Improvement of the structural and chemical properties of a commercial activated carbon for its application in electrochemical capacitors

By G. Lota, T. Centeno, E. Frąckowiak, F. Stoeckli. 2008

229 citations recorded by the source corpus.

Abstract The present paper shows that the performance of an inexpensive activated carbon used in electrochemical capacitors can be significantly enhanced by a simple treatment with KOH at 850 °C. The changes in the specific surface area, as well as in the surface chemistry, lead to high capacitance values, which provide a noticeable energy density. The KOH-treatment of a commercial activated carbon leads to highly pure carbons with effective surface areas in the range of 1300–1500 m 2 g −1 and gravimetric capacitances as high as three times that of the raw carbon. For re-activated carbons, one obtains at low current density (50 mA g −1 ) values of 200 F g −1 in aqueous electrolytes (1M H 2 SO 4 and 6M KOH) and around 150 F g −1 in 1M (C 2 H 5 ) 4 NBF 4 in acetonitrile. Furthermore, the resulting carbons present an enhanced and stable performance for high charge/discharge load in organic and aqueous media. This work confirms the possibilities offered by immersion calorimetry on its own for the prediction of the specific capacitance of carbons in (C 2 H 5 ) 4 NBF 4 /acetonitrile. On the other hand, it also shows the limitations of this technique to assess, with a good accuracy, the suitability of a carbon to be used as capacitor electrodes operating in aqueous electrolytes (H 2 SO 4 and KOH).

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/fb141b7377d533b3b39fe47f14c25a6ac566936e

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Citations in the corpus

Reviewing the fundamentals of supercapacitors and the difficulties involving the analysis of the electrochemical findings obtained for porous electrode materials (2020, background): “However, as these authors emphasized it, ‘ curvature effects ’ are indispensable for a quantitative description of the experimental capacitance values, meaning that the microporous carbons studied by Lota et al. [191] have a local pore geometry similar to a cylinder-shaped instead of a slit-shaped.”
Capacitance and surface of carbons in supercapacitors (2017, methodology): “Details on the main structural, textural, chemical and electrochemical characteristics of most of them have been previously reported [18, 26-49].”