Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
Beamline Research Division, Pohang Accelerator Laboratory (PAL), POSTECH, Pohang 37673, Republic of Korea.
J Phys Chem Lett. 2023 Jun 15;14(23):5241-5248. doi: 10.1021/acs.jpclett.3c00937. Epub 2023 Jun 1.
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 CuO supports with (100) and (111) facets terminated, respectively, and Pt nanoparticles (NPs) were introduced. The characterizations revealed the facet-dependent encapsulation of the Pt NPs by a CuO layer due to the oxidation of the CuO support during the CO oxidation reaction. The CuO layer on Pt at cubic CuO (Pt/c-CuO) significantly enhanced catalytic performance, while the thicker CuO layer on Pt at octahedral CuO suppressed CO conversion. The formation of a thin CuO layer is attributed to the dominant Pt-O-Cu bond at the Pt/c-CuO interface, which suppresses the adsorption of oxygen molecules. This investigation provides insight into designing high-performance catalysts via engineering the interface interaction.
金属-载体相互作用在确定负载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，改变载体的晶面是一种有前途的催化控制策略。在此，我们分别开发了具有（100）和（111）晶面终止的立方和八面体 CuO 载体，并引入了 Pt 纳米颗粒（NPs）。由于 CO 氧化反应中 CuO 载体的氧化，特征分析表明 Pt NPs 由于 CuO 层的包裹而具有晶面依赖性。在立方 CuO 上的 Pt 中的 CuO 层（Pt/c-CuO）显著提高了催化性能，而在八面体 CuO 上的 Pt 中的较厚的 CuO 层抑制了 CO 的转化。CuO 层的形成归因于 Pt/c-CuO 界面处占主导地位的 Pt-O-Cu 键，该键抑制了氧分子的吸附。这项研究通过工程界面相互作用为设计高性能催化剂提供了深入的了解。
