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Article Dans Une Revue Electrochemistry Communications Année : 2017

Outstanding room-temperature capacitance of biomass-derived microporous carbons in ionic liquid electrolyte

Résumé

A remarkable capacitance of 180 F·g−1 (at 5 mV·s−1) in solvent-free room-temperature ionic liquid electrolyte, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, was achieved in symmetric supercapacitors using microporous carbons with a specific surface area of ca. 2000 m2·g−1 calculated from gas sorption by the 2D-NLDFT method. The efficient capacitive charge storage was ascribed to textural properties: unlike most activated carbons, high specific surface area was made accessible to the bulky ions of the ionic liquid electrolyte thanks to micropores (1–2 nm) enabled by fine-tuning chemical activation. From the industrial perspective, a high volumetric capacitance of ca. 80 F·cm−3 was reached in neat ionic liquid due to the absence of mesopores. The use of microporous carbons from biomass waste represents an important advantage for large-scale production of high energy density supercapacitors.

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Matériaux Autre
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Dates et versions

hal-01556598 , version 1 (05-07-2017)

Identifiants

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Edurne Redondo, Wan-Yu Tsai, Barbara Daffos, Pierre-Louis Taberna, Patrice Simon, et al.. Outstanding room-temperature capacitance of biomass-derived microporous carbons in ionic liquid electrolyte. Electrochemistry Communications, 2017, 79, pp.5-8. ⟨10.1016/j.elecom.2017.04.004⟩. ⟨hal-01556598⟩
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