The incorporation of oxygen vacancy defects into the catalysts has been attracting significant interest for regulating the performance of photocatalysts. Single-atomic-site metal catalysts have also been paid ever-growing attention because they maximized the atom efficiency and thus generated excellent catalytic performance. Herein, we report the interaction of oxygen vacancy defects and decorated atomically dispersed metal Pt to boost the efficient photocatalytic process. Compared with TiO₂ without oxygen defects, under the same theoretical amount of Pt support, all the oxygen vacancy defect-rich TiO₂ catalysts show excellent photocatalytic H₂ generation and CO₂ reduction performance. On the basis of the experimental characterization and quantum chemical calculations, the introduced oxygen vacancies strongly anchored the single-atom Pt on the surface of the catalyst with enhanced Pt-substrate interactions and thereby avoiding aggregation of Pt atoms, while the loaded single Pt atom favor the generation of more surface and subsurface oxygen vacancies as proved by electron spin resonance and positron annihilation lifetime spectroscopy. This work represents a new heuristic research of the coeffect of the defects and supported single noble metal atom and the rational synthesis of high-efficiency photocatalysts.

中文翻译：

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单原子铂-氧空位缺陷对光分解水H ₂释放和CO ₂光还原作用增强的相互作用：实验和理论研究

将氧空位缺陷结合到催化剂中已经引起了对调节光催化剂性能的极大兴趣。单原子位金属催化剂也已引起越来越多的关注，因为它们使原子效率最大化并因此产生了优异的催化性能。在这里，我们报告氧空位缺陷和装饰原子分散的金属Pt的相互作用，以提高有效的光催化过程。与没有氧缺陷的TiO ₂相比，在相同的Pt载体理论用量下，所有富氧空位缺陷的TiO ₂催化剂均具有优异的光催化H ₂生成和CO _2。降低性能。根据实验表征和量子化学计算，引入的氧空位将单原子Pt牢固地锚定在催化剂表面，具有增强的Pt-底物相互作用，从而避免了Pt原子的聚集，而负载的单个Pt原子有利于电子自旋共振和正电子an没寿命光谱证明了更多的表面和地下氧空位的产生。这项工作代表了对缺陷和负载的单一贵金属原子的协同效应以及高效光催化剂的合理合成的新启发式研究。