Pristine graphene nanoflakes (GNFs) and those doped with nitrogen up to a level of 10.9[Formula: see text]at.% were tested as an electrode material for electrochemical double-layer supercapacitor. Doping with nitrogen increased the specific capacitance of GNFs from 88 to 180[Formula: see text]F/g. The increase results from the enhanced interaction of nitrogen-doped graphene layers with electrolyte ions.
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