Facet-Dependent Diversity of Pt-O Coordination for Pt₁/CeO₂ Catalysts Achieved by Oriented Atomic Deposition

The surface chemistry of CeO₂ is dictated by the well-defined facets, which exert great influence on the supported metal species and the catalytic performance. Here we report Pt₁/CeO₂ catalysts exhibiting specific structures of Pt-O coordination on different facets by using adequate preparation methods. The simple impregnation method results in Pt-O₃ coordination on the predominantly exposed {111} facets, while the photo-deposition method achieves oriented atomic deposition for Pt-O₄ coordination into the "nano-pocket" structure of {100} facets at the top. Compared to the impregnated Pt₁/CeO₂ catalyst showing normal redox properties and low-temperature activity for CO oxidation, the photo-deposited Pt₁/CeO₂ exhibits uncustomary strong metal-support interaction and extraordinary high-temperature stability. The preparation methods dictate the facet-dependent diversity of Pt-O coordination, resulting in the further activity-selectivity trade-off. By applying specific preparation routes, our work provides an example of disentangling the effects of support facets and coordination environments for nano-catalysts.