物理化学学报2017，Vol.33Issue(3)：590-601,12.DOI:10.3866/PKU.WHXB201611241
水热法制备p-CoFe2O4/n-CdS及其光催化制氢性能
Preparation of p-CoFe2O4/n-CdS by Hydrothermal Method and Its Photocatalytic Hydrogen Production Activity
摘要
Abstract
A series of p-n coupled p-CoFe2O4/n-CdS photocatalysts were prepared by a hydrotherrnal method.The structure and properties of p-CoFe2O4/n-CdS were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS),transmission electron microscopy (TEM) and the electrochemical workstation.The photocatalytic activities of p-CoFe2O4/nCdS were evaluated by photocatalytic hydrogen production under visible light irradiation.The effects of photocorrosion of CdS in p-CoFe2O4/n-CdS were investigated by analyzing the cadmium concentration of the supernatant collected after the photocatalytic reactions.The mechanism of the catalytic activity enhancement,effects of reaction conditions on the photocatalytic hydrogen evolution rate,and cadmium leakage resistance are discussed.The results show that p-CoFe2O4/n-CdS exhibits higher photocatalytic activity attributed to stronger light absorption by the two types of narrow band gap semiconductor CoFe2O4 and CdS,the formation of a "forest-like" structure of CdS and rapid electron transfer from CoFe2O4 to CdS,resulting from band ovedap and an inner electric field in p-CoFe2O4/n-CdS,to reduce the probability of electron/hole pair recombination.Both the separation efficiency of photo-generated electron-hole pairs and the adsorption performance of photocatalysts had an important influence on the hydrogen production rate.The pH of the CH3OH aqueous solution influenced the separation efficiency of photogenerated electron-hole pairs and the adsorption properties of the photocatalyst.p-CoFe2O4/n-CdS also exhibited resistance against cadmium leakage under light irradiation owing to the presence of methanol in the reaction solution,the band overlap of the semiconductors and the inner electric field in p-CoFe2O4/n-CdS.The band overlap and inner electric field had the most influence on the cadmium leakage resistance.关键词
CoFe2O4/CdS/光催化/制氢/光腐蚀Key words
CoFe2O4/CdS/Photocatalysis/Hydrogen production/Photocorrosion分类
化学化工引用本文复制引用
胡海龙,王晟,侯美顺,刘福生,王田珍,李天龙,董乾乾,张鑫..水热法制备p-CoFe2O4/n-CdS及其光催化制氢性能[J].物理化学学报,2017,33(3):590-601,12.基金项目
The project was supported by the National Natural Science Foundation of China (50876047),Top-notch Academic Programs Project of Jiangsu Higher Education Institutions,China (TAPP,PPZY2015A044) and Scientific Research Innovation Program of Graduate in Colleges and Universities of Jiangsu Province,China (SJLX15-0346).国家自然科学基金(50876047),江苏高校品牌专业建设工程项目(TAPP,PPZY2015A044)和江苏省普通高校研究生科研创新计划项目(SJLX15-0346)资助 （50876047）
