Graphene Oxide-Assisted Synthesis of Microsized Ultrathin Single-Crystalline Anatase TiO2 Nanosheets and Their Application in Dye-Sensitized Solar Cells

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• 作者：Biao Chen ; Junwei Sha ; Wei Li ; Fang He ; Enzuo Liu ; Chunsheng Shi ; Chunnian He ; Jiajun Li ; Naiqin Zhao
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 3, 2016
• 年：2016
• 卷：8
• 期：4
• 页码：2495-2504
• 全文大小：612K
• ISSN：1944-8252

文摘

High-quality microsized ultrathin single-crystalline anatase TiO₂ nanosheets (MS-TiO₂) with exposed {001} facets were synthesized by a facile and low-cost two-step process that combines a graphene oxide (GO)-assisted hydrothermal method with calcination. Both GO and HF play an important role in the formation of well dispersed MS-TiO₂. As a novel microsized (1–4 μm) ultrathin two-dimensional (2D) material, MS-TiO₂ possesses much higher lateral size and aspect ratio compared to common 2D nanosized (30–60 nm) ultrathin TiO₂ nanosheets (NS-TiO₂), resulting in excellent electronic conductivity and superior electron transfer and diffusion properties. Here, we fabricated MS-TiO₂ and NS-TiO₂, both of which were incorporated with the TiO₂ nanoparticles (P25) to constitute the hybrid photoanode of dye-sensitized solar cells (DSSCs), and explored the effect of the lateral size (nano- and micro-) of ultrathin TiO₂ nanosheets on their electron transfer and diffusion properties. Benefiting from the faster electron transfer rate and short diffusion path of the MS-TiO₂, the MS-TiO₂/P25 gains the more superior performance compared to pure P25 and NS-TiO₂/P25 in the application of DSSCs. Moreover, it is expected that the novel high aspect ratio MS-TiO₂ may be applied in diverse fields including photocatalysis, photodetectors, lithium-ion batteries and others concerning the environment and energy.