Abstract
The anodic oxidation of UO2 has been studied in aqueous phosphate solutions over the pH range 4 to 11, using a combination of electrochemical and X-ray photoelectron spectroscopic techniques. The early stages of oxidation, leading to the formation of a film of composition UO2.33, are unaffected by the presence of phosphate in the solutions. Phosphate concentrations [Formula: see text]prevent the formation of higher-oxide films that are present in phosphate-free solutions at higher oxidation potentials. Dissolution under steady-state conditions proceeds via a surface film of uranyl phosphate. For potentials [Formula: see text] (vs. SCE), the rate of dissolution to yield[Formula: see text] is controlled by charge-transfer kinetics. For potentials[Formula: see text], the rate-determining step is the chemical dissolution of the uranyl phosphate layer.
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