Significance of Epitaxial Growth of PtO2 on Rutile TiO2 for Pt/TiO2 Catalysts,Journal of the American Chemical Society

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Significance of Epitaxial Growth of PtO2 on Rutile TiO2 for Pt/TiO2 Catalysts
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2024-02-02 , DOI: 10.1021/jacs.3c10659
Xuan Tang _{1,

2} , Anwen Yu _{1,

2} , Qianqian Yang ₃ , Haiyang Yuan ₃ , Zhaohua Wang ₄ , Junzhong Xie ₄ , Lihui Zhou ₁ , Yun Guo ₂ , Ding Ma ₄ , Sheng Dai ₁

Affiliation

TiO₂-supported Pt species have been widely applied in numerous critical reactions involving photo-, thermo-, and electrochemical-catalysis for decades. Manipulation of the state of the Pt species in Pt/TiO₂ catalysts is crucial for fine-tuning their catalytic performance. Here, we report an interesting discovery showing the epitaxial growth of PtO₂ atomic layers on rutile TiO₂, potentially allowing control of the states of active Pt species in Pt/TiO₂ catalysts. The presence of PtO₂ atomic layers could modulate the geometric configuration and electronic state of the Pt species under reduction conditions, resulting in a spread of the particle shape and obtaining a Pt/PtO₂/TiO₂ structure with more positive valence of Pt species. As a result, such a catalyst exhibits exceptional electrocatalytic activity and stability toward hydrogen evolution reaction, while also promoting the thermocatalytic CO oxidation, surpassing the performance of the Pt/TiO₂ catalyst with no epitaxial structure. This novel epitaxial growth of the PtO₂ structure on rutile TiO₂ in Pt/TiO₂ catalysts shows its potential in the rational design of highly active and economical catalysts toward diverse catalytic reactions.

中文翻译：

PtO2 在金红石型 TiO2 上外延生长对于 Pt/TiO2 催化剂的意义

几十年来，TiO ₂负载的Pt物质已广泛应用于涉及光催化、热催化和电化学催化的许多关键反应。 Pt/TiO ₂催化剂中Pt物质状态的调控对于微调其催化性能至关重要。在这里，我们报告了一个有趣的发现，显示 PtO ₂原子层在金红石 TiO ₂上外延生长，可能允许控制 Pt/TiO ₂催化剂中活性 Pt 物种的状态。 PtO ₂原子层的存在可以在还原条件下调节Pt物质的几何构型和电子态，导致颗粒形状的扩展并获得具有更多Pt物质正价的Pt/PtO ₂ /TiO ₂结构。因此，这种催化剂对析氢反应表现出优异的电催化活性和稳定性，同时还促进热催化CO氧化，超越了无外延结构的Pt/TiO ₂催化剂的性能。 Pt/TiO ₂催化剂中PtO ₂结构在金红石TiO ₂上的新型外延生长显示了其在合理设计高活性且经济的催化剂以实现多种催化反应方面的潜力。

更新日期：2024-02-02

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