Change search
ReferencesLink to record
Permanent link

Direct link
On the suppression of cathodic hypochlorite reduction by electrolyte additions of molybdate and chromate ions
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
Permascand AB.
Show others and affiliations
2012 (English)In: Journal of Electrochemical Science and Engineering, ISSN 1847-9286, Vol. 2, no 4, 155-169 p.Article in journal (Refereed) Published
Abstract [en]

The goal of this study was to gain a better understanding of the feasibility of replacing Cr(VI) in the chlorate process by Mo(VI), focusing on the cathode reaction selectivity for hydrogen evolution on steel and titanium in a hypochlorite containing electrolyte. To evaluate the ability of Cr(VI) and Mo(VI) additions to hinder hypochlorite reduction, potential sweep experiments on rotating disc electrodes and cathodic current efficiency (CE) measurements on stationary electrodes were performed. Formed electrode films were investigated with scanning electron microscopy and energy-dispersive X-ray spectroscopy. Cathodic hypochlorite reduction is hindered by the Mo-containing films formed on the cathode surface after Mo(VI) addition to the electrolyte, but much less efficient compared to Cr(VI) addition. Very low levels of Cr(VI), in the mM range, can efficiently suppress hypochlorite reduction on polished titanium and steel. Phosphate does not negatively influence the CE in the presence of Cr(VI) or Mo(VI) but the Mo-containing cathode films become thinner if the electrolyte during the film build-up also contains phosphate. For a RuO2-TiO2 anode polarized in electrolyte with 40 mM Mo(VI), the anode potential increased and increased molybdenum levels were detected on the electrode surface.

Place, publisher, year, edition, pages
International Association of Physical Chemists (IAPC) , 2012. Vol. 2, no 4, 155-169 p.
Keyword [en]
electrolysis, chlorate, molybdenum, chromate
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-107575DOI: 10.5599/jese.2012.0021OAI: diva2:576734

QC 20130109

Available from: 2013-01-09 Created: 2012-12-13 Last updated: 2013-01-09Bibliographically approved

Open Access in DiVA

jESE_Vol2_No4_p185-198_2012(3772 kB)32 downloads
File information
File name FULLTEXT01.pdfFile size 3772 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full textPublishers website

Search in DiVA

By author/editor
Gustavsson, JohnLi, GongzhuoCornell, Ann
By organisation
Chemical Engineering and TechnologyApplied Physical Chemistry
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 32 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 27 hits
ReferencesLink to record
Permanent link

Direct link