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Ultrahigh-power micrometre-sized supercapacitors based on onion-like carbon

Pech, David and Brunet, Magali and Durou, Hugo and Huang, Peihua and Mochalin, Vadym and Gogotsi, Yury and Taberna, Pierre-Louis and Simon, Patrice Ultrahigh-power micrometre-sized supercapacitors based on onion-like carbon. (2010) Nature Nanotechnology, vol. 5 (n° 9). pp. 651-654. ISSN 1748-3387

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Official URL: http://dx.doi.org/10.1038/NNANO.2010.162

Abstract

Electrochemical capacitors, also called supercapacitors, store energy in two closely spaced layers with opposing charges, and are used to power hybrid electric vehicles, portable electronic equipment and other devices¹. By offering fast charging and discharging rates, and the ability to sustain millions of ²⁻⁵, electrochemical capacitors bridge the gap between batteries, which offer high energy densities but are slow, and conventional electrolytic capacitors, which are fast but have low energy densities. Here, we demonstrate microsupercapacitors with powers per volume that are comparable to electrolytic capacitors, capacitances that are four orders of magnitude higher, and energies per volume that are an order of magnitude higher. We also measured discharge rates of up to 200 V s⁻¹, which is three orders of magnitude higher than conventional supercapacitors. The microsupercapacitors are produced by the electrophoretic deposition of a several micrometre-thick layer of nanostructured carbon onions⁶‚⁷ with diameters of 6-7 nm. Integration of these nanoparticles in a microdevice with a high surface-to-volume ratio, without the use of organic binders and polymer separators, improves performance because of the ease with which ions can access the active material. Increasing the energy density and discharge rates of supercapacitors will enable them to compete with batteries and conventional electrolytic capacitors in a number of applications.

Item Type:Article
Additional Information:Thanks to Nature Publishing Group editor. The definitive version is available at http://www.nature.com/nnano/journal/v5/n9/full/nnano.2010.162.html
HAL Id:hal-00869530
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Drexel University (USA)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:03 Oct 2013 13:22

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