Planar metal clusters possess high metal utilization, distinct electronic properties, and catalytic functions from their 3D counterparts. However, synthesis of these materials is challenging due to much elevated surface free energies. Here it is reported that silica supported planar bilayer Pt‐CoO_x subnano clusters, consisting of approximately one atomic layer of Pt and one CoO_x layer on top, can be achieved by employing strong‐electrostatic interactions during impregnation and precisely‐controlled CoO_x coating using atomic layer deposition. Such bilayer structure is unambiguously confirmed by electron microscopy and in situ X‐ray absorption fine spectroscopy which is never reported before. This synthetic approach can be extended to another eight permutations of planar metal‐oxide subnano clusters. The resulting bilayer catalysts, owing to unique electronic properties and the abundant metal‐oxide interfaces created, exhibit excellent catalytic performances in the reactions of preferential oxidation of CO in H₂ and selective hydrogenation of acetylene, by showing much higher selectivity and intrinsic activities at least 8 and 48 times greater than those conventional oxide coated 3D metal clusters/nanoparticles, highlighting the advances of bilayer interfacial structure. These findings open a new avenue to design abundant and highly active metal‐oxide interfaces for advanced metal catalysis.

中文翻译：

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准双层亚纳米金属-氧化物界面簇催化剂的合成用于高级催化

平面金属团簇具有较高的金属利用率，独特的电子性能和3D对应物的催化功能。然而，由于大大增加的表面自由能，这些材料的合成具有挑战性。据报道，在浸渍过程中利用强静电相互作用和精确控制的CoO _x可以实现二氧化硅支撑的平面双层Pt-CoO _x亚纳米簇，该簇由大约一个Pt原子层和一个CoO _x层组成。涂层采用原子层沉积。这种双层结构已通过电子显微镜和原位X射线吸收精细光谱法明确证实，这是以前从未报道过的。这种合成方法可以扩展到平面金属氧化物亚纳米簇的另外八个排列。由于独特的电子性能和产生的丰富的金属氧化物界面，所得双层催化剂在H _2中的CO优先氧化反应中表现出出色的催化性能。乙炔的选择性加氢和选择性加氢，通过显示出比传统的氧化物涂层3D金属簇/纳米颗粒高出至少8倍和48倍的高得多的选择性和固有活性，突出了双层界面结构的进步。这些发现为设计用于高级金属催化的大量高活性金属氧化物界面开辟了一条新途径。