Construction of ZnCoP/CdLa2S4 Schottky Heterojunctions for Enhancing Photocatalytic Hydrogen Evolution
Photocatalytic hydrogen evolution by heterojunction photocatalysts is considered an effective way to address environmental and energy crises.In this work,a novel ZnCoP/CdLa2S4 Schottky heterojunction was prepared via a physical mixing method assisted by water bath heating and used to enhance the efficiency of photocatalytic hydrogen production.Owing to the higher work function and metallic conductivity of ZnCoP,the photoinduced electrons can transfer from CdLa2S4 to ZnCoP through the ZnCoP/CdLa2S4 interface,which suppresses the recombination of photoinduced electrons and holes.Moreover,the Schottky heterojunction formed at the interface between ZnCoP and CdLa2S4 inhibits electron backflow from ZnCoP to CdLa2S4,which further promotes the separation of electron-hole pairs.Meanwhile,the ZnCoP/CdLa2S4 heterojunction exhibited enhanced visible light absorption compared to CdLa2S4.In addition,ZnCoP acts as an electron acceptor and hydrogen evolution active site.The synergistic effect of the tight ZnCoP/CdLa2S4 interface,the higher work function and metallic conductivity of ZnCoP,and the formation of Schottky junctions significantly enhance the photocatalytic hydrogen production evolution performance of CdLa2S4.When the amount of ZnCoP was 30 wt%(wt%,mass fraction),the 30ZCP/CLS composite showed the highest photocatalytic performance,and the hydrogen production rate reached 10.26 mmol·g-1·h-1 under visible light irradiation and with Na2S and Na2SO3 as sacrificial agents,which was 7.7 times that of CdLa2S4.Combined with the activity data and characterization results,a potential mechanism for photocatalytic hydrogen production over ZnCoP/CdLa2S4 Schottky heterojunctions was proposed.
CdLa2S4ZnCoPSchottky heterojunctionPhotocatalyticCharge transfer
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