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Title: Epitaxial ferroelectric BiFeO{sub 3} thin films for unassisted photocatalytic water splitting

Considering energy band alignment and polarization effect, ferroelectric BiFeO{sub 3} thin films are proposed as the photoanode in a monolithic cell to achieve unassisted photocatalytic water splitting. Significant anodic photocurrent was observed in our epitaxial ferroelectric BiFeO{sub 3} films prepared from sputter deposition. Both negative polarization charges and thinner films were found to promote the anodic photocatalytic reaction. Ultraviolet photoelectron spectroscopy proved that the conduction and valence band edges of BiFeO{sub 3} straddle the water redox levels. Theoretical analyses show that the large switchable polarization can modify the surface properties to promote the hydrogen and oxygen evolutions on the surfaces with positive and negative polarization charges, respectively.
Authors:
 [1] ;  [2] ; ; ;  [1] ;  [3]
  1. Institute of Materials Research and Engineering (IMRE), A-STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602 (Singapore)
  2. (Singapore)
  3. Department of Electrical and Computer Engineering, National University of Singapore, Kent Ridge, Singapore 119260 (Singapore)
Publication Date:
OSTI Identifier:
22218213
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 6; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BISMUTH COMPOUNDS; DEPOSITION; EPITAXY; FERROELECTRIC MATERIALS; HYDROGEN; OXIDATION; OXYGEN; PHOTOCATALYSIS; PHOTOCHEMISTRY; PHOTOCONDUCTIVITY; PHOTOELECTRON SPECTROSCOPY; POLARIZATION; SPUTTERING; SURFACE PROPERTIES; THIN FILMS; ULTRAVIOLET RADIATION; WATER