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In Situ Formation of Efficient Cobalt-Based Water Oxidation Catalysts from Co2+-Containing Tungstate and Molybdate Solutions
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2015 (English)In: Chemistry - An Asian Journal, ISSN 1861-4728, E-ISSN 1861-471X, Vol. 10, no 10, 2228-2233 p.Article in journal (Refereed) PublishedText
Abstract [en]

Replacing rare and expensive noble-metal catalysts with inexpensive and earth-abundant ones is of great importance to split water either electrochemically or photoelectrochemically. In this study, two amorphous cobalt oxide catalysts (Co-W film and Co-Mo film) with high activity for electrocatalytic water oxidation were prepared by fast, simple electrodeposition from aqueous solutions of Na<inf>2</inf>WO<inf>4</inf> and Na<inf>2</inf>MoO<inf>4</inf> containing Co2+. In solutions of Na<inf>2</inf>WO<inf>4</inf> and Na<inf>2</inf>MoO<inf>4</inf>, sustained anodic current densities up to 1.45 and 0.95mA cm-2 were obtained for Co-W film at 1.87V versus a reversible hydrogen electrode (RHE) and Co-Mo film on fluorine-doped tin oxide (FTO) substrates at 1.85V versus RHE. For the Co-W film, a much higher current density of 4.5mA cm-2 was acquired by using a stainless-steel mesh as the electrode substrate. Significantly, in long-term electrolysis for 13h, the Co-W film exhibited improved stability in cobalt-free buffer solution in comparison with the previously reported Co-Pi film.

Place, publisher, year, edition, pages
John Wiley & Sons, 2015. Vol. 10, no 10, 2228-2233 p.
Keyword [en]
cobalt, heterogeneous catalysis, molybdenum, tungsten, water splitting, Amorphous films, Anodic oxidation, Catalysis, Catalysts, Electrodes, Molybdenum oxide, Nanocomposites, Negative ions, Precious metals, Sodium, Stainless steel, Substrates, Tin oxides, Anodic current density, Cobalt oxide catalysts, Fluorine doped tin oxide, Noble metal catalysts, Reversible hydrogen electrodes, Stainless steel mesh, Water oxidation catalysts
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-181144DOI: 10.1002/asia.201500099ISI: 000362824200027ScopusID: 2-s2.0-84942369793OAI: oai:DiVA.org:kth-181144DiVA: diva2:904265
Note

Funding Details: 21476043, NSFC, National Natural Science Foundation of China

QC 20160218

Available from: 2016-02-18 Created: 2016-01-29 Last updated: 2016-02-18Bibliographically approved

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