Homogeneous Cobalt/Vanadium Complexes as Precursors for Functionalized Mixed Oxides in Visible-Light-Driven Water Oxidation
2016 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 9, no 20, 2957-2966 p.Article in journal (Refereed) Published
The heterometallic complexes (NH4)2[Co(H2O)6]2[V10O28]·4H2O (1) and (NH4)2[Co(H2O)5(β-HAla)]2[V10O28]·4H2O (2) have been synthesized and used for the preparation of mixed oxides as catalysts for water oxidation. Thermal decomposition of 1 and 2 at relatively low temperatures (<500 °C) leads to the formation of the solid mixed oxides CoV2O6/V2O5 (3) and Co2V2O7/V2O5 (4). The complexes (1, 2) and heterogeneous materials (3, 4) act as catalysts for photoinduced water oxidation. A modification of the thermal decomposition procedure allowed the deposition of mixed metal oxides (MMO) on a mesoporous TiO2 film. The electrodes containing Co/V MMOs in TiO2 films were used for electrocatalytic water oxidation and showed good stability and sustained anodic currents of about 5 mA cm−2 at 1.72 V versus relative hydrogen electrode (RHE). This method of functionalizing TiO2 films with MMOs at relatively low temperatures (<500 °C) can be used to produce other oxides with different functionality for applications in, for example, artificial photosynthesis.
Place, publisher, year, edition, pages
2016. Vol. 9, no 20, 2957-2966 p.
cobalt, heterogeneous catalysis, mixed oxides, synthesis design, water oxidation
Research subject Chemistry with specialization in Molecular Biomimetics
IdentifiersURN: urn:nbn:se:uu:diva-306375DOI: 10.1002/cssc.201600769ISI: 000386953500011OAI: oai:DiVA.org:uu-306375DiVA: diva2:1040462
FunderSwedish Energy Agency, 11674-5Knut and Alice Wallenberg Foundation, 2011.0067Swedish Institute, 00284/2013