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首页> 外文期刊>RSC Advances >Efficiently enhancing the photocatalytic activity of faceted TiO2 nanocrystals by selectively loading α-Fe2O3 and Pt co-catalysts
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Efficiently enhancing the photocatalytic activity of faceted TiO2 nanocrystals by selectively loading α-Fe2O3 and Pt co-catalysts

机译：通过选择性加载α-Fe 2 O 3和Pt催化剂，有效地增强刻面TiO2纳米晶体的光催化活性

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摘要

The loading of oxidation and/or reduction co-catalysts onto the surface of semiconductor nanomaterials is one of the most efficient methods of improving the performance of semiconductor-based photocatalysts. However, in most of cases, the enhancing effect can be weakened by a random co-catalyst loading method because the different roles of photocatalyst facets in the photocatalytic process are not simultaneously considered. In this paper, a ternary composite photocatalyst, Fe _(2) O _(3) –TiO _(2) –Pt, with α-Fe _(2) O _(3) and Pt nanoparticles selectively deposited onto the {001} and {101} facets of TiO _(2) , respectively, was successfully constructed using the facet-induced photogenerated electrons and holes of well-faceted anatase TiO _(2) nanocrystals as natural redox agents. The overall photocatalytic activity of this well-designed composite photocatalyst in H _(2) production has been enhanced greatly by as much as 2.2 times and 30 times compared to the photocatalysts loaded randomly and without a co-catalyst, respectively. The enhanced photocatalytic activity of Fe _(2) O _(3) –TiO _(2) –Pt was attributed to the remarkably enhanced separation of photogenerated charge carriers with the excitation of UV light.
机译：将氧化和/或还原助催化剂的加载到半导体纳米材料表面上是提高基于半导体光催化剂的性能的最有效方法之一。然而，在大多数情况下，可以通过随机助催化剂加载方法削弱增强效果，因为不同时考虑光催化过程中的光催化方面的不同作用。本文中，三元复合光催化剂，Fe _（2）O _（3）-TiO _（2）-pt，用α-Fe _（2）O _（3）和Pt纳米粒子选择性地沉积在{001上分别使用小相诱导的光生成的电子和孔纳米晶体作为天然氧化还原剂的刻划锐钛矿TiO _（2）纳米晶体的孔成功地构建了TiO _（2）的{101}突起。与随机催化剂的光催化剂相比，在H _（2）的生产精良的复合光催化剂的整体光催化活性大大提高了2.2倍，而无需助催化剂的光催化剂。 Fe _（2）O _（3）-TiO _（2）-pt的增强的光催化活性归因于紫外光的激发光源电荷载流子的显着增强。

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