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Electrolysis-reducing electrodes for electrokinetic devices
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. (Transport and Separations Group)
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology. (Transport and Separations Group)ORCID iD: 0000-0002-2773-5096
2011 (English)In: ELECTROPHORESIS, ISSN 0173-0835, Vol. 32, no 6-7, 784-790 p.Article in journal (Refereed) Published
Abstract [en]

Direct current electrokinetic systems generally require Faradaic reactions to occur at a pair of electrodes to maintain an electric field in an electrolyte connecting them. The vast majority of such systems, e. g. electrophoretic separations (capillary electrophoresis) or electroosmotic pumps (EOPs), employ electrolysis of the solvent in these reactions. In many cases, the electrolytic products, such as H+ and OH- in the case of water, can negatively influence the chemical or biological species being transported or separated, and gaseous products such as O-2 and H-2 can break the electrochemical circuit in microfluidic devices. This article presents an EOP that employs the oxidation/reduction of the conjugated polymer poly(3,4-ethylenedioxythiophene), rather than electrolysis of a solvent, to drive flow in a capillary. Devices made with poly(3,4-ethylenedioxythiophene) electrodes are compared with devices made with Pt electrodes in terms of flow and local pH change at the electrodes. Furthermore, we demonstrate that flow is driven for applied potentials under 2 V, and the electrodes are stable for potentials of at least 100 V. Electrochemically active electrodes like those presented here minimize the disadvantage of integrated EOP in, e. g. lab-on-a-chip applications, and may open new possibilities, especially for battery-powered disposable point-of-care devices.

Place, publisher, year, edition, pages
John Wiley and Sons, Ltd , 2011. Vol. 32, no 6-7, 784-790 p.
Keyword [en]
Conducting polymers, Electrochemical electrodes, Electroosmosis, Gas evolution, Microfluidics
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-67312DOI: 10.1002/elps.201000617ISI: 000288602000019OAI: diva2:409387
Available from: 2012-06-08 Created: 2011-04-08 Last updated: 2013-10-07Bibliographically approved

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