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- W2056735229 abstract "• We study anodic oxidation and open circuit decomposition of H 2 O 2 on used nuclear fuel. • The effect of pH (9.5-12.5) on H 2 O 2 redox behaviour on UO 2 is examined. • H 2 O 2 decomposition is blocked at pH = 9.5 by a thin surface layer of U(VI) oxide. • At higher pH values H 2 O 2 decomposition occurs on an unblocked U(IV)/U(V) surface. • At 0.3 V vs. SCE, H 2 O 2 oxidation is the primary reaction, not UO 2 dissolution The anodic oxidation and open circuit decomposition of H 2 O 2 on UO 2+ x surfaces have been investigated voltammetrically and using linear polarization resistance measurements over the pH range 9.5 to 12.6. At the lower pH values both the anodic oxidation and decomposition reactions are almost completely blocked by a thin surface layer of U VI oxide. At higher pH this layer becomes more soluble and anodic oxidation occurs on the sublayer of U IV 1–2 x U V 2 x O 2+ x , but is partially controlled by transport through a permeable, chemically dissolving U VI oxide/hydroxide layer. At positive electrode potentials (0.3 V vs. saturated calomel electrode), approximately 70% of the anodic current is consumed by H 2 O 2 oxidation the remaining 30% going to produce U VI O 2 (OH) x (2− x )+ . At higher pH values, H 2 O 2 decomposition occurs on an unblocked U IV 1–2 x U V 2 x O 2+ x surface and the pH dependence of the reaction suggests HO 2 − is the electroactive form of peroxide" @default.
- W2056735229 created "2016-06-24" @default.
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- W2056735229 date "2014-08-01" @default.
- W2056735229 modified "2023-10-18" @default.
- W2056735229 title "An Electrochemical Study of H2O2 Oxidation and Decomposition on Simulated Nuclear Fuel (SIMFUEL)" @default.
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- W2056735229 doi "https://doi.org/10.1016/j.electacta.2014.06.002" @default.
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