The metal–support interaction plays a crucial role in determining the catalytic activity of supported metal catalysts. Changing the facet of the support is a promising strategy for catalytic control via constructing a well-defined metal–support nanostructure. Herein, we developed cubic and octahedral Cu₂O supports with (100) and (111) facets terminated, respectively, and Pt nanoparticles (NPs) were introduced. The in situ characterizations revealed the facet-dependent encapsulation of the Pt NPs by a CuO layer due to the oxidation of the Cu₂O support during the CO oxidation reaction. The CuO layer on Pt at cubic Cu₂O (Pt/c-Cu₂O) significantly enhanced catalytic performance, while the thicker CuO layer on Pt at octahedral Cu₂O suppressed CO conversion. The formation of a thin CuO layer is attributed to the dominant Pt–O–Cu bond at the Pt/c-Cu₂O interface, which suppresses the adsorption of oxygen molecules. This investigation provides insight into designing high-performance catalysts via engineering the interface interaction.

中文翻译：

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小平面控制的 Cu2O 载体增强了 Pt 纳米颗粒对 CO 氧化的催化活性

金属-载体相互作用在决定负载型金属催化剂的催化活性方面起着至关重要的作用。通过构建明确定义的金属载体纳米结构，改变载体的面是一种很有前途的催化控制策略。在此，我们开发了分别终止于 (100) 和 (111) 小平面的立方和八面体 Cu _{2 O 载体，并引入了 Pt 纳米粒子 (NPs)。}原位表征表明，由于CO 氧化反应期间Cu _{2 O 载体的氧化}， CuO 层对 Pt NP 的小平面依赖性封装。Pt 上的 CuO 层为立方 Cu ₂ O (Pt/c-Cu _{2O) 显着提高了催化性能，而八面体 Cu 2} O上 Pt 上较厚的 CuO 层抑制了 CO 转化。CuO 薄层的形成归因于 Pt/c-Cu ₂ O 界面上占主导地位的 Pt-O-Cu 键，它抑制了氧分子的吸附。这项研究提供了通过设计界面相互作用来设计高性能催化剂的见解。