http://physicsworld.com/cws/article/news/44477
Well it looks more promising than Hydrogen. Would be great to be able to offload cold-weather regen onto a supercap.
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.
Well it looks more promising than Hydrogen. Would be great to be able to offload cold-weather regen onto a supercap.