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Metal-free supercapacitor with aqueous electrolyte and low-cost carbon materials
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. STT Emtec AB, Sundsvall. (Teknisk Fysik)ORCID iD: 0000-0002-4303-2585
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, 39836Article in journal (Refereed) Published
Abstract [en]

Electric double-layer capacitors (EDLCs) or supercapacitors (SCs) are fast energy storage devices with high pulse efficiency and superior cyclability, which makes them useful in various applications including electronics, vehicles and grids. Aqueous SCs are considered to be more environmentally friendly than those based on organic electrolytes. Because of the corrosive nature of the aqueous environment, however, expensive electrochemically stable materials are needed for the current collectors and electrodes in aqueous SCs. This results in high costs for a given energy-storage capacity. To address this, we developed a novel low-cost aqueous SC using graphite foil as the current collector and a mix of graphene, nanographite, simple water-purification carbons and nanocellulose as electrodes. The electrodes were coated directly onto the graphite foil by using casting frames and the SCs were assembled in a pouch cell design. With this approach, we achieved a material cost reduction of greater than 90% while maintaining approximately one-half of the specific capacitance of a commercial unit, thus demonstrating that the proposed SC can be an environmentally friendly, low-cost alternative to conventional SCs.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017. Vol. 7, 39836
Keyword [en]
Supercapacitor, EDLC, Graphene, Graphite, Nanoparticles
National Category
Composite Science and Engineering Condensed Matter Physics
Identifiers
URN: urn:nbn:se:miun:diva-29827DOI: 10.1038/srep39836ISI: 000391182900001Scopus ID: 2-s2.0-85008701942OAI: oai:DiVA.org:miun-29827DiVA: diva2:1062532
Funder
Swedish Energy Agency
Note

Published online:05 January 2017

Available from: 2017-01-06 Created: 2017-01-06 Last updated: 2017-02-10Bibliographically approved

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Blomquist, NicklasWells, ThomasAndres, BrittaBäckström, JoakimForsberg, SvenOlin, Håkan
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