Laser assisted chemical vapor deposition of nanostructured NaTaO3 and SrTiO3 thin films for efficient photocatalytic hydrogen evolution
Laser assisted chemical vapor deposition of nanostructured NaTaO3 and SrTiO3 thin films for efficient photocatalytic hydrogen evolution
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DOI：
10.1016/j.fuel.2017.02.016
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发表时间：
2017-06-01
期刊：
影响因子：
7.4
通讯作者：
Goto, Takashi
中科院分区：
文献类型：
--
作者：
Huerta-Flores, Ali M.;Chen, Jianchao;Goto, Takashi
在这项工作中，我们报告的纳米结构的NaTaO 3和SrTiO 3薄膜的制备不锈钢基板上的激光辅助化学气相沉积（LCVD）和它们的应用作为光催化剂在紫外光下的析氢。讨论了沉积条件对材料组成和微观结构的影响，并通过X射线衍射（XRD）、扫描电子显微镜（SEM）、紫外-可见漫反射光谱（DRS）、透射电子显微镜（TEM）和透射电子显微镜（TEM）等手段，综合研究了薄膜的结构、形貌、光学和光电化学性质对其催化制氢活性的影响。光致发光光谱（PL）和电化学阻抗谱（EIS）分析。LCVD工艺允许生长具有用于光催化应用的有吸引力的微结构的膜，导致在正交晶系NaTaO 3的情况下的屋顶状形态和立方晶系SrTiO 3的菜花状形态，这促进了增强的电荷分离和转移过程以及与制备为粉末的光催化剂相比更高的光催化效率。正交相NaTaO 3的析氢速率为5672 lmol g（1）h（1），SrTiO 3的析氢速率仅为494 lmol g（1）h（1），这明显高于制备为粉末的材料的活性。这主要归功于LCVD法制备的薄膜的微观结构及其优越的上级光学、结构和光电化学性能。通过LCVD法制备的薄膜的催化活性的评价结果表明，与通过替代方法制备的类似材料相比，获得了具有竞争力性能的稳定的光催化剂。(C)2017爱思唯尔有限公司版权所有
In this work, we report the preparation of nanostructured NaTaO3 and SrTiO3 thin films on stainless steel substrates by laser assisted chemical vapor deposition (LCVD) and their application as photocatalysts for hydrogen evolution under UV light. The effect of the deposition conditions on the compositions and microstructures of the materials is discussed, and an integral study of the influence of the structural, morphological, optical and photoelectrochemical properties of the films on their catalytic activities for hydrogen production is presented through X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL) and electrochemical impedance spectroscopy (EIS) analyses. The LCVD process allows for the growth of films with attractive microstructures for photocatalytic applications, leading to a roof-like morphology in the case of orthorhombic NaTaO3 and a cauliflower-like morphology for cubic SrTiO3, which promote an enhanced charge separation and transference process and a higher photocatalytic efficiency compared to the photocatalysts prepared as powders. Orthorhombic NaTaO3 exhibits a hydrogen evolution rate of 5672 lmol g (1) h (1), and SrTiO3 generates only 494 lmol g (1) h (1), which are significantly higher than the activities of the materials prepared as powders. This improvement is attributed to the microstructure of the films prepared by LCVD and their superior optical, structural and photoelectrochemical properties. The results of the evaluation of the catalytic activity of the films prepared in thiswork by LCVD demonstrate the attainment of stable photocatalysts with a competitive performance compared to similar materials prepared by alternative methods. (C) 2017 Elsevier Ltd. All rights reserved.