0D-2D CdS/WO_(3) S型异质结光催化剂的制备与性能研究

Preparation and properties of 0D-2D CdS/WO_(3) S-Scheme heterojunction

光生载流子的迁移效率是影响CO_(2)光还原反应性能的关键因素之一.通过简单的水热法与连续离子层吸附反应成功制备了具有高效载流子迁移能力的0D-2D S型CdS/WO_(3)光催化复合材料.XRD、SEM、XPS分析结果证实了该复合材料的成功制备,其独特的OD-2D结构有效提高了CdS QDs的分散性.UV-Vis DRS结果表明该材料具有优异的光吸收能力.光电化学表征证明CdS/WO_(3)复合材料具有最佳的光电转化能力以及光生载流子迁移能力,有助于其光还原反应的进行.光还原CO_(2)实验表明该复合材料具有远高于CdS QDs材料的光催化活性,其CO和CH 4的产率为64.7μmol/(g·h)和2.3μmol/(g·h),分别是纯CdS QDs的4.0倍和3.2倍,循环实验表明CdS/WO_(3)具有良好的催化稳定性.

The transport efficiency of photogenerated carriers is the key to the CO_(2) photoreduction reaction.In this paper,a 0D-2D S-Scheme CdS/WO_(3) photocatalytic composite with high carrier migration ability has been successfully prepared by a simple hydrothermal process and successive ionic layer adsorption and reaction.XRD,SEM and XPS analysis results confirm the successful preparation of the CdS/WO_(3) composite catalyst,and its unique OD-2D structure effectively improves the dispersion of CdS QDs.The results of UV-Vis DRS show that the material has the excellent visible light absorption range.The photoelectrochemical characterizations prove that CdS/WO_(3) composite has the best photoconversion ability and photogenerated carriers migration ability,which is conducive to the CO_(2) photoreduction reaction.The photocatalytic activity of the CdS/WO_(3) is much higher than that of CdS QDs.The CO and CH 4 yields of the composite are 64.7μmol/(g·h)and 2.3μmol/(g·h),which are about 4.0 and 3.2 times higher than that of pure CdS QDs,respectively.The cyclic experiments show that CdS/WO_(3) has good catalytic stability.