Lomiko Metals Inc. (TSXV:LMR,FWB:DH8B), Graphene Laboratories Inc., and Stony Brook University have produced a graphene supercapacitor prototype.
As quoted in the press release:
The prototype of the supercapacitor was made using graphene composite material prepared using a proprietary technology developed at Graphene Labs. The measured specific capacitance of the prototype was found to be around 500 Farad per gram of the material. This value is comparable with the best values reported in the literature for a supercapacitor of this type.