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Evaluation of the Electrochemically Active Surface Area of Microelectrodes by Capacitive and Faradaic Currents
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Molecular Biomimetics. Linkoping Univ, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden.
Linkoping Univ, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden;Linkoping Univ, Dept Sci & Technol, Lab Organ Elect, S-60174 Norrkoping, Sweden.ORCID iD: 0000-0001-8478-4663
Linkoping Univ, Dept Sci & Technol, Lab Organ Elect, S-60174 Norrkoping, Sweden.
Linkoping Univ, Dept Sci & Technol, Lab Organ Elect, S-60174 Norrkoping, Sweden.
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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-V C H VERLAG GMBH , 2019. Vol. 6, no 17, p. 4411-4417
Keywords [en]
electrochemically active surface area, microelectrode, capacitive current, faradaic current, numerical modeling
National Category
Physical Chemistry Chemical Process Engineering
Identifiers
URN: urn:nbn:se:uu:diva-395693DOI: 10.1002/celc.201900989ISI: 000485947800008OAI: oai:DiVA.org:uu-395693DiVA, id: diva2:1365246
Available from: 2019-10-24 Created: 2019-10-24 Last updated: 2019-10-24Bibliographically approved

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Sekretaryova, Alina N.

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