Hydrothermal Synthesis of a New Kind of N-Doped Graphene Gel-like Hybrid As an Enhanced ORR Electrocatalyst

Qin Xiang; Yuping Liu; Xuefeng Zou; Bingbing Hu; Yujie Qiang; Danmei Yu; Wei Yin; Changguo Chen

doi:10.1021/acsami.7b19122

Hydrothermal Synthesis of a New Kind of N-Doped Graphene Gel-like Hybrid As an Enhanced ORR Electrocatalyst

ACS Appl Mater Interfaces. 2018 Apr 4;10(13):10842-10850. doi: 10.1021/acsami.7b19122. Epub 2018 Mar 21.

Authors

Qin Xiang¹, Yuping Liu¹, Xuefeng Zou¹, Bingbing Hu¹, Yujie Qiang¹, Danmei Yu¹, Wei Yin¹, Changguo Chen¹

Affiliation

¹ College of Chemistry and Chemical Engineering , Chongqing University , Chongqing 401331 , China.

PMID: 29547254
DOI: 10.1021/acsami.7b19122

Abstract

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.

Keywords: N-doped graphene nanosheets; g-C3N4@GO gel-like hybrids; metal-free carbon-based electrocatalyst; oxygen reduction reaction; two-dimensional materials.