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首页> 外文期刊>Catalysis science & technology >Surface defect-engineered CeO2−x by ultrasound treatment for superior photocatalytic H2 production and water treatment
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Surface defect-engineered CeO2−x by ultrasound treatment for superior photocatalytic H2 production and water treatment

机译：通过超声处理表面缺陷工程CEO2-X，用于上光催化H2的产生和水处理

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摘要

Semiconductor photocatalysts with surface defects display incredible light absorption bandwidth and these defects function as highly active sites for oxidation processes by interacting with the surface band structure. Accordingly, engineering the photocatalyst with surface oxygen vacancies will enhance the semiconductor nanostructure's photocatalytic efficiency. Herein, a CeO2−x nanostructure is designed under the influence of low-frequency ultrasonic waves to create surface oxygen vacancies. This approach enhances the photocatalytic efficiency compared to many heterostructures while keeping the intrinsic crystal structure intact. Ultrasonic waves induce the acoustic cavitation effect leading to the dissemination of active elements on the surface, which results in vacancy formation in conjunction with larger surface area and smaller particle size. The structural analysis of CeO2−x revealed higher crystallinity, as well as morphological optimization and the presence of oxygen vacancies is verified through Raman, X-ray photoelectron spectroscopy, temperature-programmed reduction, photoluminescence, and electron spin resonance analyses. Oxygen vacancies accelerate the redox cycle between Ce4+ and Ce3+ by prolonging photogenerated charge recombination. The ultrasound-treated pristine CeO2 sample achieved excellent hydrogen production showing a quantum efficiency of 1.125% and efficient organic degradation. Our promising findings demonstrated that ultrasonic treatment causes the formation of surface oxygen vacancies and improves photocatalytic hydrogen evolution and pollution degradation.
机译：具有表面缺陷的半导体光催化剂表现出令人难以置信的光吸收带宽，这些缺陷通过与表面带结构相互作用来充当氧化过程的高度活性位点。因此，使用表面氧空位来设计光催化剂将增强半导体纳米结构的光催化效率。在此，在低频超声波的影响下设计了CEO2-X纳米结构，以产生表面氧空位。与许多异质结构相比，这种方法可以提高光催化效率，同时保持内在的晶体结构完整。超声波诱导声气膜效应，导致表面上的活性元件传播，从而导致空缺形成与较大的表面积和较小的粒径结合在一起。 CEO2-X的结构分析表明，通过拉曼，X射线光电学光谱，温度编程的还原，光致发光和电子自旋共振分析来验证较高的结晶度以及形态优化以及氧空位的存在。氧空位通过延长光生电荷重组来加速CE​​4+和CE3+之间的氧化还原循环。超声处理的原始CEO2样品可实现出色的氢产生，显示出1.125％的量子效率和有效的有机降解。我们有希望的发现表明，超声处理会导致表面氧空位的形成，并改善光催化氢的演化和污染降解。

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