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光电极与电解液界面之间的电子转移缓慢，为了改善Bi2S3/MIL-125光电极的界面电荷转移动力学性能，利用热还原法引入Ag NPs对Bi2S3/MIL-125光电极进行修饰，制备出的Ag-Bi2S3/MIL-125光电极加快了界面间的电子转移。在-0.5~-0.8 V(versus Ag/AgCl)，Bi2S3/MIL-125(Ti)0.07的最大饱和光电流(-0.90 mA·cm-2)是未修饰的Bi2S3(-0.61 mA·cm-2)的1.5倍；Ag-Bi2S3/MIL-125(Ti)0.07的最大饱和光电流(-1.87 mA·cm-2)是未修饰的Bi2S3(-0.61 mA·cm-2)的3.1倍。

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).