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Activated Cathodes for the Hydrogen Evolution Reaction in Chlorate Manufacture
KTH, Superseded Departments, Chemical Engineering and Technology. (Tillämpad elektrokemi)ORCID iD: 0000-0001-5816-2924
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 [en]
chlorate, cathode, ruthenium dioxide, chromate
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-107586OAI: oai:DiVA.org:kth-107586DiVA: diva2:576782
Supervisors
Note

QC 20130208

Available from: 2013-02-08 Created: 2012-12-13 Last updated: 2013-02-08Bibliographically approved
List of papers
1. The effect of addition of chromate on the hydrogen evolution reaction and on iron oxidation in hydroxide and chlorate solutions
Open this publication in new window or tab >>The effect of addition of chromate on the hydrogen evolution reaction and on iron oxidation in hydroxide and chlorate solutions
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.

Keyword
chlorate manufacture, chromate, chromium hydroxide, hydrogen evolution reaction, iron oxidation
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-13052 (URN)10.1016/0013-4686(92)85093-Z (DOI)
Note

QC 20100525

Available from: 2010-05-25 Created: 2010-05-25 Last updated: 2017-12-12Bibliographically approved
2. Ruthenium Dioxide as Cathode Material for Hydrogen Evolution in Hydroxide and Chlorate Solutions
Open this publication in new window or tab >>Ruthenium Dioxide as Cathode Material for Hydrogen Evolution in Hydroxide and Chlorate Solutions
1993 (English)In: Journal of The Electrochemical Society, Vol. 140, no 11, 3123-3129 p.Article in journal (Refereed) Published
Abstract [en]

Ruthenium dioxide as electrocatalyst on an activated cathode for chlorate production was investigated with respect toits activity towards hydrogen evolution, hypochlorite reduction, and chlorate reduction, respectively. Investigations weremade in the presence, as well as in the absence, of a chromium hydroxide film in 1M NaOH and in typical chlorateelectrolyte. Low overvoltages for hydrogen evolution were found and, at technical current densities, an effect of catalystcoating thickness. Commercial DSA® electrodes with RuO2 as the active compound were tested as cathodes and were lessactive but more stable than the coatings produced by us. Hypochlorite and chlorate were reduced in the absence ofchromate, chlorate reduction being fast on ruthenium dioxide compared to the other electrode materials and by far thedominating cathodic reaction in chlorate electrolyte without chromate and hypochlorite at 70°C, 3 kA/m2

Keyword
catalysts; catalysis; ruthenium compounds; oxygen compounds; electrochemistry; electrochemical electrodes; reduction (chemical); reaction kinetics
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-13053 (URN)10.1149/1.2220996 (DOI)
Note
QC 20100525Available from: 2010-05-25 Created: 2010-05-25 Last updated: 2013-02-08Bibliographically approved

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