Microstructure and photocatalytic properties of WO3/TiO2 composite films by plasma electrolytic oxidation
Microstructure and photocatalytic properties of WO3/TiO2 composite films by plasma electrolytic oxidation
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DOI：
10.1016/j.matchemphys.2011.04.011
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发表时间：
2011-09-15
影响因子：
4.6
通讯作者：
Zhang, D. Q.
中科院分区：
文献类型：
--
作者：
He, J.;Luo, Q.;Zhang, D. Q.
采用等离子体电解氧化法，在不同钨酸盐浓度的电解液中制备了WO 3/TiO 2复合薄膜。采用SEM、AFM、EDX、XRD、XPS、UV-vis DRS和PL等手段对薄膜的形貌、成分、晶体结构和物理性能进行了表征，采用ATR-IR对薄膜的表面酸性进行了研究。当钨酸盐浓度较低时，WO 3/TiO 2薄膜中的钨物种分布均匀，而当钨酸盐浓度较高时，WO 3/TiO 2薄膜中的钨物种分布均匀。在最佳钨酸盐浓度下制备的WO 3/TiO 2薄膜中，掺杂量最大，表面酸性最强，有效抑制了空穴和电子的复合。然而，耦合-WO 3没有移动的光学吸收到可见光区。光催化活性的提高主要归因于表面酸性的提高、光生载流子间的良好分离以及表面活性剂的含量增加。(C)2011 Elsevier B. V.保留所有权利。
WO3/TiO2 composite films were prepared by plasma electrolytic oxidation in electrolytes containing different tungstate concentration. The morphology, topography, compositions, crystal structure and photophysical properties of films were characterized by SEM, AFM, EDX, XRD, XPS, UV-vis DRS and PL, the surface acidity of films was investigated by ATR-IR. The results showed porous films formed on the titanium substrate, consisted of Ti, O and W, and presented mixed crystal of anatase and rutile. Tungsten species were well-dispersed for WO3/TiO2 film formed in lower tungstate concentration, but were in crystalline WO3 in higher concentration. For WO3/TiO2 film prepared in optimal tungstate concentration, the highest content of anatase and the maximum surface acidity were obtained, and the recombination of holes and electrons was effectively inhibited. However, coupled-WO3 did not shift the optical absorption to the visible region. The improvement of photocatalytic activity was attributed to the increased surface acidity, better separation between photo-induced carriers and higher content of anatase. (C) 2011 Elsevier B.V. All rights reserved.