Researchers at Rice University in the US have made a new hybrid microsupercapacitor from graphene and carbon nanotube carpets with electrochemical properties that could come in useful for portable electronics and renewable power applications. At 2.42 mWh/cm3 in an ionic liquid, the device also has twice the energy density per volume of conventional aluminium electrolytic capacitors……
http://nanotechweb.org/cws/article/tech/52057