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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Mesoporous TiO2 Single-Crystal Polyhedron-Constructed Core-Shell Microspheres: Anisotropic Etching and Photovoltaic Property
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Mesoporous TiO2 Single-Crystal Polyhedron-Constructed Core-Shell Microspheres: Anisotropic Etching and Photovoltaic Property

机译:介孔TiO2单晶多面体构成的核壳微球:各向异性刻蚀和光伏性能。

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摘要

A favorable micro-nanostructure is crucial for obtaining superior properties. However, the synthetic techniques for synthesizing the complex morphology still remain a challenge. In this work, we synthesized core-shellstructured submicrometer-sized mesoporous TiO2 microspheres (MTMs) constructed with mesoporous TiO2 polyhedrons through a novel anisotropic etching route. The outer shell of the obtained TiO2 microsphere is constructed by a mesoporous TiO2 single-crystal nanopolyhedron with exposed (101) facets. Hydrogen peroxide was used as the bubble generator, which simultaneously acted as gas templates for the formation of TiO2 microspheres. Fluorine ions facilitate the formation of anatase (001) facets at the beginning of the reaction. The anisotropic etching accrued along the [101] direction with an increase in fluorine ions, leaving mesoporous structures and highly exposed (101) facets. Dye-sensitized solar cells (DSSCs), using the as-prepared product as a light-scatting layer, showed a 29.4% increase in conversion efficiency.
机译:良好的微纳米结构对于获得优异的性能至关重要。然而,用于合成复杂形态的合成技术仍然是一个挑战。在这项工作中,我们通过新颖的各向异性刻蚀路线合成了由介孔TiO2多面体构成的核-壳结构亚微米级介孔TiO2微球(MTM)。所得的TiO2微球的外壳由具有暴露的(101)小面的介孔TiO2单晶纳米多面体构成。过氧化氢用作气泡发生器,同时用作形成TiO2微球的气体模板。氟离子有助于在反应开始时形成锐钛矿(001)小平面。随着氟离子的增加,沿着[101]方向产生了各向异性蚀刻,从而留下了中孔结构和高度暴露的(101)小平面。使用所制备的产品作为光吸收层的染料敏化太阳能电池(DSSC)显示转换效率提高了29.4%。

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