具有n-n型异质结的复合材料Bi2S3/MIL-125(Ti)光电性能研究

以硫代硫酸钠·五水合物(Na₂S₂O₃·5H₂O)、硝酸铋·五水合物(BiN₃O₉·5H₂O)为硫源和铋源，尿素(CON₂H₄)为结构导向剂，制备了纳米棒状结构的硫化铋(Bi₂S₃),使其原位生长在MIL-125(Ti)的笼状结构表面。PEC性能测试显示，在0.5 mol·L^-1的硫酸钠电解液(pH=6.0)中，Bi₂S₃/MIL-125(Ti)_0.07(MIL-125(Ti)加入量为0.07 g)的复合材料表现出最高的光电性能。光电性能的显著增强主要取决于Bi₂S₃/MIL-125复合材料的带隙重整效应，对紫外光以及可见光的吸收能力显著提高。但由于Bi₂S₃/MIL-125...

Photoelectric Properties of Bi2S3/MIL-125(Ti) Composites with n-n Heterostructure

Using sodium thiosulfate pentahydrate (Na₂S₂O₃·5H₂O), bismuth nitrate pentahydrate (BiN₃O₉·5H₂O) as sulfur source and bismuth source, and urea (CON₂H₄) as structure guide agent, bismuth sulfide (Bi₂S₃) with nanorod structure was prepared. It was grown in situ on the cage-like surface of MIL-125(Ti). PEC performance test shows that in 0.5 mol·L^-1 sodium sulfate electrolyte (pH=6.0), Bi₂S₃/MIL-125(Ti)_0.07(the addition amount of MIL-125(Ti) is 0.07 g) composite has the highest photoelectric property. The significant enhancement of photoelectric property mainly depends on the bandgap reforming effect of Bi₂S₃/MIL-125 composite, which significantly improves the absorption capacity of ultraviolet light and visible light. However, due to the slow electron transfer between Bi₂S₃/MIL-125 photoelectrode and electrolyte interface, in order to improve the interface charge transfer kinetic performance of Bi₂S₃/MIL-125 photoelectrode, Ag NPs was introduced by thermal reduction method to modify the Bi₂S₃/MIL-125 photoelectrode. The Ag-Bi₂S₃/MIL-125 photoelectrode was prepared to accelerate the electron transfer between interfaces. In the range from -0.5 V to -0.8 V (versus Ag/AgCl), maximum saturation photocurrent of Bi₂S₃/MIL-125(Ti)_0.07 (-0.90 mA·cm^-2) is about 1.5 times of unmodified Bi₂S₃(-0.61 mA·cm^-2), and maximum saturation photocurrent of Ag-Bi₂S₃/MIL-125(Ti)_0.07 (-1.87 mA·cm^-2) is about 3.1 times of unmodified Bi₂S₃ (-0.61 mA·cm^-2).