Z型g-C_(3)N_(4)/Pt/TiO_(2)纳米管阵列复合电极的制备及光电氧化甲醇性能

Preparation of Z-type g-C_(3)N_(4)/Pt/TiO_(2) Nanotube Array Composite Electrode and Its Performance of Photoelectric Oxidation of Methanol

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.

g-C_(3)N_(4)nanosheets were prepared by blowing dicyandiamide with NH4Cl as a gas template,and then loaded on Pt/TiO_(2)nanotube arrays(Pt/TiO_(2)NTs)to prepare a new type of Z-type g-C_(3)N_(4)/Pt/TiO_(2)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-C_(3)N_(4)/Pt/TiO_(2)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-C_(3)N_(4)/Pt/TiO_(2)NTs composite:(1)the combination of g-C_(3)N_(4)and Pt/TiO_(2)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.