The effect of reduction time on the surface functional groups and supercapacitive performance of graphene nanosheets

Graphene nanosheets were prepared by reducing graphite oxide with hydrazine hydrate. The effects of reduction time on the structure and morphology of graphene nanosheets have been investigated. Their electrochemical performance in aqueous and organic electrolytes was also analyzed. With an increase...

Full description

Saved in:
Bibliographic Details
Published in:Carbon (New York) 2012-08, Vol.50 (10), p.3724-3730
Main Authors: Fan, Li-Zhen, Liu, Jing-Liang, Ud-Din, Rafi, Yan, Xiaoqin, Qu, Xuanhui
Format: Article
Language:English
Subjects:
Carbon
Chemistry
Cross-disciplinary physics: materials science
rheology
Electrochemistry
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
General and physical chemistry
Graphene
Hydrates
Materials science
Nanocomposites
Nanomaterials
Nanostructure
Oxides
Physics
Reduction (electrolytic)
Specific materials
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Graphene nanosheets were prepared by reducing graphite oxide with hydrazine hydrate. The effects of reduction time on the structure and morphology of graphene nanosheets have been investigated. Their electrochemical performance in aqueous and organic electrolytes was also analyzed. With an increase of reduction time, the C and N contents of graphene nanosheets increased, while the specific surface areas and the specific capacitances decreased. Changes in reduction time produced a significant effect on the numbers as well as the types of oxygen and nitrogen functionalities. The graphene nanosheets, prepared by using a reduction time of 30min have the highest specific capacitance of 192Fg−1 in a 6molL−1 KOH electrolyte. All prepared graphene nanosheets have a good rate performance and cycle stability.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2012.03.046