Hydrothermal Synthesis of a New Kind of N‑Doped Graphene Gel-like Hybrid As an Enhanced ORR Electrocatalyst
journal contributionposted on 2018-03-16, 00:00 authored by Qin Xiang, Yuping Liu, Xuefeng Zou, Bingbing Hu, Yujie Qiang, Danmei Yu, Wei Yin, Changguo Chen
In this work, g-C3N4@GO gel-like hybrid is obtained by assembling intentionally exfoliated g-C3N4 sheets on graphene oxide (GO) sheets under a hydrothermal condition. A specific N-doping process is first designed by heating the g-C3N4@GO interlaced hybrid in vacuum to form nitrogen-doped graphene nanosheets (NGS) with high level of pyridinic-N (56.0%) and edge-rich defect structure. The prepared NGS exhibited a great electrocatalysis for oxygen reduction reaction (ORR) in terms of the activity, durability, methanol tolerance, and the reaction kinetics. And the excellent electrocatalytic performance stems from the effective N-doped sites that the nitrogen atom is successfully doped at the defective edges of graphene, and the annealing temperature can play significant role of the doping pattern and location of N. The research provides a new insight into the enhancement of electrocatalysis for ORR based on nonmetal carbons by using the novel N-doping method.
edge-rich defect structureN-doping processform nitrogen-doped graphene nanosheetsNGShydrothermal conditiongraphene oxidenonmetal carbonselectrocatalysioxygen reduction reactionnitrogen atomNew KindHydrothermal Synthesisannealing temperatureN-doped sitesmethanol toleranceelectrocatalytic performanceEnhanced ORR Electrocatalystexfoliated g-C 3 N 4 sheetsreaction kineticsdoping patterng-C 3 N 4novel N-doping method