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High capacitance of coarse-grained carbide derived carbon electrodes

Dyatkin, Boris and Gogotsi, Oleksiy and Malinovskiy, Bohdan and Zozulya, Yuliya and Simon, Patrice and Gogotsi, Yury High capacitance of coarse-grained carbide derived carbon electrodes. (2016) Journal of Power Sources, vol. 306. pp. 32-41. ISSN 0378-7753

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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2015.11.099

Abstract

We report exceptional electrochemical properties of supercapacitor electrodes composed of large, granular carbide-derived carbon (CDC) particles. Using a titanium carbide (TiC) precursor, we synthesized 70–250 μm sized particles with high surface area and a narrow pore size distribution. Electrochemical cycling of these coarse-grained powders defied conventional wisdom that a small particle size is strictly required for supercapacitor electrodes and allowed high charge storage densities, rapid transport, and good rate handling ability. The material showcased capacitance above 100 F g−1 at sweep rates as high as 250 mV s−1 in organic electrolyte. 250–1000 micron thick dense CDC films with up to 80 mg cm−2 loading showed superior areal capacitances. The material significantly outperformed its activated carbon counterpart in organic electrolytes and ionic liquids. Furthermore, large internal/external surface ratio of coarse-grained carbons allowed the resulting electrodes to maintain high electrochemical stability up to 3.1 V in ionic liquid electrolyte. In addition to presenting novel insights into the electrosorption process, these coarse-grained carbons offer a pathway to low-cost, high-performance implementation of supercapacitors in automotive and grid-storage applications.

Item Type:Article
Additional Information:Thanks to Elsevier. The definitive version of this document is available at: http://dx.doi.org/10.1016/j.jpowsour.2015.11.099. This author's post-print version is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License.
HAL Id:hal-01457286
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)
Other partners > Materials Research Centre - MRC (UKRAINE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:06 Feb 2017 12:43

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