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Layer-opened graphene paper with carbon nanotubes as support in a flexible electrode material for supercapacitors
- Source :
- Journal of Alloys and Compounds. 775:982-989
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- 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.
- Subjects :
- Materials science
chemistry.chemical_element
02 engineering and technology
Carbon nanotube
010402 general chemistry
01 natural sciences
law.invention
symbols.namesake
law
Specific surface area
Materials Chemistry
Graphene oxide paper
Supercapacitor
Graphene
Mechanical Engineering
Metals and Alloys
021001 nanoscience & nanotechnology
0104 chemical sciences
Dielectric spectroscopy
Chemical engineering
chemistry
Mechanics of Materials
symbols
0210 nano-technology
Raman spectroscopy
Carbon
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 775
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........a437b48e7149e73d2be615e924aa39a1