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Title

Direct Synthesis of Highly Porous Interconnected Carbon Nanosheets and Their Application as High-Performance Supercapacitors

AuthorsSevilla Solís, Marta ; Fuertes Arias, Antonio Benito
KeywordsCarbon
Diffusion
Energy storage
Porosity
Supercapacitor
Issue Date14-Apr-2014
PublisherAmerican Chemical Society
CitationACS Nano 8(5): 5069-5078 (2014)
AbstractAn easy, one-step procedure is proposed for the synthesis of highly porous carbon nanosheets with an excellent performance as supercapacitor electrodes. The procedure is based on the carbonization of an organic salt, i.e., potassium citrate, at a temperature in the 750–900 °C range. In this way, carbon particles made up of interconnected carbon nanosheets with a thickness of <80 nm are obtained. The porosity of the carbon nanosheets consists essentially of micropores distributed in two pore systems of 0.7–0.85 nm and 0.95–1.6 nm. Importantly, the micropore sizes of both systems can be enlarged by simply increasing the carbonization temperature. Furthermore, the carbon nanosheets possess BET surface areas in the ∼1400–2200 m2 g–1 range and electronic conductivities in the range of 1.7–7.4 S cm–1 (measured at 7.1 MPa). These materials behave as high-performance supercapacitor electrodes in organic electrolyte and exhibit an excellent power handling ability and a superb robustness over long-term cycling. Excellent results were obtained with the supercapacitor fabricated from the material synthesized at 850 °C in terms of both gravimetric and volumetric energy and power densities. This device was able to deliver ∼13 Wh kg–1 (5.2 Wh L–1) at an extremely high power density of 78 kW kg–1 (31 kW L–1) and ∼30 Wh kg–1 (12 Wh L–1) at a power density of 13 kW kg–1 (5.2 kW L–1) (voltage range of 2.7 V).
Publisher version (URL)http://dx.doi.org/10.1021/nn501124h
URIhttp://hdl.handle.net/10261/140616
DOI10.1021/nn501124h
ISSN1936-0851
E-ISSN1936-086X
Appears in Collections:(INCAR) Artículos
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