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首页> 外文期刊>Crystal growth & design >Microwave-Assisted Topochemical Conversion of Layered Titanate Nanosheets to {010}-Faceted Anatase Nanocrystals for High Performance Photocatalysts and Dye-Sensitized Solar Cells
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Microwave-Assisted Topochemical Conversion of Layered Titanate Nanosheets to {010}-Faceted Anatase Nanocrystals for High Performance Photocatalysts and Dye-Sensitized Solar Cells

机译：微波辅助拓扑化学将层状钛酸酯纳米片转变为{010}-乙酰基锐钛矿纳米晶，用于高性能光催化剂和染料敏化太阳能电池

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摘要

The {010}-faceted anatase nanocrystals with controllable crystal size and morphology were synthesized by microwave hydrothermal treatment of layered titanate nanosheet solutions. The nanostructures and formation reaction mechanism of TiO_2 nanocrystals were investigated using X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and selected-area electron diffraction. Their photocatalytic behavior and dye-sensitized solar cell (DSSC) performance were studied and compared with [111]-faceted anatase nanocrystals and anatase nanocrystals without a specific facet on the surface. There are two kinds of reactions in the formation process of the anatase nanocrystals. One is an in situ topochemical conversion reaction of layered titanate structure to anatase structure, and another is the dissolution?deposition reaction on the particle surface. The microwave hydrothermal process is suitable to control the structural conversion reaction for uniform the crystal size and morphology due to its uniform heating mechanism. The UV?visible spectrum results revealed that the bandgap of the TiO_2 nanocrystals was enhanced in the order of nanocrystal without specific facet < [111]-faceted nanocrystal < {010}-faceted nanocrystal, which corresponded to their photocatalytic activities. The DSSC performance also was enhanced in the same order, suggesting that the {010}-faceted nanocrystals are promising for the high performance DSSCs.
机译：通过对层状钛酸酯纳米片溶液进行微波水热处理，合成了具有可控晶体尺寸和形貌的{010}面锐钛矿纳米晶体。利用X射线衍射，场发射扫描电子显微镜，透射电子显微镜和选择区域电子衍射研究了TiO_2纳米晶体的纳米结构和形成反应机理。研究了它们的光催化行为和染料敏化太阳能电池（DSSC）性能，并将其与[111]切面的锐钛矿纳米晶体和表面没有特定刻面的锐钛矿纳米晶体进行比较。锐钛矿型纳米晶体的形成过程中有两种反应。一种是层状钛酸酯结构到锐钛矿结构的原位拓扑化学转化反应，另一种是在颗粒表面的溶解-沉积反应。微波水热工艺由于其均匀的加热机理，适合于控制结构转化反应，以使晶体尺寸和形态均匀。紫外可见光谱结果表明，TiO_2纳米晶体的能带隙以纳米晶体的顺序增强，而没有特定的面<[111]面的纳米晶体<{010}面的纳米晶体，这与其光催化活性相对应。 DSSC的性能也以相同的顺序增强，表明{010}切面纳米晶体有望用于高性能DSSC。

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