Quantum Origin of the Oxygen Storage Capability of Ceria

The microscopic mechanism behind the extraordinary ability of ceria to store, release, and transport oxygen is explained on the basis of first-principles quantum mechanical simulations. The oxygen-vacancy formation energy in ceria is calculated for different local environments. The reversible $\mathrm{C}\mathrm{e}{\mathrm{O}}_{\mathrm{2}}$-$\mathrm{C}{\mathrm{e}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{3}}$ reduction transition associated with oxygen-vacancy formation and migration is shown to be directly coupled with the quantum process of electron localization.