• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Science and Technology of Advanced Materials >Preparation of tabular TiO_2-SrTiO_(3 - δ) composite for photocatalytic electrode
【24h】

Preparation of tabular TiO_2-SrTiO_(3 - δ) composite for photocatalytic electrode

机译：片状TiO_2-SrTiO_（3-δ）复合材料的光催化电极制备

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

To improve the efficiency of photo-induced reactions, the recombination of photogenerated electrons and holes in semiconductor must be suppressed. We have proposed that the utilisation of n~+ heterogeneous junction which yields a large potential gradient in the junction region. Up to now, we have studied the superiority of such junctions in the photocatalytic reaction using composite particles consisting of TiO_2 and several alkaline-earth titanates. In this study, the preparation of tabular composite consisting of TiO_2 and SrTiO_(3 - δ) was examined focusing on morphologies and crystallographic features of oxides. The ideal configuration of tabular composite is the layered structure of n-type TiO_2~+-type semiconductor/metal or the mixed one partially containing such structure pass. The tabular composite was prepared by a oxidation of metallic Ti chips covered with SrCO_3 powder. By such simple preparation method, the composite with designed oxides such asTiO_2 and SrTiO_(3 - δ) was obtained on the Ti substrates. The grain size and the volume fraction of constituent oxides depend strongly on the oxidation temperature. When the composite is prepared at 1173 K, the grain size of oxides is measured to be about 0.5-1.0 μm. In contrast, a remarkable grain coarsening and an increase in the volume fraction of TiO_2 can be observed in the oxidation at 1273 K. Furthermore, the developed texture of composite was strongly influenced by that of the Ti substrates and the oxidation temperature. Thin TiO_2 layer on the surface of SrTiO_(3 - δ) phase was prepared by acid solution treatment, the designed configuration of composites could be obtained.
机译：为了提高光致反应的效率，必须抑制光生电子与半导体中空穴的复合。我们提出利用n〜+ / n异质结，在结区产生大的电位梯度。到目前为止，我们已经研究了使用由TiO_2和几种碱土钛酸酯组成的复合颗粒在光催化反应中这种连接的优越性。本文研究了由TiO_2和SrTiO_（3-δ）组成的平板状复合材料的制备，重点研究了氧化物的形貌和晶体学特征。板状复合材料的理想构型是n型TiO_2 / n〜+型半导体/金属的层状结构或部分包含这种结构通道的混合结构。通过氧化覆盖有SrCO_3粉末的金属Ti碎片来制备板状复合材料。通过这种简单的制备方法，在Ti基体上获得了具有设计氧化物如TiO_2和SrTiO_（3-δ）的复合材料。组成氧化物的晶粒尺寸和体积分数在很大程度上取决于氧化温度。当在1173 K下制备复合材料时，氧化物的粒径被测量为约0.5-1.0μm。相比之下，在1273 K的氧化中可以观察到明显的晶粒粗化和TiO_2的体积分数的增加。此外，复合材料的发展织构受到Ti衬底的织构和氧化温度的强烈影响。通过酸溶液处理，在SrTiO_（3-δ）相的表面制备了TiO_2薄层，得到了复合材料的设计构型。

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