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In situ formed vanadium-oxide cathode coatings for selective hydrogen production
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
Univ Twente, Fac Sci & Technol, MESA Inst Nanotechnol, PhotoCatalyt Synth Grp, Meander 229,POB 217, NL-7500 AE Enschede, Netherlands..
Nouryon, SE-44580 Bohus, Sweden..
Nouryon, SE-44580 Bohus, Sweden..
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2019 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 244, p. 233-239Article in journal (Refereed) Published
Abstract [en]

Electrode selectivity towards hydrogen production is essential in various conversion technologies for renewable energy, as well as in different industrial processes, such as the electrochemical production of sodium chlorate. In this study we present sodium metavanadate as a solution additive, inducing selective cathodic formation of hydrogen in the presence of various other reducible species such as hypochlorite, chlorate, oxygen, nitrate, hydrogen-peroxide and ferricyanide. During electrolysis a vanadium-oxide coating forms from the reduction of sodium metavanadate, explaining the observed enhanced selectivity. The hydrogen evolution reaction proceeds without significantly altered kinetics on such in situ modified electrode surfaces. This suggests that the reaction takes place at the interface between the electrode surface and the protective film, which acts as a diffusion barrier preventing the unwanted species to reach the electrode surface.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 244, p. 233-239
Keywords [en]
Hydrogen evolution reaction, Cathode selectivity, Overall water splitting, Industrial chemistry, Chlorate electrolysis
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-244478DOI: 10.1016/j.apcatb.2018.11.038ISI: 000457952600024Scopus ID: 2-s2.0-85057088583OAI: oai:DiVA.org:kth-244478DiVA, id: diva2:1298017
Note

QC 20190321

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-04-12Bibliographically approved

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Endrodi, BalazsCornell, Ann M.

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