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Homogeneous Cobalt/Vanadium Complexes as Precursors for Functionalized Mixed Oxides in Visible‐Light‐Driven Water Oxidation
Author(s) -
Pavliuk Mariia V.,
Mijangos Edgar,
Makhankova Valeriya G.,
Kokozay Vladimir N.,
Pullen Sonja,
Liu Jia,
Zhu Jiefang,
Styring Stenbjörn,
Thapper Anders
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201600769
Subject(s) - catalysis , cobalt , vanadium , inorganic chemistry , water splitting , decomposition , mesoporous material , artificial photosynthesis , chemistry , vanadium oxide , thermal decomposition , electrochemistry , thermal stability , electrocatalyst , metal , materials science , electrode , photocatalysis , organic chemistry
The heterometallic complexes (NH 4 ) 2 [Co(H 2 O) 6 ] 2 [V 10 O 28 ] ⋅ 4 H 2 O ( 1 ) and (NH 4 ) 2 [Co(H 2 O) 5 (β‐HAla)] 2 [V 10 O 28 ] ⋅ 4 H 2 O ( 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 CoV 2 O 6 /V 2 O 5 ( 3 ) and Co 2 V 2 O 7 /V 2 O 5 ( 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 TiO 2 film. The electrodes containing Co/V MMOs in TiO 2 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 TiO 2 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.