Z型 g-C3N4/Pt/TiO2纳米管阵列复合电极的制备及光电氧化甲醇性能

以NH₄Cl为气体模板吹制双氰胺制备g-C₃N₄纳米片, 并将其负载于Pt/TiO₂纳米管阵列(Pt/TiO₂ NTs)上, 制备了一种新型的Z型g-C₃N₄/Pt/TiO₂NTs复合电极材料. 通过扫描电子显微镜、 X射线衍射和X射线光电子能谱对该材料的结构进行了表征, 采用电化学和光电化学方法研究了材料的性能. 研究结果显示, 在可见光照射下, g-C₃N₄/Pt/TiO₂ NTs复合材料具有高效的光电氧化甲醇的性能. 该复合材料的高性能主要归因于以下两点： (1) g-C₃N₄与Pt/TiO₂NTs的结合有效扩展了其在可见光范围的吸收; (2) Z型电荷转移保留了具有强氧化能力的空穴和强还原能力的电子, 从而使光生中间体作用于电催化过程增强了甲醇氧化效率.

Preparation of Z-type g-C3N4/Pt/TiO2 Nanotube Array Composite Electrode and Its Performance of Photoelectric Oxidation of Methanol

g-C₃N₄ nanosheets were prepared by blowing dicyandiamide with NH₄Cl as a gas template， and then loaded on Pt/TiO₂ nanotube arrays（Pt/TiO₂ NTs） to prepare a new type of Z-type g-C₃N₄/Pt/TiO₂ NTs composite electrode. The structure of the material was characterized by means of scanning electron microscopy， X-ray diffraction spectrometer， and X-ray photoelectron spectroscopy. Electrochemical and photoelectrochemical methods were used to inspect the characteristics of the materials. The results show that the g-C₃N₄/Pt/TiO₂ NTs composite has an efficient performance of photoelectric oxidation of methanol under visible light irradiation. There are two main reasons for the high performance of g-C₃N₄/Pt/TiO₂ NTs composite： （1） the combination of g-C₃N₄ and Pt/TiO₂ NTs effectively expands the absorption in the visible light range； （2） Z-type charge transfer retains strong oxidation ability of holes and strong reduction of electrons， so that the photo-generated interme-diate acts on the electrocatalytic process and enhances the efficiency of methanol oxidation.