Supercapacitors prepared from melamine-based carbon

Hulicova, Denisa, Yamashita, Junya, Soneda, Yasushi, Hatori, Hiroaki and Kodama, Masaya (2005) Supercapacitors prepared from melamine-based carbon. Chemistry of Materials, 17 5: 1241-1247. doi:10.1021/cm049337g

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Author Hulicova, Denisa
Yamashita, Junya
Soneda, Yasushi
Hatori, Hiroaki
Kodama, Masaya
Title Supercapacitors prepared from melamine-based carbon
Journal name Chemistry of Materials   Check publisher's open access policy
ISSN 0897-4756
Publication date 2005
Sub-type Article (original research)
DOI 10.1021/cm049337g
Volume 17
Issue 5
Start page 1241
End page 1247
Total pages 7
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Subject 091205 Functional Materials
100708 Nanomaterials
Abstract The electrochemical performance of supercapacitors made of a carbon material with a moderate amount of nitrogen atoms embedded in a carbon matrix is reported. Melamine was polymerized in the interlayer spaces of mica and afterward carbonized at various temperatures between 650 and 1000 degreesC. Elemental analysis and an XPS study showed that the nitrogen content of samples stabilized at 250 degreesC for 4 h prior to carbonization was generally higher if compared to their nonstabilized counterparts and that the nitrogen species were located preferably at the edges of grapheme sheets. To understand the relationship between the capacitive performance and the porosity of stabilized and nonstabilized samples, the nitrogen adsorption/ desorption method was also employed. Supercapacitors with the electrodes manufactured from these carbon materials showed a very good capacitive performance in 1 M sulfuric acid. The maximum gravimetric specific capacitance of 204.8 F g(-1) was obtained from a sample carbonized at 750degreesC. Specific capacitances per surface area were also calculated, and, as a result, the stabilized samples provided higher values than the nonstabilized samples, for example, 3.66 F m(-2) for a sample stabilized and carbonized at 1000 degreesC. We associate the high values of capacitances in sulfuric acid with the pseudocapacitance that originates from an interaction between the nitrogen species and the protons of the electrolyte. This claim was verified by another measurement, where a neutral electrolyte (3 M NaCl) was used instead of sulfuric acid. We observed a decrease in capacitance with the surface area, and the values of capacitances per surface area were close to the values for activated carbons. Thus, the capacitance in NaCl can be attributed to the electrostatic interaction of ions on the double-layer rather than the pseudocapaeitive interaction.
Keyword Chemistry, Physical
Materials Science, Multidisciplinary
Activated Carbon
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
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Created: Fri, 25 Jan 2008, 16:28:14 EST