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Preparation of tabular TiO2–SrTiO3?δ composite for photocatalytic electrode

机译：片状TiO2-SrTiO3？δ复合材料的光催化电极制备

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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 TiO2 and several alkaline-earth titanates. In this study, the preparation of tabular composite consisting of TiO2 and SrTiO3?δ was examined focusing on morphologies and crystallographic features of oxides. The ideal configuration of tabular composite is the layered structure of n-type TiO2+-type semiconductor/metal or the mixed one partially containing such structure pass. The tabular composite was prepared by an oxidation of metallic Ti chips covered with SrCO3 powder. By such simple preparation method, the composite with designed oxides such as TiO2 and SrTiO3?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 TiO2 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 TiO2 layer on the surface of SrTiO3?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，我们已经研究了由TiO 2 和几种碱土钛酸盐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 3αδ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。平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的混合结构。通过氧化覆有SrCO 3 粉末的金属Ti片制备板状复合材料。通过这种简单的制备方法，在Ti衬底上获得了具有设计氧化物如TiO 2 和SrTiO 3αδ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，氧化物的晶粒尺寸约为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基体的强烈影响。和氧化温度。通过酸溶液处理法制备了SrTiO 3αδ相表面的TiO 2 薄层，得到了复合材料的设计构型。

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