Macro-mesoporous TiO2 Microspheres for Highly Efficient Dye-Sensitized Solar Cells

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• 作者：Pengfei Liu ; Yunfeng Li ; Yanjie Hu ; Xiaoyu Hou ; Chunzhong Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 8, 2015
• 年：2015
• 卷：54
• 期：26
• 页码：6692-6697
• 全文大小：366K
• ISSN：1520-5045

文摘

In this work, the novel macro-mesoporous TiO₂ microspheres (MMTMs) have been synthesized via a spray drying route with fumed silica (FS) as template, followed by calcination and etching. The as-synthesized MMTMs have unique bimodal porous structures of macropores origin from FS template and mesopores accumulated by TiO₂ nanoparticles. The macro-mesoporous structure endows the TiO₂ microspheres with better surface area and wonderful light scattering property. When MMTMs are employed as the photoelectrodes of dye-sensitized solar cells, short-circuit current and open-circuit voltage are both improved and the high power conversion efficiency of 8.68% is obtained eventually, which is much higher than P25 photoelectrode. The excellent performance can be attributed to the excellent light-scattering property, better diffusion of electrolyte as well as superior electron transport owing to the unique bimodal pore structure and the dense packed of the internal nanoparticles of MMTMs.