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Supercapacitors with graphene coated paper electrodes
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.ORCID iD: 0000-0003-2873-7875
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2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 2, 481-485 p.Article in journal (Refereed) Published
Abstract [en]

Paper based supercapacitors are prepared by stacking a paper between two graphene electrodes and soaking these in an aqueous electrolyte. We demonstrate that supercapacitors can easily be manufactured by using proven paper technologies. Several different electrode materials were compared and two types of contacting material, silver and graphite foil were tested. The influence of the paper used as separator was also investigated. The supercapacitors with a graphene-gold nanoparticle composite as electrodes showed a specific capacitance of up to 100 F/g and an energy density of 1.27 Wh/kg. The energy density can further be increased by using other electrolytes. The silver contacts showed a pseudo capacitance, which the graphite contacts did not. The papers tested had a minor effect on the capacitance, but they have an influence on the weight and the volume of the supercapacitor.

Place, publisher, year, edition, pages
2012. Vol. 27, no 2, 481-485 p.
Keyword [en]
Coating; Graphene; Graphite; Paper; Supercapacitor
National Category
Engineering and Technology
URN: urn:nbn:se:miun:diva-16880DOI: 10.3183/NPPRJ-2012-27-02-p481-485ISI: 000315696000044ScopusID: 2-s2.0-84865260056Local ID: STCOAI: diva2:548005
Available from: 2013-04-04 Created: 2012-08-29 Last updated: 2016-10-20Bibliographically approved
In thesis
1. Paper-based Supercapacitors
Open this publication in new window or tab >>Paper-based Supercapacitors
2014 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The growing market of mobile electronic devices, renewable off-grid energy sources and electric vehicles requires high-performance energy storage devices. Rechargeable batteries are usually the first choice due to their high energy density. However, supercapacitors have a higher power density and longer life-time compared to batteries. For some applications supercapacitors are more suitable than batteries. They can also be used to complement batteries in order to extend a battery's life-time. The use of supercapacitors is, however, still limited due to their high costs. Most commercially available supercapacitors contain expensive electrolytes and costly electrode materials.

In this thesis I will present the concept of cost efficient, paper-based supercapacitors. The idea is to produce supercapacitors with low-cost, green materials and inexpensive production processes. We show that supercapacitor electrodes can be produced by coating graphite on paper. Roll-to-roll techniques known from the paper industry can be employed to facilitate an economic large-scale production. We investigated the influence of paper on the supercapacitor's performance and discussed its role as passive component. Furthermore, we used chemically reduced graphite oxide (CRGO) and a CRGO-gold nanoparticle composite to produce electrodes for supercapacitors. The highest specific capacitance was achieved with the CRGO-gold nanoparticle electrodes. However, materials produced by chemical synthesis and intercalation of nanoparticles are too costly for a large-scale production of inexpensive supercapacitor electrodes. Therefore, we introduced the idea of producing graphene and similar nano-sized materials in a high-pressure homogenizer. Layered materials like graphite can be exfoliated when subjected to high shear forces. In order to form mechanical stable electrodes, binders need to be added. Nanofibrillated cellulose (NFC) can be used as binder to improve the mechanical stability of the porous electrodes. Furthermore, NFC can be prepared in a high-pressure homogenizer and we aim to produce both NFC and graphene simultaneously to obtain a NFC-graphene composite. The addition of 10% NFC in ratio to the amount of graphite, increased the supercapacitor's capacitance, enhanced the dispersion stability of homogenized graphite and improved the mechanical stability of graphite electrodes in both dry and wet conditions. Scanning electron microscope images of the electrode's cross section revealed that NFC changed the internal structure of graphite electrodes depending on the type of graphite used. Thus, we discussed the influence of NFC and the electrode structure on the capacitance of supercapacitors.

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2014. 65 p.
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 112
graphene, graphite, paper, nano fibrillated cellulose, supercapacitor, electric double-layer capacitor, energy storage, roll-to-roll, coating, kinetic energy recovery
National Category
Physical Sciences
urn:nbn:se:miun:diva-22410 (URN)978-91-87557-68-2 (ISBN)
2014-06-12, O 102, Mid Sweden University, Holmgatan 10, Sundsvall, 10:15 (English)
Available from: 2014-08-18 Created: 2014-07-03 Last updated: 2015-03-13Bibliographically approved

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Andres, BrittaForsberg, SvenVilches, Ana PaolaZhang, RenyunAndersson, HenrikHummelgård, MagnusBäckström, JoakimOlin, Håkan
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