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Nitrogen doping is considered to be a promising way to improve the performance of graphene-based supercapacitors. It is crucial to discuss that the role of nitrogen doping in regulating the electronic properties. Herein, we chose urea, NH3·H2O and N2H4·H2O as the nitrogen sources to modify the graphene based cobalt oxide composites to compare which nitrogen source made a great improvement on the supercapacitive...
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