异相结 TiO2 的氧空位缺陷工程：界面/表面氧空位共同调节光催化 ROS 的产生,ACS Applied Energy Materials

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异相结 TiO2 的氧空位缺陷工程：界面/表面氧空位共同调节光催化 ROS 的产生
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-12-30 , DOI: 10.1021/acsaem.2c03535
Xiaoshuang Kang ₁ , Guohui Dong ₁ , Tingting Dong ₁

Affiliation

在本研究中，TiO ₂样品通过水解和煅烧两个阶段合成。发现在水解阶段加入HCl可以促进异相结TiO ₂的形成。通过在氩气气氛中在 300 °C 下退火，可以在异相结 TiO ₂中构建界面氧空位 (Vo) 和表面 Vo（分布在锐钛矿相中）。经过光催化实验，可以发现表面Vo和界面Vo在光催化活性氧（ROSs）的产生中具有协同作用。表面Vo可以使O ₂富集，并将电子传输给锐钛矿表面的O _{2 。}因此，富集的 O ₂可以很容易地转化为^• O ₂^–和¹ O ₂。界面Vo不仅促进了两相之间的电子传输，而且将电子传输模式从I型转变为Z型。因此，界面 Vo 使光生电子转移到锐钛矿，光生空穴留在金红石中。金红石部分的这些空穴具有很高的氧化电位，可以更好地将H ₂ O（或OH ^-）分子氧化成^• OH。它们还可以将^• O ₂^–氧化为¹ O ₂. 该工作促进了光催化材料缺陷设计和应用的进一步发展。

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Oxygen Vacancy Defect Engineering of Heterophase Junction TiO2: Interfacial/Surface Oxygen Vacancies Coadjust the Photocatalytic ROS Production

In this study, TiO₂ samples are synthesized through two stages including hydrolysis and calcination. It is found that the addition of HCl in the hydrolysis stage could facilitate the formation of heterophase junction TiO₂. By annealing at 300 °C in an argon atmosphere, interfacial oxygen vacancies (Vo) and surface Vo (distributed in the anatase phase) can be constructed in the heterophase junction TiO₂. After photocatalytic experiments, it can be found that surface Vo and interface Vo have a synergistic effect in the production of photocatalytic reactive oxygen species (ROSs). Surface Vo can enrich O₂ and transmit electrons to O₂ on the surface of anatase. Therefore, the enriched O₂ can be converted into ^•O₂^– and ¹O₂ easily. The interfacial Vo not only facilitate the electron transmission between the two phases but also change the electron transfer mode from I-scheme to Z-scheme. Thus, interfacial Vo make photogenerated electrons transfer to anatase and photogenerated holes leave in the rutile. These holes in the rutile part have high oxidation potential and can better oxidize H₂O (or OH^–) molecules to ^•OH. They can also oxidize ^•O₂^– to ¹O₂. This work promotes the further development of defect design and application in photocatalytic materials.

更新日期：2022-12-30

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