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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Ultraviolet-assisted preparation of mesoporous WO3/ reduced graphene oxide composites: superior interfacial contacts and enhanced photocatalysis
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Ultraviolet-assisted preparation of mesoporous WO3/ reduced graphene oxide composites: superior interfacial contacts and enhanced photocatalysis

机译：紫外线辅助制备介孔WO3 /还原型氧化石墨烯复合材料：优异的界面接触和增强的光催化作用

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摘要

In this paper, we report the synthesis, characterization, and photocatalysis of a novel composite, composed of high-ordered mesoporous WO3 (m-WO3) and reduced graphene oxide (RGO). The composite was systematically characterized by X-ray diffraction, transmission electron microscopy, Raman spectroscopy, Fourier transform Infrared spectroscopy, N2 adsorption-desorption and UV-visible diffuse reflectance spectroscopy techniques. The superior contact between two moieties in the composites facilitates the charge carrier separation and the evolution of oxygen. Under visible light irradiation, the amount of oxygen evolution from the optimized photocatalyst containing ca. 6 wt% RGO reached 437.3 nmol g^ which was 5.1 times as high as that from m-WO3. The enhancement of photocatalytic activity could be ascribed to the fact that RGO acts herein as a solid-state electron mediator, promoting the charge transportation and separation, as well as suppressing the electron-hole recombination in the composite. This study might provide a prototype for constructing a novel photocatalytic system by hybridizing graphene with a mesoporous semiconductor for solar energy conversion.
机译：在本文中，我们报告了一种新型复合材料的合成，表征和光催化作用，该复合材料由高阶介孔WO3（m-WO3）和还原氧化石墨烯（RGO）组成。通过X射线衍射，透射电子显微镜，拉曼光谱，傅立叶变换红外光谱，N2吸附-解吸和紫外可见漫反射光谱技术对复合材料进行了系统表征。复合物中两个部分之间的良好接触促进了电荷载流子的分离和氧的释放。在可见光照射下，氧气从最优化的光催化剂中逸出的量约为6wt％的RGO达到437.3nmol g / g，是来自m-WO 3的5.1倍。光催化活性的增强可归因于以下事实：RGO在本文中充当固态电子介体，促进电荷的运输和分离，以及抑制复合物中的电子-空穴复合。这项研究可能为通过将石墨烯与介孔半导体杂交以构建太阳能转化提供一种新型光催化体系的原型。

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