Z型Ag-Cu2O/BiVO4光催化剂的光催化还原CO2性能
Photocatalytic CO2 reduction performance of Z-scheme Ag-Cu2O/BiVO4 photocatalyst
杨懿 1王爽 1王文丹 1陈立妙1
作者信息
- 1. 中南大学化学化工学院,长沙 410083
- 折叠
摘要
利用简单的化学还原沉积法将Cu2O纳米球和Ag纳米颗粒均匀包裹在十面体BiVO4表面,成功构建了一种具有高效电荷载流子分离/转移特性的Z型异质结光催化剂Ag-Cu2O/BiVO4.Ag-Cu2O/BiVO4在可见光下光催化CO2还原为CO的产率可达5.37μmol·g-1·h-1,分别是纯BiVO4和Cu2O的35.8倍和6.25倍.通过X射线粉末衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、X射线能谱(EDS)、紫外可见漫反射光谱(UV-Vis DRS)、光致发光(PL)光谱、瞬态光电流响应(TPC)和电化学阻抗谱(EIS)对Ag-Cu2O/BiVO4的晶体结构、形貌、组成、能带结构和吸光能力等进行了系统表征分析,并提出了其光催化体系还原C02的催化机理.
Abstract
A Z-scheme heterojunction photocatalyst Ag-Cu2O/BiVO4 was successfully constructed with effective charge carrier separation/transfer by uniformly encapsulating Cu2O nanospheres and Ag nanoparticles on the sur-face of decahedral BiVO4 using a simple chemical reduction deposition strategy.The photo-reduction of carbon diox-ide reaction result indicated that the as-prepared Ag-Cu2O/BiVO4 heterostructure exhibited excellent activity of photo-reduction CO2 with the CO yield of 5.37 μmol·g-1·h-1,about 35.8 times and 6.25 times of original BiVO4 and Cu2O,respectively.Ag-Cu2O/BiVO4 was characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),UV-Vis diffuse reflec-tance absorption spectra(UV-Vis DRS),photoluminescence(PL)spectra,transient photocurrent responses(TPC),and electrochemical impedance spectroscopy(EIS),and the possible reaction mechanism for the reduction of CO2 in the photocatalytic system was proposed.
关键词
Ag-Cu2O/BiVO4/Z型异质结/光催化CO2还原/可见光照射Key words
Ag-Cu2O/BiVO4/Z-scheme heterojunction/photocatalytic CO2 reduction/visible light irradiation引用本文复制引用
基金项目
国家自然科学基金(21776317)
湖南省自然科学基金(2021JJ30787)
中南大学中央高校基本科研业务费专项资金(1053320210679)
出版年
2024
NETL
NSTL
万方数据