具有n-n型异质结的复合材料Bi_(2)S_(3)/MIL-125(Ti)光电性能研究  

Photoelectric Properties of Bi_(2)S_(3)/MIL-125(Ti) Composites with n-n Heterostructure

作　　者：兰博洋 祁婉欣 李东[1,2] 韩凤兰 LAN Boyang;QI Wanxin;LI Dong;HAN Fenglan(School of Material Science and Engineering,North Minzu University,Yinchuan 750021,China;International Scientific&Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials,Yinchuan 750021,China)

机构地区：[1]北方民族大学材料科学与工程学院,银川750021 [2]工业废弃物循环利用及先进材料“国际合作基地”,银川750021

出　　处：《人工晶体学报》2023年第1期139-148,共10页Journal of Synthetic Crystals

基　　金：宁夏自然科学基金(2021AAC03170);北方民族大学研究生创新项目(YCX22147);宁夏自治区重点研发项目(2021BEG01003)。

摘　　要：以硫代硫酸钠·五水合物(Na_(2)S_(2)O_(3)·5H_(2)O)、硝酸铋·五水合物(BiN_(3)O_(9)·5H_(2)O)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(Bi_(2)S_(3)),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,Bi_(2)S_(3)/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Bi_(2)S_(3)/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Bi_(2)S_(3)/MIL-125光电极与电解液界面之间的电子转移缓慢,为了改善Bi_(2)S_(3)/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Bi_(2)S_(3)/MIL-125光电极进行修饰,制备出的Ag-Bi_(2)S_(3)/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),Bi_(2)S_(3)/MIL-125(Ti)_(0.07)的最大饱和光电流(-0.90 mA·cm^(-2))是未修饰的Bi_(2)S_(3)(-0.61 mA·cm^(-2))的1.5倍;Ag-Bi_(2)S_(3)/MIL-125(Ti)_(0.07)的最大饱和光电流(-1.87 mA·cm^(-2))是未修饰的Bi_(2)S_(3)(-0.61 mA·cm^(-2))的3.1倍。Using sodium thiosulfate pentahydrate(Na_(2)S_(2)O_(3)·5H_(2)O),bismuth nitrate pentahydrate(BiN_(3)O_(9)·5H_(2)O)as sulfur source and bismuth source,and urea(CON2H4)as structure guide agent,bismuth sulfide(Bi_(2)S_(3))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),Bi_(2)S_(3)/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 Bi_(2)S_(3)/MIL-125 composite,which significantly improves the absorption capacity of ultraviolet light and visible light.However,due to the slow electron transfer between Bi_(2)S_(3)/MIL-125 photoelectrode and electrolyte interface,in order to improve the interface charge transfer kinetic performance of Bi_(2)S_(3)/MIL-125 photoelectrode,Ag NPs was introduced by thermal reduction method to modify the Bi_(2)S_(3)/MIL-125 photoelectrode.The Ag-Bi_(2)S_(3)/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 Bi_(2)S_(3)/MIL-125(Ti)_(0.07)(-0.90 mA·cm^(-2))is about 1.5 times of unmodified Bi_(2)S_(3)(-0.61 mA·cm^(-2)),and maximum saturation photocurrent of Ag-Bi_(2)S_(3)/MIL-125(Ti)_(0.07)(-1.87 mA·cm^(-2))is about 3.1 times of unmodified Bi_(2)S_(3)(-0.61 mA·cm^(-2)).

关 键 词：MIL-125(Ti) Bi_(2)S_(3)纳米棒 溶剂热法 异质结 光电性能 光电极 

分 类 号：TB332[一般工业技术—材料科学与工程]