Structural transformation of Bi1-x/3V1-xMoxO4 solid solutions for light-driven water oxidationt
2016 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 45, no 9, 3895-3904 p.Article in journal (Refereed) PublishedText
The influence of molybdenum content in the solid solutions of Bi1-x/V-3(1-x),MoxO4 (x = 0.05-0.20) on the morphology, band gap, structure and light -driven water oxidation properties has been studied by scanning electron microscopy, X-ray powder diffraction and vibrational spectroscopy (Raman and infrared). To find out the peculiarities of structural changes for bismuth scheelite-related oxides containing both vanadium and molybdenum crystals of Bi0.98V0.93M0.07O4 have been grown from a K-Bi V-Mo-high-temperature melt and characterized by single crystal X-ray diffraction. For the scheelite-related framework both V and Mo were found to occupy the same positions lowering the point group symmetry of tetrahedra from 4/m to 2/m giving monoclinic distortion for solid solutions with x = 0.05----0.10. The most promising photocatalytic performance was obtained for Bi0.96Mo0.1V0.5004, in which the oxygen evolution could reach 21 mu M in 50 s under visible light of LEDs, lambda = 470 +/- 10 nm, and 820.E cm(-2) s(-1). The changes in catalytic properties are shown to be governed by a crystal structure strain with a maximum obtained for the boundary sample between the monoclinic and tetragonal phase.
Place, publisher, year, edition, pages
2016. Vol. 45, no 9, 3895-3904 p.
IdentifiersURN: urn:nbn:se:uu:diva-283808DOI: 10.1039/c5dt04829jISI: 000371140900031PubMedID: 26908189OAI: oai:DiVA.org:uu-283808DiVA: diva2:921347