Graphene supercapacitor breaks storage record - physicsworld.com

Graphene supercapacitor breaks storage record - physicsworld.com: "Researchers in the US have made a graphene-based supercapacitor that can store as much energy per unit mass as nickel metal hydride batteries – but unlike batteries, it can be charged or discharged in just minutes or even seconds. The new device has a specific energy density of 85.6 Wh/kg at room temperature and 136 Wh/kg at 80 °C. These are the highest ever values for 'electric double layer' supercapacitors based on carbon nanomaterials."