Nitrogen-Doped Graphene:Effects of nitrogen species on the properties of the vanadium redox flow battery

Nitrogen-doped graphene nanosheets (NGS), prepared by a simple hydrothermal reaction of graphene oxide (GO) with urea as nitrogen source were studied as positive electrodes in vanadium redox flow battery (VRFB). The synthesized NGS with the nitrogen level as high as 10.12 atom% is proven to be a pro...

Full description

Saved in:
Bibliographic Details
Published inElectrochimica acta Vol. 138; pp. 93 - 100
Main Authors Shi, Lang, Liu, Suqin, He, Zhen, Shen, Junxi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 20.08.2014
Subjects
Electrode
Graphene sheets
Nitrogen doping
Vanadium redox flow battery
Nitrogen doping
Electrode
Graphene sheets
Vanadium redox flow battery
Online AccessGet full text

Cover

More Information
Summary:Nitrogen-doped graphene nanosheets (NGS), prepared by a simple hydrothermal reaction of graphene oxide (GO) with urea as nitrogen source were studied as positive electrodes in vanadium redox flow battery (VRFB). The synthesized NGS with the nitrogen level as high as 10.12 atom% is proven to be a promising material for VRFB. The structures and electrochemical properties of the materials are investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, cyclic voltammetry and electrochemical impendence spectroscopy. The results demonstrate that not only the nitrogen doping level but the nitrogen type in the NGS are significant for its catalytic activity towards the [VO]2+/[VO2]+ redox couple reaction. In more detail, among four types of nitrogen species (pyridinic-N, pyrrolic-N, quaternary-N, oxidic-N) doped into the graphene lattice, quaternary-N play mainly roles for improving the catalytic activity toward the [VO]2+/[VO2]+ couple reaction.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2014.06.099