title: Perfect inhibition of CdS photocorrosion by graphene sheltering engineering on TiO2 nanotube array for highly stable photocatalytic activity.
abstract: An artful graphene sheltering engineering onto TiO2 nanotube array for perfect inhibition of CdS photocorrosion (RGO/CdS-TiO2 NT) has been developed by a one-step electrodeposition method. The CdS photocorrosion driven by both holes and radicals has been systematically investigated and identified. The RGO layer provides a perfect protection to CdS through (i) blocking the attack of active species especially ˙OH radicals and (ii) offering a closed electron-rich microenvironment where the stored electrons RGO(e(-)) not only reduce intermediate species S˙(-) to S(2-) but also compensate the valence band of CdS for its loss of electrons to alleviate CdS photocorrosion from oxidation by holes. The photocatalyst exhibits extremely high stability. RGO/CdS-TiO2 NT shows high visible-light photocatalytic activity for the degradations of organic dye methylene blue (MB), industrial chemical p-nitrophenol (PNP) and herbicide 2,4-dichlorophenoxyacetic acid (2,4-D). This work provides a new insight into the protection of photosensitive semiconductors from photocorrosion.
authors.affiliation: College of Materials Science and Engineering, Hunan University, Changsha 410082, P. R. China. tangyh@hnu.edu.cn.
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Tang
authors.forename: Xu
authors.initials: X
authors.lastname: Hu
authors.forename: Chengbin
authors.initials: C
authors.lastname: Liu