A simple process to prepare nitrogen-modified few-layer graphene for a supercapacitor electrode

摘要

We report a simple approach to prepare the nitrogen-modified few-layer graphene (FLG) directly from graphite flakes. With the aid of melamine, graphite flakes can be directly ultr-asoriicated into FLG in acetone. The subsequent annealing process further transforms the melamine absorbed on the surface of graphene into melon (C6N9H3)_X, which is one type of condensation product of melamine, and simultaneously dopes the graphene with nitrogen. When tested as a supercapacitor electrode, the nitrogen-modified FLG shows a much higher specific capacitance (e.g., 227 F/g at lA/g) than that of reduced graphene oxide (rGO)(e.g., 133 F/g at 1A/g).