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The nature and effects of rhodium and antimony dopants on the electronic structure of TiO 2 : towards design of Z-scheme photocatalysts

DOI: 10.1039/C6TA00293E DOI Help

Authors: E Glover (University College London (UCL)) , S. G. Ellington (University College London) , G Sankar (University College London) , R Palgrave (University College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry A

State: Published (Approved)
Published: February 2016
Diamond Proposal Number(s): 10306

Abstract: The nature and effects of rhodium and antimony doping in TiO2 have been investigated using X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Extended X-ray Absorption Fine Structure (EXAFS) analysis, X-ray Absorption Near Edge Structure (XANES) analysis and diffuse reflectance spectroscopy. Together these techniques build up a comprehensive picture of the dopant chemistry in this system. A range of Sb/Rh ratios have been analysed, and it is shown that the Fermi level can be tuned within the band gap through control of dopant stoichiometry, offering the possibility of designing Z-scheme components with specific band offsets. Spontaneous spatial segregation of dopants is measured using TiO2 (110) single crystals. This is shown to have a direct impact on the electronic structure in the region of the semiconductor surface, creating band bending that is expected to be critical for photocatalytic activity of these materials.

Subject Areas: Materials

Instruments: B18-Core EXAFS