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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Sonochemical Deposition of Au Nanoparticles on Different Facets-Dominated Anatase TiO2 Single Crystals and Resulting Photocatalytic Performance
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Sonochemical Deposition of Au Nanoparticles on Different Facets-Dominated Anatase TiO2 Single Crystals and Resulting Photocatalytic Performance

机译：纳米金在不同面晶为主的锐钛矿型TiO2单晶上的声化学沉积及其光催化性能

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摘要

The dependence of Au adhesion and photo-catalytic performance on the support's exposed facets in the Au/TiO2 system is an important consideration in the design of Au/TiO2 heterogeneous catalysts. In this article, we prepared anatase TiO2 single crystals with different percentages of exposed {101} and {001} facets by a hydrothermal process. The uniform deposition of crystalline metallic Au nanoparticles with the mean diameter of 10 to 11 nm onto both exposed {101} and {001} facets of the prepared anatase TiO2 single crystals has been achieved with the aid of power ultrasound. The Au-deposited TiO2 single crystals with the dominant {001} facet have been demonstrated to have much higher plasmon-induced photocatalytic activity than those with the dominant {101} facet for the degradation of 2,4-dichlorophenol. It was revealed that the dominant facet of anatase TiO2 crystal plays a critical role in the plasmon-induced photocatalytic performance of Au/TiO2 system. The {001} facet enhances the efficiency of the interfacial charge-transfer process by offering a stronger adherence for Au nanoparticles than the {101} facet, which promotes the generation of the reactive oxygen species O2~(·-) by the plasmon-induced electron transfer from Au nanoparticles to anatase TiO2 substrate. This work would provide useful guidance for the design of Au/TiO2 heterogeneous photocatalysts.
机译：Au / TiO2体系中Au附着力和光催化性能对载体暴露面的依赖性是Au / TiO2非均相催化剂设计的重要考虑因素。在本文中，我们通过水热法制备了具有不同百分比的{101}和{001}暴露面的锐钛矿型TiO2单晶。借助于功率超声，已经实现了平均直径为10至11nm的结晶金属Au纳米颗粒均匀地沉积在所制备的锐钛矿型TiO 2单晶的暴露的{101}和{001}面上的均匀沉积。已经证明具有优势{001}面的金沉积的TiO 2单晶比具有优势{101}面的等离子体对2,4-二氯苯酚的降解具有更高的等离子体诱导的光催化活性。揭示了锐钛矿型TiO2晶体的主导面在等离激元诱导的Au / TiO2体系的光催化性能中起关键作用。 {001}刻面通过提供比{101}刻面更强的Au纳米颗粒附着力，从而提高了界面电荷转移过程的效率，这促进了等离子体激元诱导的活性氧O2〜（·-）的生成电子从金纳米颗粒转移到锐钛矿型TiO2衬底上。这项工作将为Au / TiO2非均相光催化剂的设计提供有用的指导。

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