Self-template synthesis of double-layered porous nanotubes with spatially separated photoredox surfaces for efficient photocatalytic hydrogen production  

作　　者：Yani Xin Yi Huang Kui Lin Yifu Yu Bin Zhang 

机构地区：[1]Department of Chemistry, School of Science, and Tianfin Key Laboratory of Molecular Optoelectronic Science, tianjin University, and Collaborative innovation Center of Chemical Science and Engineering (Tianjin), tianjin 300072,China [2]Analysis Center,School of Materials Science and Engineering,Tianjin University, Tianjin 300072,China

出　　处：《Science Bulletin》2018年第10期601-608,共8页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21422104);the Natural Science Foundation of Tianjin City(17JCJQJC44700 and 16JCZDJC30600)

摘　　要：Improving charge carriers separation to achieve high photoconversion efficiency in heterogeneous photocatalysts is highly desirable.Herein,heterostructured ZnS@CdS double-layered porous nanotubes(PNTs),in which the spatially separated reduction and oxidation reaction sites lie on the outer and inner shell,respectively,are fabricated through a robust self-template conversion strategy.After selective photo-deposition of Ni and CoO_x as dual cocatalysts,Ni nanoparticles as electron collectors and reduction reaction sites are loaded on the outer shell,while CoO_x nanoparticles as hole collectors and oxidation reaction sites are loaded on the inner shells.As a result,a novel CoO_x/ZnS@CdS/Ni photocatalyst is obtained and shows high visible-light-driven photocatalytic hydrogen production activity owing to the synergistic effect of self-template-derived thin mesoporous heterojunctions and photo-depositionderived spatially separated dual cocatalysts,which can significantly provide driving force for the ordered transfer of photogenerated electrons and holes toward opposite direction and promote the surface catalytic reaction.Additionally,the facile strategy can be broadened to the preparation of CoO_x/ZnSe@CdSe/NiPNTs with enhanced photocatalytic activity.Improving charge carriers separation to achieve high photoconversion efficiency in heterogeneous photocatalysts is highly desirable.Herein,heterostructured ZnS@CdS double-layered porous nanotubes（PNTs）,in which the spatially separated reduction and oxidation reaction sites lie on the outer and inner shell,respectively,are fabricated through a robust self-template conversion strategy.After selective photo-deposition of Ni and CoOx as dual cocatalysts,Ni nanoparticles as electron collectors and reduction reaction sites are loaded on the outer shell,while CoOx nanoparticles as hole collectors and oxidation reaction sites are loaded on the inner shells.As a result,a novel CoOx/ZnS@CdS/Ni photocatalyst is obtained and shows high visible-light-driven photocatalytic hydrogen production activity owing to the synergistic effect of self-template-derived thin mesoporous heterojunctions and photo-depositionderived spatially separated dual cocatalysts,which can significantly provide driving force for the ordered transfer of photogenerated electrons and holes toward opposite direction and promote the surface catalytic reaction.Additionally,the facile strategy can be broadened to the preparation of CoOx/ZnSe@CdSe/NiPNTs with enhanced photocatalytic activity.

关 键 词：Self-template Mesoporous nanotubes Spatial separation Photocatalysis Hydrogen evolution 

分 类 号：O643.36[理学—物理化学] TB383[理学—化学]