Engineering Pt-O coordination microenvironment toward an active, durable, and antipoisoning catalyst in CO oxidation

Platinum stands as a leading catalyst for oxidation reactions, with its catalytic performance intricately governed by the fine-tuning of its local coordination environment. In this study, we present an effective Na⁺-decoration strategy to reconstruct and stabilize the Pt-O coordination microenvironment, achieving remarkable enhancements in catalytic efficiency and durability. The Na⁺-stabilized Pt sites, characterized by a reduced Pt-O coordination number (CN), exhibit exceptional CO activation capabilities, delivering catalytic activity 20 times higher than Na ⁺ -free Pt atoms supported on ceria. Such decoration also promotes electron migration from Ce ³⁺ -oxygen vacancy (O _V ) defects to PtO _x clusters, preserving of a low Pt-O CN even under oxidative conditions, thereby significantly enhancing catalyst stability. Moreover, Na ⁺ -decorated Pt sites effectively suppress hydrocarbon adsorption, mitigating hydrocarbon poisoning during CO oxidation. By leveraging alkali cations to modulate Pt-O coordination, this strategy offers a versatile platform for addressing interface oxygen overstabilization of transition-metal atoms, heralding new opportunities in advancing heterogeneous catalysis for oxidation reactions.