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首页> 外文期刊>Advanced energy materials >Ligand-Assisted Assembly Approach to Synthesize Large-Pore Ordered Mesoporous Titania with Thermally Stable and Crystalline Framework
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Ligand-Assisted Assembly Approach to Synthesize Large-Pore Ordered Mesoporous Titania with Thermally Stable and Crystalline Framework

机译：配体辅助组装方法合成具有热稳定和结晶骨架的大孔有序介孔二氧化钛

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摘要

A novel ligand-assisted assembly approach is demonstrated for the synthesis of thermally stable and large-pore ordered mesoporous titanium dioxide with a highly crystalline framework by using diblock copolymer poly(ethylene oxide)-b-polystyrene (PEO-b-PS) as a template and titanium isopropoxide (TIPO) as a precursor. Small-angle X-ray scattering, X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution scanning electron microscopy, and N2-sorption measurements indicate that the obtained TiO2 materials possess an ordered primary cubic mesostructure with large, uniform pore diameters of about 16.0 nm, and high Brunauer–Emmett–Teller surface areas of ∼112 m2 g−1, as well as high thermal stability (∼700 °C). High resolution TEM and wide-angle XRD measurements clearly illustrate the high crystallinity of the mesoporous titania with an anatase structure in the pore walls. It is worth mentioning that, in this process, in addition to tetrahydrofuran as a solvent, acetylacetone was employed as a coordination agent to avoid rapid hydrolysis of the titanium precursor. Additionally, stepped evaporation and heating processes were adopted to control the condensation rate and facilitate the assembly of the ordered mesostructure, and ensure the formation of fully polycrystalline anatase titania frameworks without collapse of the mesostructure. By employing the obtained mesoporous and crystallized TiO2 as the photoanode in a dye-sensitized solar cell, a high power-conversion efficiency (5.45%) can be achieved in combination with the N719 dye, which shows that this mesoprous titania is a great potential candidate as a catalyst support for photonic-conversion applications.
机译：通过使用二嵌段共聚物聚（环氧乙烷）-b-聚苯乙烯（PEO-b-PS）作为单体，证明了一种新颖的配体辅助组装方法，该方法可合成具有高结晶骨架的热稳定大孔有序介孔二氧化钛。模板和异丙醇钛（TIPO）作为前体。小角X射线散射，X射线衍射（XRD），透射电子显微镜（TEM），高分辨率扫描电子显微镜和N2吸附测量表明，所获得的TiO2材料具有有序的初级立方介观结构，具有较大的，均匀的孔径约为16.0 nm，Brunauer-Emmett-Teller的表面积大，约为112 m2 g-1，并且具有很高的热稳定性（约700°C）。高分辨率TEM和广角XRD测量清楚地表明了介孔二氧化钛的高结晶度，其孔壁中具有锐钛矿结构。值得一提的是，在该方法中，除了使用四氢呋喃作为溶剂外，还使用乙酰丙酮作为配位剂，以避免钛前体的快速水解。此外，采用分步蒸发和加热工艺来控制冷凝速率并促进有序介观结构的组装，并确保形成完整的多晶锐钛矿二氧化钛骨架而不会破坏介观结构。通过将获得的介孔和结晶的TiO2用作染料敏化太阳能电池中的光阳极，与N719染料结合使用可实现高功率转换效率（5.45％），这表明该介孔二氧化钛是巨大的潜在候选物作为光子转换应用的催化剂载体。

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  • 来源
    《Advanced energy materials》 |2011年第2期|1-8|共8页
  • 作者

    Junyong Zhang; Yonghui Deng; Dong Gu; Shutao Wang; Lan She; Renchao Che; Zhong-Sheng Wang; Bo Tu; Songhai Xie; Dongyuan Zhao;

  • 作者单位

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

    Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Advanced Materials Laboratory Fudan University Shanghai 200433 P.R. China;

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  • 正文语种 eng
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  • 关键词

    assembly; ligands; mesoporous materials; synthesis; titania;

    机译：组装;配体;多孔材料;合成;二氧化钛;

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