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A New Family of Photoactive Catalysts Based Upon Bismuth Oxide

Published online by Cambridge University Press:  28 February 2011

Anthony Harriman ,
John M. Thomas ,
Wuzong Zhou  and
David A. Jefferson
Anthony Harriman
Affiliation:
Davy Faraday Research Laboratory, The Royal Institution, 21 Albemarle Street, London WIX 4BS, England
John M. Thomas
Affiliation:
Davy Faraday Research Laboratory, The Royal Institution, 21 Albemarle Street, London WIX 4BS, England
Wuzong Zhou
Affiliation:
Davy Faraday Research Laboratory, The Royal Institution, 21 Albemarle Street, London WIX 4BS, England
David A. Jefferson
Affiliation:
Department of Physical Chemistry, University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 lEP, England
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Abstract

Bismuth(III) oxide, which is pale yellow, functions as an amphoteric semiconductor, although it is relatively unstable upon illumination with UV light. The energy level positioning, corrosion limits and photoactivity of samples of n-type bismuth oxide have been determined by electrochemical techniques. It was found that this material is able to oxidise water to molecular oxygen upon illumination with UV light.

Bismuth oxide forms a wide range of well-defined solid solutions with many other oxides and, in particular, niobium oxide can be used to form several distinct structures, each based upon defective fluorite. Each of these structures will function as an n-type semiconductor, retaining the basic properties of undoped bismuth oxide. However, the exact composition of the solid solution determines the band-gap energy of the semiconductor. Low concentrations of niobium in the lattice induce a substantial lowering in the band-gap energy and give rise to orange coloured materials that can collect a higher fraction of the solar spectrum. Photoelectrochemical studies showed that the presence of niobium caused the valence band to move to lower potentials but had little effect upon the energy of the conduction band. The photochemical properties of these solid solutions were studied using the photooxidation of alcohols as a test system. The results are discussed in terms of the structure of the oxide.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 111: Symposium O – Microstructure and Properties of Catalysts , 1987 , 295
Copyright
Copyright © Materials Research Society 1988

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References

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