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Aqueous Activated Graphene Dispersions for Deposition of High Surface Area Supercapacitor Electrodes
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-8438-2581
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-3320-8487
2020 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185Article in journal (Refereed) Accepted
Abstract [en]

High surface area activated graphene has 3D porous structure which makes it difficult for preparation of dispersions. Here we report a general approach allowing to prepare stable water-based dispersions/inks with concentration up to ~20 mg/ml based on activated graphene using environmentally friendly formulations. Simple drying of the dispersion on substrate allows to prepare electrodes which maintain high specific surface area of the precursor material (~1700 m2/g). The electrodes are flexible thanks to the structure consisting of micrometer sized activated graphene grains interconnected by carbon nanotubes. The electrodes prepared using activated graphene demonstrate performance superior to rGO in supercapacitors with KOH and TEA BF4/acetonitrile electrolytes providing specific capacitance values of 180F/g and 137 F/g at 1A/g specific current respectively. High surface area of activated graphene in combination with good conductivity of CNT allow achieving energy density of 35.6 Wh/kg and power density of 42.2 kW/kg. The activated graphene dispersions were prepared in liter amounts and are compatible with most of the industrial deposition methods.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2020.
National Category
Physical Chemistry
Research subject
Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-169134DOI: 10.1021/acs.jpclett.0c00272OAI: oai:DiVA.org:umu-169134DiVA, id: diva2:1416129
Available from: 2020-03-21 Created: 2020-03-21 Last updated: 2020-03-25

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Skrypnychuk, VasylBoulanger, NicolasNordenström, AndreasTalyzin, Alexandr V.

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