Ag_(2)S Quantum Dots Decorated on Porous Cubic-CdS Nanosheets-assembled Flowers for Photocatalytic CO_(2)Reduction  

作　　者：Wei Fu Jiajie Fan Quanjun Xiang 

机构地区：[1]State Key Laboratory of Electronic Thin Film and Integrated Devices,School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China [2]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Chinese Journal of Structural Chemistry》2022年第6期39-47,共9页结构化学（英文）

基　　金：partially supported by the National Natural Science Foundation of China(No.51672099 and 52073263);the Open Foundation of State Key Laboratory of Electronic Thin Films and Integrated Devices(No.KFJJ202105);Fundamental Research Funds for the Central Universities(No.2017-QR-25)。

摘　　要：The production of renewable fossil fuels such as CH_(4) and CO by photocatalytic CO_(2)reduction has attracted more and more attention.However,single photocatalyst is less efficient for photocatalytic reduction of CO_(2)due to the fast recombination of photogenerated electron pairs.Herein,we successfully prepare CdS-Ag_(2)S composite by assembling the Ag_(2)S QDs cocatalyst on the surface of CdS nanosheet-assembled flower through oil-bath solvothermal method.This composite is prepared through a simple self-assembly strategy using cadmium chloride,ammonia and thiourea as precursors of the CdS nanosheet-assembled flower and silver nitrate and 3-mercaptopropionic acid as the precursors of Ag_(2)S QDs.The average diameter of Ag_(2)S QDs is apparently 6.0 nm.The light absorption edge of the composite is at around 560 nm,with the corresponding band gap at 2.14 eV.The CdS-Ag_(2)S QDs composite with 5 wt%Ag_(2)S QDs loaded achieves CO evolution rate of 16.6μmol·g^(-1)·h^(-1)without noble-metal cocatalysts.This strengthened photocatalytic performance and photocatalytic stability were attributed to the energy band broadening of Ag_(2)S QDs caused by quantum size effect and the large specific surface area due to the assembled flower.The mechanism underlying the enhanced photocatalytic CO_(2)reduction activity is further proposed.This study demonstrates that semiconductor-based quantum dots are strong candidates for excellent cocatalysts in photocatalysis.

关 键 词：CdS nanosheet Ag_(2)S quantum dots(QDs) assembled flower structure composite materials photocatalytic CO_(2)reduction 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X701[环境科学与工程—环境工程]