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Ruthenium based DSA in chlorate electrolysis–critical anode potential and reaction kinetics
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-5816-2924
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-9203-9313
2003 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 48, no 5, 473-481 p.Article in journal (Refereed) Published
Abstract [en]

Ruthenium based DSA®s have been investigated in chlorate electrolyte using rotating discs made from commercial electrodes. Measurements of the voltammetric charge, q*, and of iR-corrected polarisation curves up to current densities of 40 kA/m2 were recorded on new anodes and on aged anodes from 3 years of production in a chlorate plant. Anodic polarisation curves in chloride containing electrolytes bend towards a higher slope at approximately 1.2 V versus Ag/AgCl, likely due to oxidation of ruthenium. The potential and current density at which the curves bend have been defined as the critical potential, Ecr, and the critical current density, icr. New anodes that operate at a relatively high potential, >Ecr, obtain an increase in real surface area and thereby a decrease in anode potential and in the selectivity for oxygen formation during the first months of operation. Experiments at constant ionic strength under chlorate process conditions showed that Ecr decreased with increasing chloride concentration with a factor of −0.09 V/log Cl, whereas icr increased with increasing chloride concentration. The chlorine evolution reaction was of the first order with respect to chloride concentration. A possible reaction mechanism for chlorine formation is suggested.

Place, publisher, year, edition, pages
2003. Vol. 48, no 5, 473-481 p.
Keyword [en]
Chlorate electrolysis, DSA, RuO2, Critical potential, Reaction kinetics
Identifiers
URN: urn:nbn:se:kth:diva-13051DOI: 10.1016/S0013-4686(02)00679-5ISI: 000180654800003Scopus ID: 2-s2.0-0037438760OAI: oai:DiVA.org:kth-13051DiVA: diva2:320381
Note

QC 20100525

Available from: 2010-05-25 Created: 2010-05-25 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Electrode reactions in the chlorate process
Open this publication in new window or tab >>Electrode reactions in the chlorate process
2002 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2002. 47 p.
Series
Trita-KET, ISSN 1104-3466 ; 163
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-3442 (URN)
Public defence
2002-12-06, 00:00 (English)
Note
QC 20100525Available from: 2002-12-03 Created: 2002-12-03 Last updated: 2010-05-25Bibliographically approved

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Cornell, AnnLindbergh, Göran

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