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Surface Electrochemistry of Uranium Dioxide in Acidic Hydrogen Peroxide Solutions

Published online by Cambridge University Press:  27 March 2012

Mayuri Razdan ,
David Hall  and
David W. Shoesmith
Mayuri Razdan
Affiliation:
Department of Chemistry, University of Western Ontario, London, ON N6A 5B7, Canada
David Hall
Affiliation:
Department of Chemistry, University of Ottawa, Ottawa, ON K1N 6N5, Canada
David W. Shoesmith
Affiliation:
Department of Chemistry, University of Western Ontario, London, ON N6A 5B7, Canada
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Abstract

The electrochemical reduction of H2O2 on SIMFUEL was investigated over the pH range 1 to 4. The mechanism at pH 4 is known to occur on UV species incorporated into a surface layer of UIV1-2xUV2xO2+x. However, below pH 3, reduction occurs on an adsorbed UVO2(OH) state which is unstable and oxidizes to insulating UVI before dissolving as UO22+. Both schemes are observed at intermediate pH’s. The presence of both low and high acidic regions at the electrode surface is determined by the combination of peroxide concentration, bulk pH and the surface diffusion conditions.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1475: Symposium NW – Scientific Basis for Nuclear Waste Management XXXV , 2012 , imrc11-1475-nw35-p18
Copyright
Copyright © Materials Research Society 2012

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References

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