College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, PR China.
Dalton Trans. 2013 Sep 14;42(34):12284-92. doi: 10.1039/c3dt51498f. Epub 2013 Jul 12.
Freely-assembled ternary hybrids consisting of Pt, reduced graphene oxide (RGO) and P25 were synthesized by a direct solution process with the assistance of UV light. The Pt-RGO/P25 hybrids were characterized by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet visible (UV-vis) diffuse reflectance spectroscopy (DRS) and photoluminescence spectra (PL). Importantly, when Pt-RGO/P25 hybrids were used as photocatalysts, they could show a superior photocatalytic performance when compared to commercial P25 and RGO/P25 hybrids under UV, solar light and λ > 600 nm visible light irradiation, which could be explained on the basis of the plasmonic response and the formation of Pt Schottky barrier at the interface between TiO2 and graphene. This work could provide new insight for enhancing graphene/TiO2 photocatalytic performance and facilitate their application in environmental protection.
通过直接溶液法并辅以紫外光照射，成功制备了由 Pt、还原氧化石墨烯（RGO）和 P25 组成的三元自由组装杂化物。Pt-RGO/P25 杂化物通过拉曼光谱、X 射线光电子能谱（XPS）、X 射线衍射（XRD）、场发射扫描电子显微镜（SEM）、透射电子显微镜（TEM）、紫外可见漫反射光谱（UV-vis DRS）和光致发光光谱（PL）进行了表征。重要的是，当 Pt-RGO/P25 杂化物用作光催化剂时，与商业 P25 和 RGO/P25 杂化物相比，它们在紫外光、太阳光和 λ>600nm 可见光照射下表现出优异的光催化性能，这可以基于等离子体响应和在 TiO2 和石墨烯之间的界面形成 Pt 肖特基势垒来解释。这项工作可以为增强石墨烯/TiO2 光催化性能提供新的见解，并促进其在环境保护中的应用。
