Rational design of ZnCdS/TpPa-1-COF heterostructure photocatalyst by strengthening the interface connection in solar hydrogen production reactions  

作　　者：Di Yang Zhi-Gang Li Xinghao Zhang Zenghuan Ren Weihan Lu Haining Liu Xiaomeng Guo Jijie Zhang Xian-He Bu 

机构地区：[1]Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry,School of Materials Science and Engineering,Nankai University,Tianjin 300350,China [2]College of Chemistry and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China [3]State Key Laboratory of Elemento-Organic Chemistry,College of Chemistry,Nankai University,Tianjin 300071,China

出　　处：《Nano Research》2024年第3期1027-1034,共8页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21908113);the Tianjin Applied Basic Research Project(No.21JCYBJC00140);Science and Technology Project of Hebei Education Department(No.QN2023114).

摘　　要：ZnCdS quantum dots(QDs)are highly coveted in photocatalysis research for their exceptional visible-light responses and high light-absorption coefficients.However,their practical application is hindered by their tendency to aggregate,due to having high surface energies.To address this issue,herein,a heterostructure is synthesized by growing ZnCdS QDs with a size of approximately 5 nm onto the surface of a two-dimensional(2D)covalent organic framework(COF),TpPa-1-COF.This approach suppresses the aggregation of the QDs and improves their stability.The ZnCdS/TpPa-1-COF composite exhibited a peak hydrogen evolution rate of 6244.16μmol·g^(-1)·h^(-1),which was 2.89 and 4.18 times greater than that of ZnCdS and TpPa-1-COF,respectively.The zero-dimensional/two-dimensional(0D/2D)heterojunction formed by ZnCdS and TpPa-1-COF generates a strong interfacial force,which is attributed to the intimate contact between the interfaces.Tight connections accelerate charge separation,improve the utilisation of reduced electrons,and reduce the extent of agglomeration of the ZnCdS QDs,thereby resulting in high hydrogen production activity of the composites.Meanwhile,the photocatalytic mechanism is studied using Kelvin probe force microscopy and theoretical calculations.This study offers a novel approach for creating sulfide photocatalysts and is crucial for investigating the potential practical applications of the related photocatalysts.

关 键 词：covalent organic frameworks quantum dots photocatalysis hydrogen generation HETEROJUNCTION 

分 类 号：O47[理学—半导体物理]