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Evaluation of the Electrochemically Active Surface Area of Microelectrodes by Capacitive and Faradaic Currents
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering. Uppsala Univ, Sweden.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8478-4663
Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: CHEMELECTROCHEM, ISSN 2196-0216, Vol. 6, no 17, p. 4411-4417Article in journal (Refereed) Published
Abstract [en]

Two experimental methods to estimate the electrochemically active surface area (EASA) of microelectrodes are investigated. One method is based on electrocapacitive measurements and depends significantly on the surface roughness as well as on other parameters. The other method is based on faradaic current measurements and depends on the geometric surface area. The experimental results are supplemented with numerical modeling of electrodes with different surface roughness. A systematic study reveals a strong influence of the scale and arrangement of the surface roughness, the measurement potential and the electrolyte concentration on the EASA of microelectrodes estimated from the electrocapacitive measurements. The results show that electrocapacitive measurements should not be used to estimate the faradaic EASA of microelectrodes with a non-negligible surface roughness.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2019. Vol. 6, no 17, p. 4411-4417
Keywords [en]
electrochemically active surface area; microelectrode; capacitive current; faradaic current; numerical modeling
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-161170DOI: 10.1002/celc.201900989ISI: 000485947800008Scopus ID: 2-s2.0-85073038072OAI: oai:DiVA.org:liu-161170DiVA, id: diva2:1365724
Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-10-31Bibliographically approved

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Volkov, Anton

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Sekretareva, AlinaVagin, MikhailVolkov, AntonZozoulenko, IgorEriksson, Mats
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Department of Physics, Chemistry and BiologyFaculty of Science & EngineeringPhysics and ElectronicsLaboratory of Organic ElectronicsSensor and Actuator Systems
Materials Chemistry

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