Template-free synthesis of hierarchical TiO 2 hollow microspheres as scattering layer for dye-sensitized solar cells
Template-free synthesis of hierarchical TiO 2 hollow microspheres as scattering layer for dye-sensitized solar cells
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DOI：
10.1016/j.apsusc.2016.02.049
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发表时间：
2016-04
影响因子：
6.7
通讯作者：
Y. Rui;Linlin Wang;Jiachang Zhao;Hongzhi Wang;Yaogang Li;Qinghong Zhang;Jingli Xu
中科院分区：
文献类型：
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作者：
Y. Rui;Linlin Wang;Jiachang Zhao;Hongzhi Wang;Yaogang Li;Qinghong Zhang;Jingli Xu
采用热水解和溶剂热反应两步法合成了TiO 2多级中空微球。通过硫酸钛的控制热水解，首先得到由无定形颗粒聚集而成的准单分散固体TiO 2微球，然后在随后的溶剂热处理过程中，固体结构转变为中空结构并晶化。样品的SEM和TEM图像显示，形态演化完全符合由内而外的Ostwald熟化机制。丰富的孔隙率和独特的分层中空结构赋予了TiO 2微球108.0 m2 g −1的大比表面积。作为染料敏化太阳能电池的有效阳极材料，TiO 2空心微球表现出良好的染料吸附能力和较强的光散射能力，其能量转换效率可与商用18 NR-T透明二氧化钛相媲美。最后，通过在18 NR-T二氧化钛上涂覆中空微球作为光散射层，双层DSSC实现了7.84%的高效率。
Hierarchical TiO2hollow microspheres were synthesized by a 2-step process consisting of thermal hydrolysis and subsequent solvothermal reaction. Quasi-monodispersed solid TiO2microspheres aggregated by amorphous particles were firstly obtained by the controlled thermal hydrolysis of titanium sulfate, and then the solid structures transformed to hollow ones and crystallized during the subsequent solvothermal treatment. SEM and TEM images of the samples revealed that the morphological evolution was in perfect accordance with the inside-out Ostwald ripening mechanism. The rich porosity and unique hierarchical hollow structure endow the TiO2microspheres with a large specific surface area of 108.0 m2g−1. As an effective anode material for dye-sensitized solar cells, TiO2hollow microspheres showed good capability of dye adsorption and strong light scattering, leading to a comparable energy conversion efficiency to the commercial 18NR-T transparent titania. Finally, a high efficiency of 7.84% was achieved for the bi-layer DSSC by coating the hollow microspheres on top of the 18NR-T titania as the light scattering layer.