Synthesis of three-dimensional porous reduced graphene oxide hydrogel/carbon dots for high-performance supercapacitor

A composite composed of reduced graphene oxide hydrogel/carbon dots (rGH/CDs) is prepared hydrothermally. The composite has a three-dimensional (3D) interconnected network structure and exhibits good electrical conductivity and mechanical robustness, making it ideal electrode materials in supercapac...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2018-01, Vol.808, p.321-328
Main Authors: Feng, Hange, Xie, Pei, Xue, Shaolin, Li, Lingwei, Hou, Xin, Liu, Zhiyuan, Wu, Dajun, Wang, Lianwei, Chu, Paul K.
Format: Article
Language:English
Subjects:
Capacitance
Carbon dots
CDs
Charge transfer
Chemical synthesis
Electrical resistivity
Electrode materials
Electrodes
Electron transport
Energy storage
Flexible electronics
Flux density
Graphene
Gravimetry
Hydrogels
Hydrothermal method
Nanocomposite
Nanocomposites
Porous materials
Studies
Supercapacitor
Supercapacitors
Three dimensional composites
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Summary:A composite composed of reduced graphene oxide hydrogel/carbon dots (rGH/CDs) is prepared hydrothermally. The composite has a three-dimensional (3D) interconnected network structure and exhibits good electrical conductivity and mechanical robustness, making it ideal electrode materials in supercapacitors. The carbon dots (CDs) in the reduced graphene oxide hydrogel promotes electron transport and reduces the internal resistance and charge transfer resistance in addition to providing a large surface area. The flexible solid-state supercapacitor comprising the 130μm thick rGH/CDs electrode delivers excellent performance including high gravimetric specific capacitance of 264Fg−1 (up to 301Fg−1 for a 40μm thick electrode), areal specific capacitance of 394mFcm−2 (up to 432Fcm−2 for a 200μm thick electrode), excellent cycling stability (9.1% deterioration after 5000cycles), larger energy density (35.3Whkg−1), as well as high power density (516Wkg−1). This study demonstrates the tremendous potential of rGH/CDs in high-performance flexible energy storage devices.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2017.12.046