Exploring high-performance catalysts has always been a general concern for promoting extended heterocatalysis reactions. Here, Pt embedded highly-porous CeO₂ hollow sphere (Pt/CeO₂ HS) composites are developed by a one-pot template-free solvothermal method. Evolution mechanism studies unravel that the Pt/CeO₂ HS composites are derived from a self-assembly–reduction–Ostwald ripening process, where Pt nanoparticles (Pt NPs) are embedded into ceria mesoporous hollow spheres. The as-developed embedment strategy is more facile, sustainable and cost-effective than conventional deposition approaches, ensuring the precise control of the location, distribution, and uniformity of Pt NPs throughout the outer shell of hollow spherical CeO₂. Importantly, the Pt NP embedding process could be determined to play a key role in creating oxygen vacancies and activating surface chemisorbed oxygen. Besides that, the aggregation of Pt NPs can be efficiently inhibited in the Pt/CeO₂ HS composites, and more active sites should be involved in catalytic reactions. All these advantages contribute to the strikingly improved performance as well as excellent stability of the Pt/CeO₂ HS composites toward CO oxidation reaction compared with mesoporous CeO₂ nanospheres (CeO₂ NS) and Pt/CeO₂ NS reference catalysts. These findings present a decent protocol for desgining noble metal/oxide hollow structural composites in heterogeneous catalysis.

中文翻译：

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嵌入Pt的CeO ₂空心球可增强CO的氧化性能

一直以来，开发高性能催化剂一直是促进扩展的杂催化反应的普遍关注。在这里，通过一锅法无模板溶剂热法开发了嵌入Pt的高孔CeO ₂空心球（Pt / CeO ₂ HS）复合材料。演化机理研究表明，Pt / CeO ₂ HS复合材料来自自组装-还原-奥斯特瓦尔德熟化过程，其中Pt纳米颗粒（Pt NPs）嵌入二氧化铈介孔空心球中。所开发的嵌入策略比传统的沉积方法更加简便，可持续和更具成本效益，从而确保了对空心中空球形CeO ₂整个外壳中Pt NP的位置，分布和均匀性的精确控制。。重要的是，可以确定Pt NP的嵌入过程在产生氧空位和激活表面化学吸附的氧中起关键作用。除此之外，Pt / CeO ₂ HS复合材料中Pt NPs的聚集可以得到有效抑制，并且更多的活性位点应参与催化反应。与介孔CeO ₂纳米球（CeO ₂ NS）和Pt / CeO ₂ NS参比催化剂相比，所有这些优点有助于Pt / CeO ₂ HS复合材料显着改善的性能以及出色的CO氧化反应稳定性。这些发现为在多相催化中设计贵金属/氧化物空心结构复合材料提供了一个不错的方案。