Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO₂ to Enhance Photo‐Thermocatalytic CO Oxidation

Abstract Effective catalytic oxidation of toxic emissions at low temperatures has great significance on environmental protection. Herein, a novel structure of Pt/CeO₂ catalyst, composed of abundant CeO₂ clusters captured by nanoporous Pt particles, is designed to enhance the photo‐thermocatalytic CO oxidation by boosting the amount of active sites. The nanosized CeO₂ support is fabricated by vacuum thermal decomposition and then the Pt/CeO₂ catalyst with a nanoporous structure is synthesized by a one‐pot solution reduction method in a mild condition. The synthesized catalyst exhibits great low‐temperature CO catalytic oxidation activity, and the temperature for 90% CO conversion is 154 °C, achieving comparable catalytic activity with the single‐atom Pt/CeO₂ catalyst. Abundant dual active sites, in terms of active oxygen absorbed on the oxygen vacancies and spillover from ceria to Pt, and active Pt sites located near the perimeter of the Pt–CeO₂ interface, are formed to improve the photo‐thermocatalytic activity for CO oxidation.