Nitrogen doped graphene with diamond-like bonds achieves unprecedented energy density at high power in a symmetric sustainable supercapacitor

A nitrogen-superdoped graphene with diamond-like interlayer bonds is obtained via the radical chemistry of fluorographene, affording a symmetric supercapacitor with an energy density of 200 W h L −1 at a power of 2.6 kW L −1 and 143 W h L −1 at 52 kW L −1 .