TiO2/Co3O4复合纳米颗粒的制备及其光催化制氢性能

通过碳辅助法和溶胶-凝胶法制备了具有可见光下光催化制氢性能的TiO₂/Co₃O₄复合纳米颗粒。采用X射线衍射仪(XRD)、透射电子显微镜(TEM)和高分辨率透射电子显微镜(HRTEM), 以及紫外可见分光光度计表征了复合纳米颗粒的晶体结构、微观形貌和紫外-可见光谱吸收能力。结果表明, 制备的复合纳米颗粒具有良好的晶型、结构以及紫外可见光吸收能力。实验测试了TiO₂/Co₃O₄复合纳米颗粒在模拟太阳光下的光催化制氢性能, 并研究了其光催化制氢的可重复利用性。结果表明, 在模拟太阳光照射下, 该复合纳米颗粒催化纯水产生氢气的速率约为8.25 μmol/(g·h), 且该复合纳米颗粒具有良好的可重复利用性。

Preparation and Characterization of TiO2/Co3O4 Nanocomposites and Their Photocatalytic Activity for Hydrogen Evolution

TiO₂/Co₃O₄ nanocomposites with photocatalytic activity for hydrogen evolution under visible light were prepared via carbon assistant method and Sol-Gel method. X-Ray Diffraction (XRD), Transmission Electron Microscope(TEM), High Resolution Transmission Electron Microscope(HRTEM) and UV-Vis spectrophotometer were used to characterize the samples’ crystal structure, morphology and absorptivity of ultraviolet and visible light. The characterization results demonstrate that the prepared nanocomposites have good crystal form, structure and absorptivity of both ultraviolet and visible light. The photocatalytic activity of TiO₂/Co₃O₄ nanocomposites for hydrogen evolution under simulated sunlight was tested and their reusability was also investigated. The results show that the photocatalytic hydrogen evolution of pure water over the TiO₂/Co₃O₄ nanocomposites is about 8.25 μmol/(g·h) under simulated sunlight. And the nanocomposites possess ideal reusability.