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Effect of the Ionic Conductivity on the Performance of Polyelectrolyte-Based Supercapacitors
School of Materials Science and Engineering Nanyang Technological University Singapore.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
School of Materials Science and Engineering Nanyang Technological University Singapore.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-4791-4785
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2010 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 20, no 24, 4344-4350 p.Article in journal (Refereed) Published
Abstract [en]

In the emerging technology field of printed electronics, circuits are envisioned to be powered with printed energy sources, such as printed batteries and printed supercapacitors (SCs). For manufacturing and reliability issues, solid electrolytes are preferred instead of liquid electrolytes. Here, a solid-state, polyanionic proton conducting electrolyte, poly(styrenesulfonic acid) (PSS:H), is demonstrated for the first time as an effective ion conducting electrolyte medium in SCs with electrodes based on carbon nanotube (CNT) networks. The effect of the ionic conductivity in the PSS:H film of those SCs is studied at different levels of relative humidity (RH) with impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge techniques. High capacitance values (85 F g(-1) at 80% RH) are obtained for these SCs due to the extremely high effective electrode area of the CNTs and the enhanced ionic conductivity of the PSS: H film at increasing RH level. The charging dynamics are primarily limited by the ionic conductivity of the electrolyte rather than a poor contact between the electrolyte and the CNT electrodes. The use of polyelectrolytes in SCs provides high mechanical strength and flexibility, while maintaining a high capacitance value, enabling a new generation of printable solid-state charge storage devices.

Place, publisher, year, edition, pages
John Wiley and Sons, Ltd , 2010. Vol. 20, no 24, 4344-4350 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-64584DOI: 10.1002/adfm.201001096ISI: 000285393600016OAI: diva2:392792
Available from: 2011-01-28 Created: 2011-01-28 Last updated: 2015-05-06Bibliographically approved
In thesis
1. Polyelectrolyte-Based Capacitors and Transistors
Open this publication in new window or tab >>Polyelectrolyte-Based Capacitors and Transistors
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Polymers are very attractive materials that can be tailored for specific needs and functionalities. Based on their chemical structure, they can for instance be made electrically insulating or semiconducting with specific mechanical properties. Polymers are often processable from a solution, which enables the use of conventional low-cost and high-volume manufacturing techniques to print electronic devices onto flexible substrates. A multitude of polymer-based electronic and electrochemical devices and sensors have been developed, of which some already has reached the consumer market.

This thesis focuses on polarization characteristics in polyelectrolyte-based capacitor structures and their role in sensors, transistors and supercapacitors. The fate of the ions in these capacitor structures, within the polyelectrolyte and at the interfaces between the polyelectrolyte and various electronic conductors (a metal, a semiconducting polymer or a network of carbon nanotubes), is of outermost importance for the device function. The humidity-dependent polarization characteristics in a polyelectrolyte capacitor are used as the sensing probe for wireless readout of a passively operated humidity sensor circuit. This sensor circuit can be integrated into a printable low-cost passive sensor label. By varying the humidity level, limitations and possibilities are identified for polyelectrolyte-gated organic field-effect transistors. Further, the effect of the ionic conductivity is investigated for polyelectrolyte-based supercapacitors. Finally, by using an ordinary electrolyte instead of a polyelectrolyte and a high-surface area (supercapacitor) gate electrode, the device mechanisms proposed for electrolyte-gated organic transistors are unified.

Place, publisher, year, edition, pages
Norrköping: Linköping University Electronic Press, 2011. 56 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1370
Organic electronics, Polarization, Polyelectrolyte, Transistor, Polymer, Sensor, Capacitor
National Category
Natural Sciences
urn:nbn:se:liu:diva-67852 (URN)978-91-7393-160-1 (ISBN)
Public defence
2011-06-13, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Available from: 2011-05-02 Created: 2011-04-29 Last updated: 2013-09-12Bibliographically approved

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Larsson, OscarBerggren, MagnusCrispin, Xavier
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