A lamellar ceria structure with encapsulated platinum nanoparticles
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A novel lamellar feather-like CeO2 structure has been fabricated by using a triblock copolymer as the structure-directing agent. This material was characterized in detail by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and BET surface area measurements. Compared with conventional spherical shaped ceria prepared by ammonia gelation, the ceria feathers have superior ability to support nanosized platinum particles due to their special structure. The “skeletons” of ceria feathers can serve as an ideal host matrix to anchor the platinum particles. Furthermore, the inter-crossing pattern of the “skeletons” also acts as a partition to separate platinum particles, allowing the Pt nanoparticles (average diameter ∼6 nm) to be highly dispersed in the structure. The Pt/feather-like CeO2 catalyst exhibits high activity in the water gas shift reaction.