Homogeneous Cobalt/Vanadium Complexes as Precursors for Functionalized Mixed Oxides in Visible-Light-Driven Water Oxidation.
The heterometallic complexes (NH4)2[Co(H2O)6]2[V10O28]⋅4 H2O (1) and (NH4)2[Co(H2O)5(β-HAla)]2[V10O28]⋅4 H2O (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 TiO2film. The electrodes containing Co/V MMOs in TiO2films were used for electrocatalytic water oxidation and showed good stability and sustained anodic currents of about 5 mA cm-2at 1.72 V versus relative hydrogen electrode (RHE). This method of functionalizing TiO2films 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.
Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 523, S-75120, Uppsala, Sweden. mariia.pavliuk@kemi.uu.se.|Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska St. 64/13, 01601, Kyiv, Ukraine. mariia.pavliuk@kemi.uu.se.
Mariia V
MV
Pavliuk
Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 523, S-75120, Uppsala, Sweden.
Edgar
E
Mijangos
Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska St. 64/13, 01601, Kyiv, Ukraine.
Valeriya G
VG
Makhankova
Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska St. 64/13, 01601, Kyiv, Ukraine.
Vladimir N
VN
Kokozay
Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 523, S-75120, Uppsala, Sweden.
Sonja
S
Pullen
Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 523, S-75120, Uppsala, Sweden.
Jia
J
Liu
Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 523, S-75120, Uppsala, Sweden.
Jiefang
J
Zhu
Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 523, S-75120, Uppsala, Sweden.
Stenbjörn
S
Styring
Department of Chemistry-Ångström Laboratory, Uppsala University, P.O. Box 523, S-75120, Uppsala, Sweden. anders.thapper@kemi.uu.se.
Anders
http://orcid.org/0000-0001-7643-302X
A
Thapper
D003035:Cobalt / Q000737:chemistry*; D008027:Light; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D033362:Powder Diffraction; D013818:Thermogravimetry; D014639:Vanadium / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
D010087:Oxides; D014639:Vanadium; D014867:Water; D003035:Cobalt
cobalt; heterogeneous catalysis; mixed oxides; synthesis design; water oxidation