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Energy & Environmental Science Vol - 4 Issue - 4

Energy & Environmental Science Vol - 4 Issue - 3

Energy & Environmental Science Vol - 4 Issue - 2

Energy & Environmental Science Vol -3

Energy & Environmental Science Vol -2

Energy & Environmental Science Vol -1

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

Content Provider	Royal Society of Chemistry (RSC)
Author	Lei, Zhibin Christov, Nikolay Zhao, X. S.
Copyright Year	2011
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.
Starting Page	1866
Ending Page	1873
Page Count	8
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	4
Issue Number	5
Journal	Energy & Environmental Science
DOI	10.1039/c1ee01094h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	MSS Three-dimensional space Mesoporous material Carbon Graphene Mesoporous silica Chemical vapor deposition Silicon dioxide Oxygen Hydrazine Redox Annealing (metallurgy) Ammonia Supercapacitor Cyclic voltammetry Electrochemistry Electrical impedance Spectroscopy Equivalent series resistance Electrode Capacitance
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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