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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Annealing-free preparation of anatase TiO2 nanopopcorns on Ti foil via a hydrothermal process and their photocatalytic and photovoltaic applications
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Annealing-free preparation of anatase TiO2 nanopopcorns on Ti foil via a hydrothermal process and their photocatalytic and photovoltaic applications

机译：水热法在钛箔上无退火制备锐钛矿型TiO2纳米爆米花及其光催化和光伏应用

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摘要

Uniform and well-defined nanopopcorns of the tetragonal anatase TiO2 having an average diameter of 670 nm have been facilely grown on Ti foil via a hydrothermal method and characterized by analyzing electron microscopic images and electron diffraction patterns as well as X-ray photoelectron, photoluminescence, and Raman spectra. The morphology of TiO2 nanostructures on Ti foil has been controlled well by adjusting the volume ratio of H2O2 : HF: H2O, VR(H2O2 : HF : H2O). Truncated tetragonal pyramidal TiO2 nanocrystals exposing the {001} and {101} facets have grown on the surface of TiO2 nanostructures exposing the {001} facets to produce anatase TiO2 nanopopcorns. Without being treated via any annealing process, our well-defined TiO2 nanopopcorns on Ti foil have been directly employed for photocatalytic materials and dye-sensitized solar cells. Among our prepared samples, anatase TiO2 nanopopcorns grown on Ti foil at a VR(H2O2 : HF: H2O) of 1 :1 :1000 have shown the most reduced oxygen vacancy luminescence, the highest photocatalytic activity for the degradation of methylene blue, and the highest photovoltaic conversion efficiency of 3.98% as the working electrode of a dye-sensitized solar cell.
机译：通过水热法在Ti箔上容易地生长出平均直径为670 nm的均匀且定义明确的四方锐钛矿型TiO2纳米爆米花，并通过分析电子显微镜图像和电子衍射图以及X射线光电子，光致发光，和拉曼光谱。通过调节H2O2∶HF∶H2O，VR（H2O2∶HF∶H2O）的体积比，可以很好地控制钛箔上TiO2纳米结构的形貌。暴露{001}和{101}小平面的截顶四角锥状TiO2纳米晶体已经生长在暴露{001}小平面的TiO2纳米结构的表面上，以产生锐钛矿型TiO2纳米爆米花。无需经过任何退火工艺即可处理，我们在Ti箔上定义明确的TiO2纳米爆米花直接用于光催化材料和染料敏化太阳能电池。在我们准备的样品中，以1：1：1000的VR（H2O2：HF：H2O）生长在Ti箔上的锐钛矿型TiO2纳米爆米花显示出最大的氧空位发光度降低，最高的亚甲基蓝降解光催化活性，以及作为染料敏化太阳能电池的工作电极，其最高的光电转换效率为3.98％。

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