An investigation of the optical properties and water splitting potential of the coloured metallic perovskites Sr1-xBaxMoO3

H. A. Hopper, J. Le, J. Cheng, T. Weller, R. Marschall, J. Z. Bloh, D. E. Macphee, A. Folli, A. C. McLaughlin

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Abstract

The solid solution Sr1-xBaxMoO3 (x=0.00, 0.025, 0.050, 0.075, 0.100 and 1.00) has been synthesised. Rietveld refinement of X-ray diffraction data shows that all materials crystallise with cubic (Pm-3m) symmetry and that a miscibility gap exists from x=0.1-1.0. The optical properties of the metallic perovskites Sr1-xBaxMoO3 have been investigated by a combination of UV-vis spectroscopy and density functional theory (DFT). Upon increasing x from 0 to 1 in Sr(1-)xBa(x)MoO(3) there is a reduction in the measured band gap from 2.20 eV to 2.07 eV. The measured band gap is attributed to the electronic transition from the Mo 4d t(2g) band to the e(g) band. The potential of SrMoO3 and BaMoO3 as water-splitting photocatalysts was explored but there was no evidence of hydrogen or oxygen evolution, even with the presence of a Pt co-catalyst. (C) 2015 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalJournal of Solid State Chemistry
Volume234
Early online date4 Dec 2015
DOIs
Publication statusPublished - Feb 2016

Keywords

  • Perovskite
  • photocatalysis
  • optical properties
  • space gaussian pseudopotentials
  • photocatalytic performance
  • TiO2 photocatalysis
  • electron-transfer
  • crystal-structure
  • energy-levels
  • aqueous TIO2
  • thin-films
  • X-Ray
  • diffraction

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