Liquid exfoliating CdS and MoS_(2) to construct 2D/2D MoS_(2)/CdS heterojunctions with significantly boosted photocatalytic H2 evolution activity  

作　　者：Minghui Xiong Juntao Yan Bo Chai Guozhi Fan Guangsen Song 

机构地区：[1]School of Chemical and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,China

出　　处：《Journal of Materials Science & Technology》2020年第21期179-188,共10页材料科学技术（英文版）

基　　金：financially supported by the Science and Technology Investigation Project of Hubei Provincial Department of Education,China(No.D20181805)。

摘　　要：Fabrication of 2D/2D heterojunction photocatalysts have attracted more attentions due to their inherent merits involving the large contact interface,short charge migration distance and plentiful active sites,which are beneficial for the enhancement of photocatalytic activity.Herein,a series of 2D/2D MoS_(2)/Cd S type-I heterojunctions were prepared by incorporation the exfoliating of bulk CdS and MoS_(2) with postsintering procedure.Multiple characteristic techniques were employed to corroborate the formation of heterojunctions.By optimizing the 2D MoS_(2) amounts in the heterojunction,the 7 wt.%2D/2D MoS_(2)/CdS heterojunction displayed the maximal photocatalytic H2 evolution rate of 18.43 mmol h^(-1) g^(-1) under visible light irradiation in the presence of lactic acid as the sacrificial reagent,which was 6 times higher than that of pristine 2D CdS.Based on the photoelectrochemical and photoluminescence spectra tests,it could be deduced that the charge separation and transfer of 2D/2D MoS_(2)/CdS heterojunction was tremendously improved,and the recombination of photoinduced electron-hole pairs was effectively impeded.Moreover,the 2D MoS_(2) was used as a cocatalyst to provide the abundant active sites and lower the overpotential for H_(2) generation reaction.The current work would offer an insight to fabricate the 2D/2D heterojunction photocatalysts for splitting H_(2)O into H_(2).

关 键 词：2D/2D heterojunctions Photocatalytic H_(2)evolution COCATALYSTS Charge separation and transfer 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]