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Keywords:

  • electrocatalysis;
  • nitrogen-doped graphene;
  • graphene oxide;
  • urea;
  • oxygen-reduction reaction
Thumbnail image of graphical abstract

Nitrogen-doped graphene (NG) is a promising metal-free catalyst for the oxygen-reduction reaction (ORR). A facile and low-cost synthesis of NG via the pyrolysis of graphene oxide and urea is reported. The N content in NG can be up to 7.86%, with a high percentage of graphitic N (≈24%), which gives rise to an excellent catalytic activity toward the ORR.