Surface-dependent oxidation of H2 on CeO2 surfaces

Abstract In this study, ceria nanoparticles with well-defined surface stateswere synthesized in order to enable the study of different ceria surfaces, independently. Ceria nanocubes were shown to expose only (1 0 0) surfaces, ceria nanooctahedra only (1 1 1) surfaces, and ceria nanorods are more complex, with at least 50% of (1 1 0) surfaces, as shown by high-resolution transmission electron microscopy. Temperature-programmed reduction(TPR) by hydrogen performed on these powders shows the following orderof reactiontemperatures: cubes