Abstract
The oxidation process of cerium in air (by oxygen and water vapor) is elucidated by combining structural and compositional analyses of the oxide with time. The oxide contains a high content of hydrogen, present mainly as hydroxyls in the upper part and hydride ions at the interface with the metal. The high content of hydroxyls on the oxide's surface leads to the formation of a thin hydroxide layer (Ce(OH)3) and to an increased oxidation rate. The observed anisotropy in oxidation rate (111) < (220) < (200) is consistent with the efficiency for H2O splitting and to the preferred paths for OH- diffusion.
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