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The composite electrodes exhibit excellent specific capacitance, even at high scan rates.
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Description: The present application is the national phase of International Application No. PCT/US12/64261, filed Nov. 9, 2012. This application claims priority to U.S. Provisional Patent Application Nos. 61/558,182 and 61/558,187, both filed on Nov. 10, 2011.This invention was made with Government support under contract FA9451-12-1-0229 awarded by the U.S. Air Force Research Laboratory. The Government has certain rights in the invention. Background of the invention: This invention relates to supercapacitor devices. Supercapacitors, also known as ultracapacitors, are energy storage devices characterized in having very high capacitance (and therefore energy density) compared with conventional capacitors, and very high power densities compared with batteries. Due to their high capacitance and high power, supercapacitors can be effective energy storage and power supply devices for a wide variety of applications. These applications include a range of consumer electronics, wireless communication devices, electric vehicles and fuel cell vehicles. Supercapacitors are especially useful in applications in which rapid energy release and/or rapid energy capture are needed. Thus, supercapacitors are used to boost acceleration and capture braking energy in electric or hybrid vehicles.