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The effect of addition of chromate on the hydrogen evolution reaction and on iron oxidation in hydroxide and chlorate solutions
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-5816-2924
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-9203-9313
KTH, Superseded Departments, Chemical Engineering and Technology.
1992 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 37, no 10, 1873-1881 p.Article in journal (Refereed) Published
Abstract [en]

The addition of chromate to the electrolyte has been shown in previous papers to hinder almost completely the electroreduction of hypochlorite, while the hydrogen evolution reaction can still proceed on the cathode surface. The effect of chromate on the latter reaction has been studied with cyclic voltammetry and by measuring polarization curves for iron electrodes in both chlorate and hydroxide electrolyte. For the sake of comparison, the investigations have also included the effects on the gold electrode in hydroxide solution. The results showed that the kinetics is changed in a way that decreases the differences in electrocatalytic activity between different electrode materials. Also, the innermost layer of the chromium hydroxide film seems to be the most active part in the HER. The chromate also affects the oxidation of the iron surface. A practical result of this is that the activity for the HER on corroded iron in chlorate electrolyte depends on whether the electrolyte contained chromate during the period of corrosion. The activation becomes much smaller if chromate is present.

Place, publisher, year, edition, pages
1992. Vol. 37, no 10, 1873-1881 p.
Keyword [en]
chlorate manufacture, chromate, chromium hydroxide, hydrogen evolution reaction, iron oxidation
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-13052DOI: 10.1016/0013-4686(92)85093-ZOAI: oai:DiVA.org:kth-13052DiVA: diva2:320382
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
2. Activated Cathodes for the Hydrogen Evolution Reaction in Chlorate Manufacture
Open this publication in new window or tab >>Activated Cathodes for the Hydrogen Evolution Reaction in Chlorate Manufacture
1993 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 1993. 33 p.
Series
TRITA-TEK, ISSN 0281-4110 ; 1993:01
Keyword
chlorate, cathode, ruthenium dioxide, chromate
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-107586 (URN)
Supervisors
Note

QC 20130208

Available from: 2013-02-08 Created: 2012-12-13 Last updated: 2013-02-08Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/B6TG0-44CH180-6C/2/21942278121d0983edcf918dc9901ea9

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Cornell, AnnLindbergh, Göran

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