▎ 摘　　要

Reduced Graphene Oxide (rGO) doped with different nitrogen (N) concentrations (5, 10, and 15 parts in weight) were successfully synthesized via hydrothermal conditions, from graphene oxide (GO) and 3-amino-1,2,4-triazole (amitrole) to obtain N-5-rGO, N-10-rGO, and N-15-rGO. These N-doped materials were characterized and evaluated for the first time as catalysts for the oxygen reduction reaction (ORR). The physicochemical characteristics confirmed the simultaneous N-doping and reduction processes with a turbostratic re-stacking of graphene layers. Nitrogen was successfully introduced as a mix of pyridine-N, amine like-N, pyrrolic-N, and quaternary bonding species into the carbon lattice. The N content were 8.1, 9.9, and 10.5 at.% for N-5-rGO, N-10-rGO, and N-15-rGO. High catalytic activity was demonstrated in alkaline media with an onset potential of similar to 0.88 V and high current density (3.9 mA cm(-2)) for N-15-rGO, leading the ORR via the 4-electron transfer pathway. The results demonstrated that the amine like-N species enhance the ORR catalytic activity in addition to pyridinic and quaternary. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.