Abstract
A combination of electrochemical methods and X-ray photoelectron spectroscopy has been used to study the combined influence of and dissolved on the oxidation of SIMFUEL ( electrodes fabricated to simulate spent nuclear fuel without the accompanying radiation fields) electrodes in 0.1 mol/L KCl (pH 9.5) at . The SIMFUEL electrodes contain (where RE is rare earth) ions at lattice sites within the matrix and noble metal particles dispersed throughout the solid. Under Ar-purged conditions, can be oxidized by by coupling to its direct reduction on the surface and on the noble metal particles that are galvanically coupled to the matrix. The radicals formed on the noble metal particles can be scavenged by reaction with in -purged solutions. Because the concentration is many orders of magnitude greater than concentrations, the rate of formation of radicals on the noble metal surface exceeds that of radicals, leading to the prevention, or even the reversal, of oxidation. A ratio is sufficient to completely protect the surface from oxidation.
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