Capacitance of carbon-based electrical double-layer capacitors

Hengxing Ji, Xin Zhao, Zhenhua Qiao, Jeil Jung, Yanwu Zhu, Yalin Lu, Li Li Zhang (), Allan H. MacDonald and Rodney S. Ruoff ()
Additional contact information
Hengxing Ji: The University of Texas at Austin
Xin Zhao: The University of Texas at Austin
Zhenhua Qiao: The University of Texas at Austin
Jeil Jung: The University of Texas at Austin
Yanwu Zhu: University of Science and Technology of China
Yalin Lu: University of Science and Technology of China
Li Li Zhang: The University of Texas at Austin
Allan H. MacDonald: The University of Texas at Austin
Rodney S. Ruoff: The University of Texas at Austin

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract Experimental electrical double-layer capacitances of porous carbon electrodes fall below ideal values, thus limiting the practical energy densities of carbon-based electrical double-layer capacitors. Here we investigate the origin of this behaviour by measuring the electrical double-layer capacitance in one to five-layer graphene. We find that the capacitances are suppressed near neutrality, and are anomalously enhanced for thicknesses below a few layers. We attribute the first effect to quantum capacitance effects near the point of zero charge, and the second to correlations between electrons in the graphene sheet and ions in the electrolyte. The large capacitance values imply gravimetric energy storage densities in the single-layer graphene limit that are comparable to those of batteries. We anticipate that these results shed light on developing new theoretical models in understanding the electrical double-layer capacitance of carbon electrodes, and on opening up new strategies for improving the energy density of carbon-based capacitors.

Date: 2014
References: Add references at CitEc
Citations: View citations in EconPapers (7)

Downloads: (external link)
https://www.nature.com/articles/ncomms4317 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms4317

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/ncomms4317

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().