueous electrolyte. While intercalation compounds can provide high energy typically at the expense of power, the anatase TiO 2 nanoparticles are able to sustain both high energy and power in the hybrid supercapacitor. At a voltage range from 1.0 to 3.0 V, 42 W h kg −1 of energy is achieved at 800 W kg −1 . Even at a 4‐s charge/discharge rate, an energy density as high as 8.9 W h kg −1 can be retained. The high energy and power of this hybrid supercapacitor bridges the gap between conventional batteries with high…