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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Precursor-directed synthesis of well-faceted brookite TiO2 single crystals for efficient photocatalytic performances
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Precursor-directed synthesis of well-faceted brookite TiO2 single crystals for efficient photocatalytic performances

机译：前驱体导向的高效切面板钛矿TiO2单晶的合成具有高效的光催化性能

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摘要

Brookite-TiO2 is a promising next-generation semiconductor material for solar energy conversion, but it suffers from difficulty in achieving high quality and phase purity due to its metastable characteristics. Long-chain fatty acid modification or surfactant assisted methods could orient the growth of brookite; however, purifying the products is complicated and the surface reactivity is invariably undermined. Herein, we demonstrate the design and tuneable synthesis of brookite nanostructures with geometric features of quasi-octahedral (QO), ellipsoid-tipped (ET) and wedge-tipped (WT) nanorods that are exposed primarily with {210} facet via water-soluble titanium precursors. When tested as a photocatalyst for hydrogen evolution from water or for the degradation of organic pollutants, QO brookite nanocrystals exhibited the highest catalytic activity compared to ET and WT nanorod counterparts. This observation could be due to the redox facets that form a "surface-heterojunction" and promote the separation of photogenerated carriers. The precursor-directed method reported here may usher in a new phase for the synthesis of novel metastable nanocrystals with specific facet exposure that are highly useful for applications in energy conversion and environment protection.
机译：板钛矿-TiO 2是用于太阳能转化的有前景的下一代半导体材料，但是由于其亚稳的特性，其难以获得高质量和相纯度。长链脂肪酸改性或表面活性剂辅助的方法可以使板钛矿的生长定向。然而，纯化产物很复杂并且表面反应性总是受到损害。本文中，我们演示了具有几何特征的准八面体（QO），椭圆形尖端（ET）和楔形尖端（WT）纳米棒的板钛矿纳米结构的设计和可调谐合成，这些纳米棒主要通过水溶性的{210}面暴露钛前体。当作为光催化剂从水中释放氢或降解有机污染物时，与ET和WT纳米棒相比，QO板钛矿纳米晶体显示出最高的催化活性。该观察结果可能是由于氧化还原面形成了“表面异质结”并促进了光生载流子的分离。本文报道的前体导向方法可能会为合成具有特定刻面暴露的新型亚稳态纳米晶体开辟一个新阶段，这对于能量转换和环境保护中的应用非常有用。

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