物理化学学报2017，Vol.33Issue(3)：554-562,9.DOI:10.3866/PKU.WHXB201611171
氧化石墨烯在氧化锌衬底上的电化学还原及其光电性能
Electrochemical Reduction of Graphene Oxide on ZnO Substrate and Its Photoelectric Properties
摘要
Abstract
Abstrct:In the present work,graphene oxide (GO)-ZnO bilayer composites were fabricated by depositing GO on ZnO by an anodic electrophoretic method.The composite films were then subjected to a cathodic electrochemical treatment with different GO reduction times.The as-prepared films were characterized by Xray photoelectron spectroscopy (XPS),Fourier transform infrared (FTIR) spectroscopy and field emission scanning electron microscopy (FESEM) to study changes in the GO structure.The evolution of the material's energy levels over time was also determined by ultraviolet-visible (UV-Vis) spectroscopy and electrochemical measurements.A series of structural transformations of GO occurred even after it had reached the maximum degree of reduction.Prolonged treatment saw the GO flakes fracture into smaller GO particles with a sharp increase in the proportion of carboxyl groups.The energy gap of GO varied and extended into the visible range with longer reduction time.The energy levels and charge carrier type also varied.Photoelectrochemical tests on the samples revealed that the 60 to 600-s reduced GO-ZnO composite films showed photoelectric conversion behavior as photoanodes.However,the sample reduced for 1800 s was not effective at light-harvesting owing to lowering of the GO conduction band below that of ZnO.The differences in performance indicated that the transformation of the laminated GO geometry to a more disordered distribution enhanced conversion efficiency.关键词
氧化石墨烯-氧化锌复合膜/电化学还原/结构转变/能级演变/光电转换Key words
Graphene oxide-ZnO composite film/Electrochemical reduction/Structural transformation/Energy level evolution/Photoelectric conversion分类
化学化工引用本文复制引用
李一鸣,陈肖,刘晓军,李文有,贺蕴秋..氧化石墨烯在氧化锌衬底上的电化学还原及其光电性能[J].物理化学学报,2017,33(3):554-562,9.基金项目
The project was supported by the National Natural Science Foundation of China (51172162).国家自然科学基金(51172162)资助项目 （51172162）
