Layer-opened graphene paper with carbon nanotubes as support in a flexible electrode material for supercapacitors

Graphene paper is a promising electrode material for use in flexible supercapacitors due to its good electronic conductivity and excellent mechanical characteristics. However, layers of graphene paper have a strong tendency to restack, resulting in a seriously reduced specific surface area and limit...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-02, Vol.775, p.982-989
Main Authors: Ma, Zhihua, Yang, Jie, Zhang, Jingwei, Chen, Gairong, Miao, Changqing, Shi, Lu, Wang, Liujie, Zhang, Zhijun
Format: Article
Language:English
Subjects:
Carbon
Carbon nanotubes
Composite structures
Electrochemical analysis
Electrochemical impedance spectroscopy
Electrochemical performance
Electrode materials
Electrodes
Graphene
Graphene paper
Mechanical properties
Morphology
Nanotubes
Raman spectroscopy
Scanning electron microscopy
Specific surface
Supercapacitors
Surface area
Three-dimensional layered structure
X-ray diffraction
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Summary:Graphene paper is a promising electrode material for use in flexible supercapacitors due to its good electronic conductivity and excellent mechanical characteristics. However, layers of graphene paper have a strong tendency to restack, resulting in a seriously reduced specific surface area and limited electrochemical performance. In this paper, restacked layers of graphene paper are reopened by a vacuum-assisted method, and carbon nanotubes (CNTs) are directly deposited on the enlarged space between the opened graphene layers. Consequently, an ordered carbon composite structure with alternately arranged graphene sheets and CNTs is constructed and exhibits increased specific surface area and a 3D conductive network. The structure and morphology of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy and N2 adsorption/desorption measurements. The electrochemical performance was tested by galvanostatic charge-discharge test (GDC), electrochemical impedance spectroscopy (EIS) and cyclic voltammograms (CV). The obtained graphene/CNT paper exhibits a remarkably improved capacity of 170.8 F g−1, which is nearly two times higher than that obtained for a regular graphene paper. •A unique carbonaceous structure with CNTs depositing between the opened layers of graphene is established.•The reopening of the graphene layers can enlarge the layer distance and increase the SSA.•The deposited CNTs can further inhibit the restacking of graphene layers and form a 3D conductive framework.•The prepared MGCP exhibits significantly enhanced electrochemical performance.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.10.135