Preparation and photocatalytic activities of two new Zn-doped SrTiO3 and BaTiO3 photocatalysts for hydrogen production from water without cocatalysts loading
Preparation and photocatalytic activities of two new Zn-doped SrTiO3 and BaTiO3 photocatalysts for hydrogen production from water without cocatalysts loading
复制标题
DOI：
10.1016/j.ijhydene.2012.08.133
复制
发表时间：
2012-11
影响因子：
7.2
通讯作者：
J. Zou;Long-Zhu Zhang;S. Luo;Leipeng Leng;Xubiao Luo;Ming-Jian Zhang;Yan Luo;G. Guo
中科院分区：
文献类型：
--
作者：
J. Zou;Long-Zhu Zhang;S. Luo;Leipeng Leng;Xubiao Luo;Ming-Jian Zhang;Yan Luo;G. Guo
采用溶胶-凝胶法制备了具有钙钛矿结构的Sr2/3Zn1/3TiO3(1)和Ba5/6Zn1/6TiO3(2)，其中a位（分别为1和2的Sr和Ba）部分被锌离子取代。采用粉末x射线衍射、紫外-可见漫反射光谱、扫描电镜、透射电镜和拉曼光谱对光催化剂进行了表征。光催化实验结果表明，在紫外光照射下，1和2均表现出良好的水还原生成h22的活性。与纯srtio3和BaTiO3相比，1和2的产氢效率分别有显著提高。并用理论方法研究了它们的光催化机理。本研究表明，适当离子的取代掺杂可以改变催化剂的晶体和能带结构，并显著促进催化剂中的电子传递，从而使催化剂具有良好的光催化活性。
Sr2/3Zn1/3TiO3(1) and Ba5/6Zn1/6TiO3(2) with perovskite structure have been prepared by a facile sol–gel method, among which the A sites (Sr and Ba for 1 and 2, respectively) were partially replaced by zinc ions. The photocatalysts were characterized by powder X-ray diffraction, UV–vis diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The results of photocatalysis experiment showed that both 1 and 2 exhibited good activity for water reduction to form H2without cocatalysts loading under ultraviolet light irradiation. Compared with pure SrTiO3and BaTiO3, 1 and 2 showed remarkable improvement in H2production efficiency, respectively. And the photocatalytic mechanisms of them were investigated by the theoretical method. This study demonstrated that the substitutional doping of appropriate ions could change the crystal and band structures and significantly promote electron transport in catalysts, which result in their good photocatalytic activities.