Intercalation of mesoporous carbon spheres between reduced graphene oxide sheets for preparing high-rate supercapacitor electrodes

Lei,Zhibin, Christov,Nikolay and Zhao, X. S. (2011) Intercalation of mesoporous carbon spheres between reduced graphene oxide sheets for preparing high-rate supercapacitor electrodes. Energy and Environmental Science, 4 5: 1866-1873. doi:10.1039/c1ee01094h


Author Lei,Zhibin
Christov,Nikolay
Zhao, X. S.
Title Intercalation of mesoporous carbon spheres between reduced graphene oxide sheets for preparing high-rate supercapacitor electrodes
Journal name Energy and Environmental Science   Check publisher's open access policy
ISSN 1754-5692
1754-5706
Publication date 2011-05
Sub-type Article (original research)
DOI 10.1039/c1ee01094h
Open Access Status Not Open Access
Volume 4
Issue 5
Start page 1866
End page 1873
Total pages 8
Place of publication Cambridge, England, U.K.
Publisher Royal Society of Chemistry
Collection year 2012
Language eng
Formatted abstract
A method for preparing three-dimensional (3D) carbon-based architectures consisting of mesoporous carbon spheres intercalated between graphene sheets is demonstrated in this paper. Colloidally dispersed negatively charged graphene oxide (GO) sheets strongly interacted with positively charged mesoporous silica spheres (MSS) to form a MSS-GO composite. The MSS were then used as template for replicating mesoporous carbon spheres (MCS) via a chemical vapor deposition process, during which the GO sheets were reduced to reduced graphene oxide (RGO). Removal of the silica spheres left behind a 3D hierarchical porous carbon architecture with slightly crumpled graphene sheets intercalated with MCS. The 3D carbon structure contained a low amount of oxygen (3.2% of atomic ratio of O/C) than a RGO sample (10.1%), which was prepared by using the chemical reduction method with hydrazine as the reducing agent. Thermal annealing of the 3D carbon structure in ammonia atmosphere further reduced the O/C atomic ratio to 1.6%. The capacitive performance of the samples as supercapacitor electrodes was investigated using the cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. The 3D carbon structure showed a substantially lower equivalent series resistance and a higher power capability than the RGO electrode. In addition, the 3D carbon electrode exhibited an excellent electrochemical cyclability with 94% capacitance retention after 1000 cycles of galvanostatic charge-discharge. The method demonstrated in this work opens up a new route to the preparation of 3D graphene-based architectures for supercapacitor applications.
Keyword Exfoliated Graphite Oxide
Electrochemical Capacitors
Aqueous Dispersions
Energy-Storage
Performance
Nanosheets
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ
Additional Notes First published on the web 09 Apr 2011

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Non HERDC
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 191 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 196 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 20 Oct 2011, 10:32:37 EST by System User on behalf of School of Chemical Engineering