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An insight into Faradaic phenomena in activated carbon investigated by means of the microelectrode technique
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Reaction Engineering.
Instituto Nacional del Carbón (CSIC), Oviedo.
Instituto Nacional del Carbón (CSIC), Oviedo.
Instituto Nacional del Carbón (CSIC), Oviedo.
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2007 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 9, no 9, 2320-2324 p.Article in journal (Refereed) Published
Abstract [en]

Cyclic voltammetry was performed on activated carbon particles in a microelectrode setup to investigate the behaviour of an activated carbon with oxygen functionalities. Quinoid type redox peaks were clearly seen in the potential region around -0.5 V vs. Hg/HgO. After polarization below -0.4 V, an anodic peak confirms previous studies using a pristine carbon, but in the present work much higher in intensity. In addition, a corresponding cathodic peak, not previously reported, was also found. The appearance of this pair of peaks in a functionalized carbon may be connected to reversible hydrogen adsorption together with Faradaic reactions involving oxygenated functional groups.

Place, publisher, year, edition, pages
2007. Vol. 9, no 9, 2320-2324 p.
Keyword [en]
activated carbon, microelectrode, oxygen surface groups, quinone/hydroquinone, transport properties, nanoporous carbon, hydrogen storage, supercapacitors
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-16989DOI: 10.1016/j.elecom.2007.06.029ISI: 000249798600031Scopus ID: 2-s2.0-34547953319OAI: oai:DiVA.org:kth-16989DiVA: diva2:335032
Note
QC 20100809Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2010-08-09Bibliographically approved
In thesis
1. Nanoscientific investigations of electrode materials for supercapacitors
Open this publication in new window or tab >>Nanoscientific investigations of electrode materials for supercapacitors
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This doctoral thesis gives background to the field of electrochemical energy storage in supercapacitors. It attempts to place the supercapacitor device in context of available and future technologies for alternative energy systems for transportation. Limitations of cells and electrodes and key challenges in the supercapacitor development are introduced. One objective of the thesis is to investigate and describe ionic transport in active carbon and possible restrictions in nanostructured porous systems with focus on small (micro and meso) pores. Another is to develop a model suitable for investigations of concentration and potential profiles from a single particle perspective. The results from the studies are presented in this thesis together with the scientific papers this thesis is based on.

Studying electrochemical gradients (concentration and potential) of large electrodes and single particles may give important information of the limitations of the material. In larger three-electrode experimental set-ups, these gradients can be studied for electrodes but single particles are not available for experimental studies to the same extent since the matrix of an electrode consist of many particles, all adding to the total gradient of the electrode. The experimental part of this thesis is based on different experimental techniques: Three-electrode experiments for larger electrodes, microelectrode experiments for single particles, numerical simulations using Multiphysics (software) of large electrodes consisting of single particles.

Four Papers are appended to the thesis. They present results and discussions regarding ionic transport, surface functionalities and modeling of a particle based supercapacitor electrode. Estimated effective diffusivities for an active carbon containing micro, meso and macropores are presented. Surface functionalities in the form of oxygen-containing groups were present in a carbon studied using two experimental set-ups. Faradaic peaks, previously not reported in activated carbon were seen. The occurrence of Faradaic phenomena in one experimental set-up but not the other is further analyzed and the origin of these peaks discussed. The particle based mathematical model, where galvanostatic and cyclic voltammetry is simulated, is presented. Concentration profiles both in the particles and electrodes are discussed and some of the numerical results are compared with experimental data.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. iv, 82 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2007:64
Keyword
Supercapacitor, double layer, microelectrode, ionic transport
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-4508 (URN)978-91-7178-767-5 (ISBN)
Public defence
2007-11-08, F3, Lindstedtsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100809Available from: 2007-10-17 Created: 2007-10-17 Last updated: 2010-08-09Bibliographically approved

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