Rational design of Cd0.8Zn0.2S/carbon quantum dots composite photocatalytic material for efficient hydrogen evolution
HE Jingyi
ZHANG Wensen
LIU Zengguang
WANG Zemeng
LU kangqiang
YANG Kai
Abstract：Cd0.8Zn0.2S solid solutions possess the advantages of good optical absorption and easy prepara-tion.However,the photogenerated carriers of Cd0.8Zn0.2S are easy to recombine,resulting in the poor photocatalytic performance.Carbon quantum dots(CQD),the star of the carbon family,is considered as a promising cocatalyst.It is expected to synthesize high-performance photocatalyst for photocatalytic water splitting by combining Cd0.8Zn0.2S with carbon quantum dots.In this work,Cd0.8Zn0.2S/CQD com-posite photocatalyst with different proportions of CQD has been synthesized by one-step hydrothermal method.Photocatalytic hydrogen production activity test indicates the H2 generation activity of Cd0.8Zn0.2S/30％CQD is 995 μmol·g-1·h-1,which is 37.4％ higher than that of pure Cd0.8Zn0.2S. In addition,the cyclic stability test indicates relatively well photocatalytic stability of the composite.Electro-chemical tests indicate that the introduction of CQD can effectively promote the separation and migration of photogenerated carriers,which is due to the fact that CQD acts as an electron reservoir to efficiently capture the electrons generated by Cd0.8Zn0.2S and hinder the electron-hole pair recombination.As a cocat-alyst,CQD improves the photocatalytic performance and stability of Cd0.8Zn0.2S.This study could provide useful references for the construction of high-performance composite photocatalysts.
Keywords：Cd0.8Zn0.2Scarbon quantum dotsphotocatalytic H2 productionvisible light
Publication Date：2025-06-25
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：9( 421-429 )