• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Facile fabrication of anatase TiO_2 microspheres on solid substrates and surface crystal facet transformation from {001} to {101}
【24h】

Facile fabrication of anatase TiO_2 microspheres on solid substrates and surface crystal facet transformation from {001} to {101}

机译：在固体基质上方便地制备锐钛矿型TiO_2微球，表面晶面从{001}转变为{101}

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Anatase TiO_2 microspheres with controlled surface morphologies and exposed crystal facets were directly synthesized on metal titanium foil substrates by means of a facile, one-pot hydrothermal method without use of any templating reagent. The obtained products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelecron spectroscopy (XPS), and the focused ion beam (FIB) technique. The sizes of the resultant microspheres ranged from 1.1 to 2.1 μm. The transformation of anatase TiO_2 microspheres with exposed {001} facets surface to nanosheets surface with {101} facets was achieved by simply controlling the hydrothermal reaction time. The anatase TiO_2 microspheres with exposed square-shaped plane {001} facets were obtained by controlling the reaction time at 1 h. The prolonged reaction time transforms the anatase TiO_2 microspheres with exposed square-shaped plane {001} facets to eroded {001} facets then to a nanosheet surface with exposed {101} facets. With hydrothermal synthesis, the surface morphological structure and crystal facets formation are highly dependent on dissolution/deposition processes, which can be strongly influenced by attributes, such as pH of the reaction media, the total concentration of dissolved and suspended titanium species, and the concentration of fluoride in the reaction solution. The changes of these attributes during the hydrothermal process were therefore measured and used to illustrate the morphology and crystal-facet transformation processes of anatase TiO_2 microspheres. The surface morphologies and crystal-facet transformations during hydrothermal processes were found to be governed by the compositional changes of the reaction media, driven by dynamically shifted dissolution/deposition equilibria. The photocatalytic activities of the photoanodes made of anatase TiO_2 microspheres were evaluated. The experimental results demonstrated that the photocatalytic activity of anatase TiO_2 microspheres with exposed {001} facets was found to be 1.5 times higher than that of the anatase TiO _2 microspheres with exposed {101} facets.
机译：通过简便的一锅水热法，无需使用任何模板试剂，即可在金属钛箔基底上直接合成具有可控表面形态和裸露晶面的锐钛矿型TiO_2微球。使用X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线光电子能谱（XPS）和聚焦离子束（FIB）技术对获得的产物进行表征。所得微球的尺寸为1.1至2.1μm。通过简单地控制水热反应时间，可以将具有暴露的{001}小平面的锐钛矿型TiO_2微球转变为具有{101}小平面的纳米片表面。通过控制反应时间为1 h，获得了具有暴露的方形平面{001}面的锐钛矿型TiO_2微球。延长的反应时间将具有暴露的方形平面{001}小平面的锐钛矿型TiO_2微球转变为受腐蚀的{001}小平面，然后转变为具有暴露的{101}小平面的纳米片表面。通过水热合成，表面形态结构和晶体小面的形成高度依赖于溶解/沉积过程，这会受到诸如反应介质的pH，溶解和悬浮的钛物种的总浓度以及浓度等属性的强烈影响。反应溶液中的氟化物。因此测量了这些属性在水热过程中的变化，并用于说明锐钛矿型TiO_2微球的形貌和晶面转变过程。发现水热过程中的表面形态和晶面转变受动态变化的溶解/沉积平衡驱动的反应介质组成变化的控制。评价了由锐钛矿型TiO_2微球制备的光阳极的光催化活性。实验结果表明，发现{001}面暴露的锐钛矿型TiO_2微球的光催化活性比{101}面暴露的锐钛矿型TiO_2微球的光催化活性高1.5倍。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号