Enhanced Photocatalytic H_(2)-production Activity of CdS Nanoflower using Single Atom Pt and Graphene Quantum Dot as Dual Cocatalysts  

作　　者：Yi Yang Jinsong Wu Bei Cheng Liuyang Zhang Ahmed Abdullah Al-Ghamdi Swelm Wageh Youji Li 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Nanostructure Research Centre(NRC),Wuhan University of Technology,Wuhan 430070,China [2]Laboratory of Solar Fuel,Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China [3]Department of Physics,Faculty of Science,King Abdulaziz University,Jeddah 21589,Saudi Arabia [4]College of Chemistry and Chemical engineering,Jishou University,Jishou,Hunan 416000,China

出　　处：《Chinese Journal of Structural Chemistry》2022年第6期6-14,共9页结构化学（英文）

基　　金：supported by the National Key Research and Development Program of China(2018YFB1502001);National Natural Science Foundation of China(NSFC)(Nos.51872220,51961135303,51932007,U1905215,21871217 and 52073223);Deanship of Scientific Research(DSR)at King Abdulaziz University,Jeddah(No.RG-72-130-42)。

摘　　要：Single-atom catalysts have high catalytic activity due to their unique quantum size effects and optimal atom utilization.Herein,visi-ble-light-responsive photocatalysts were designed by coupling CdS with graphene quantum dots(GQDs)and platinum single atoms(PtSAs).GQDs and PtSAs were successively loaded on ultrathin CdS nanosheets through freeze-drying and in-situ photocatalytic reduction.The synergistic effect between PtSAs and GQDs results in superior photocatalytic activity with a hydrogen production rate of 13488μmol h^(-1)g^(-1)as well as the maximum apparent quantum efficiency(AQE)of 35.5%in lactic acid aqueous solution,which is 62 times higher than that of pristine CdS(213μmol g^(-1)h^(-1)).The energy conversion efficiency is ca.13.05%.As a photosensitizer and an electron reservoir,GQDs can not only extend the light response of CdS to the visible-light region(400-800 nm),but also promotes the separation of photoinduced electron-hole pairs.Meanwhile,PtSAs,with unique electronic and geometric features,can provide more efficient proton reduction sites.This finding provides an effective strategy to remarkably improve the photocatalytic H_(2) production performance.

关 键 词：hierarchical nanostructure single-atom catalysts graphene quantum dots CdS nanosheets hydrogen production 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]