Polydopamine nanolayer assisted internal photo-deposition of CdS nanocrystals for stable cosensitized photoanode  

作　　者：Na Li Lu Han Hainan Zhang Juntong Huang Xudong Luo Xibao Li Yuanhao Wang Weiqi Qian Ya Yang 

机构地区：[1]School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China [2]School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China [3]SUSTech Engineering Innovation Center,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China [4]CAS Center for Excellence in Nanoscience,Beijing Key Laboratory of Micro-nano Energy and Sensor,Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,Beijing 101400,China

出　　处：《Nano Research》2022年第10期8836-8845,共10页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(U1908227,52072041,and 51962023);the Beijing Natural Science Foundation(No.JQ21007);the University of Chinese Academy of Sciences(No.Y8540XX2D2).

摘　　要：Hydrogen evolution via photo-electro-chemical(PEC)co-catalysis is potential for solving energy crisis and environmental issues.The rapidly advances of fabrication and broad applications of polydopamine(PDA)and its derivatives have drawn intense attentions in recent years.Herein,an ultrathin PDA coating with nanometer accuracy was conformally grown on TiO_(2) nanotube arrays(NTAs)via electrochemical polymerization,in which the polymer provided a platform for further photoinduced assembly of CdS nanocrystals in the embedded mode.The optimized CdS@PDA/TiO_(2) NTAs hierarchical heterostructure as photoanode gave an excellent PEC performance and exhibited outstanding stability under light irradiation.The photocurrent density was heightened to 5.48 mA·cm^(–2),which was beneficial to H_(2) evolution with a rate of 20μmol·h^(–1)·cm^(–2).The improvement of PEC activity was ascribed to co-photosensitization,optimized carriers transfer,and transport route arised from CdS embedding,resulting to provide a persistent driving force for charge separation based on secure heterojunction of CdS/TiO_(2) glued by PDA.The improvement of PEC stability was due to the inhibition of CdS photocorrosion covered by PDA shelter.This advance boded well for the development of PEC field founded on multifunctional PDA.

关 键 词：POLYDOPAMINE TiO_(2)nanotube arrays photoelectrocatalysis photocorrosion 

分 类 号：TB383[一般工业技术—材料科学与工程]