Noble metal/transition metal oxide interfaces are typically considered as highly active sites for most heterogeneous catalytic reactions and can effectively increase the utilization of noble metals. One of the challenges in such catalytic systems, particularly under high‐temperature reactions, is the lack of an effective strategy to stabilize the catalysts against sintering over time and maintain the metal/oxide interfaces. We developed a one‐pot facile strategy to embed the ultrafine Pt−Ni(O) nanoparticles (NPs) with dual interfaces (Pt−Ni−NiO) in a microporous silica shell to fabricate a high‐performance heterogeneous oxidation catalyst (assigned as Pt−Ni(O)@SiO₂) for the first time. Owing to the ultra‐small size of the Pt−Ni(O) NPs and the confinement effect of the silica shell, the resulting Pt−Ni(O)@SiO₂ catalyst exhibited enhanced performance for CO oxidation and toluene [one of the main volatile organic compounds, (VOCs)] total combustion. The effects of Pt−NiO, Pt−Ni−NiO, and Pt−Ni interfaces were also studied in detail. The results indicated that the Pt−NiO and Pt−Ni alloy dual interface have the improving effect for catalytic oxidation and reducing utilization of noble metals. The strategy developed in this work may represent a general approach in the rational design of other high‐performance catalysts combining the interface catalysis and physical confinement concept to improve the usage of the noble metals.

中文翻译：

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具有增强的催化性能的稳定的超小Pt-Ni（O）纳米颗粒的设计：对Pt-Ni-NiO双界面作用的见解

贵金属/过渡金属氧化物界面通常被认为是大多数非均相催化反应的高活性位点，可以有效地提高贵金属的利用率。在这样的催化体系中，特别是在高温反应下，挑战之一是缺乏有效的策略来稳定催化剂以防止随着时间的推移烧结并保持金属/氧化物界面。我们开发了一种简单的策略，将具有双界面（Pt-Ni-NiO）的超细Pt-Ni（O）纳米颗粒（NPs）嵌入微孔二氧化硅壳中，以制造高性能的多相氧化催化剂（指定为Pt -Ni（O）@SiO ₂）。由于Pt-Ni（O）NPs的超小尺寸和二氧化硅壳的约束作用，因此生成的Pt-Ni（O）@SiO_2种催化剂对CO氧化和甲苯[一种主要的挥发性有机化合物（VOC）]的总燃烧表现出增强的性能。还详细研究了Pt-NiO，Pt-Ni-NiO和Pt-Ni界面的影响。结果表明，Pt-NiO和Pt-Ni合金双界面对催化氧化和降低贵金属利用率具有改善作用。这项工作中开发的策略可能是合理设计其他高性能催化剂的一般方法，该方法结合了界面催化和物理限制概念来改善贵金属的使用。