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Yolk@shell anatase TiO2 hierarchical microspheres with exposed {001} facets for high-performance dye sensitized solar cells

机译:带有暴露的{001}面的Yolk @ shell锐钛矿型TiO2分层微球,用于高性能染料敏化太阳能电池

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摘要

We report a facile, template-free and nontoxic one-pot solvothermal route for synthesizing submicrometer-sized yolk@shell hierarchical spheres, which possess a permeable shell self-assembled by ultrathin anatase TiO2 nanosheets (NSs) with nearly 90% of exposed {001} facets and mesoporous inner sphere with a high specific surface area. Compared to the {001} faceted TiO2 NSs and standard Degussa P25, the anatase TiO2 yolk@shell hierarchical spheres (TiO2 YSHSs) were obtained with surface area up to 245. 1 m~2 g~(-1) and their submicrometer scale simultaneously promoted light scattering in the visible region. A light to electricity conversion efficiency (η) of 6.01% was achieved for the DSSCs with TiO2 YSHSs as its photoanode, under 100 mW cm~(-2) illumination, indicating 49.9% and 34.8% increases compared to the DSSCs with TiO2 NSs (4.01%) and the standard Degussa P25 (4.46%) as photoanodes, respectively. The enhancement can be mainly attributed to the higher dye loading on TiO2 YSHSs (4.35 × 10~(-5) mol cm~(-2)) than that of TiO2 NSs (3.14 × 10~(-5) mol cm~(-2)) and P25 (3.32 × 10~(-5) mol cm~(-2)); longer lifetime of the injected electrons in TiO2 YSHSs film (65.79 ms) than that of in TiO2 NSs film (57.90 ms); and the good capability of fight scattering of TiO2 YSHSs in visible light region, which are confirmed by UV-vis spectrophotometer and electrochemical impedance spectroscopy (EIS). The growth mechanism of the TiO2 YSHSs has also been investigated in detail.
机译:我们报告了一种简便,无模板且无毒的一锅溶剂热法,用于合成亚微米级的蛋黄@壳层级球体,该球体具有由超薄锐钛矿型TiO2纳米片(NSs)自组装的可渗透壳层,其中近90%的暴露{001 }具有高比表面积的小面和中孔内球。与{001}多面TiO2 NSs和标准Degussa P25相比,获得了锐钛型TiO2卵黄壳分层球(TiO2 YSHSs),其表面积高达245. 1 m〜2 g〜(-1),同时具有亚微米级。促进光在可见光区域的散射。以TiO2 YSHSs为光阳极的DSSC,在100 mW cm〜(-2)的光照下,光电转换效率(η)为6.01%,与具有TiO2 NSs的DSSC相比,分别提高了49.9%和34.8%( 4.01%)和标准Degussa P25(4.46%)作为光阳极。增强主要归因于TiO2 YSHSs上的染料负载(4.35×10〜(-5)mol cm〜(-2))比TiO2 NSs(3.14×10〜(-5)mol cm〜(-)高2))和P25(3.32×10〜(-5)mol cm〜(-2)); TiO2 YSHSs薄膜中注入电子的寿命(65.79 ms)比TiO2 NSs薄膜中注入电子的寿命(57.90 ms)更长;紫外可见分光光度计和电化学阻抗谱(EIS)证实了TiO2 YSHSs在可见光区域具有良好的抗散射能力。还详细研究了TiO2 YSHSs的生长机理。

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