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Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors
- Source :
- Nanomaterials, Nanomaterials; Volume 6; Issue 11; Pages: 212, Nanomaterials, Vol 6, Iss 11, p 212 (2016)
- Publication Year :
- 2016
- Publisher :
- MDPI AG, 2016.
-
Abstract
- There is much recent interest in graphene-based composite electrode materials because of their excellent mechanical strengths, high electron mobilities, and large specific surface areas. These materials are good candidates for applications in supercapacitors. In this work, a new graphene-based electrode material for supercapacitors was fabricated by anchoring carbon dots (CDs) on reduced graphene oxide (rGO). The capacitive properties of electrodes in aqueous electrolytes were systematically studied by galvanostatic charge-discharge measurements, cyclic voltammetry, and electrochemical impedance spectroscopy. The capacitance of rGO was improved when an appropriate amount of CDs were added to the material. The CD/rGO electrode exhibited a good reversibility, excellent rate capability, fast charge transfer, and high specific capacitance in 1 M H2SO4. Its capacitance was as high as 211.9 F/g at a current density of 0.5 A/g. This capacitance was 74.3% higher than that of a pristine rGO electrode (121.6 F/g), and the capacitance of the CD/rGO electrode retained 92.8% of its original value after 1000 cycles at a CDs-to-rGO ratio of 5:1.
- Subjects :
- Materials science
General Chemical Engineering
Oxide
Nanotechnology
02 engineering and technology
010402 general chemistry
Electrochemistry
01 natural sciences
Capacitance
Article
law.invention
lcsh:Chemistry
chemistry.chemical_compound
law
carbon dots
supercapacitors
graphene
General Materials Science
Supercapacitor
Graphene
021001 nanoscience & nanotechnology
0104 chemical sciences
Dielectric spectroscopy
lcsh:QD1-999
Chemical engineering
chemistry
Electrode
Cyclic voltammetry
0210 nano-technology
Subjects
Details
- ISSN :
- 20794991
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- Nanomaterials
- Accession number :
- edsair.doi.dedup.....4e5a1c2410b409f23e314a6e3c0556c1