Probing charge transfer of NiCo_(2)O_(4)/g-C_(3)N_(4)photocatalyst for hydrogen production  

作　　者：Songyu Yang Kailin Wang Zhen Wu Yan Wu 

机构地区：[1]Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China [2]Department of Chemical Engineering,Ordos Institute of Technology,Ordos 017000,China

出　　处：《Journal of Materials Science & Technology》2024年第33期253-264,共12页材料科学技术(英文版)

基　　金：supported by the National Natural Science Foun-dation of China(NSFC,Grant No.22378372).

摘　　要：Quantum dots/two-dimensional(0D/2D)semiconductor photocatalysts demonstrate wide solar light absorption region and high charge transfer efficiency.However,the relation between the interfacial electric field and the charge transfer during the photocatalytic hydrogen production process is still unclear.Here,we construct NiCo_(2)O_(4)quantum dots(QDs)and NiCo_(2)O_(4)nanoparticles(NPs)anchored with 2D g-C_(3)N_(4)(CN)to form NiCo_(2)O_(4)-QDs/CN and NiCo_(2)O_(4)-NPs/CN heterojunctions.The hydrogen production rate of CN loaded with NiCo_(2)O_(4)QDs is about 3 times higher than that of CN loaded with NiCo_(2)O_(4)NPs.The electric field intensity at the NiCo_(2)O_(4)-QDs/CN interface is calculated to be about 15,600 V cm−2,about 9 times higher than that of NiCo_(2)O_(4)-NPs/CN,which could effectively drive the electrons of CN to flow toward NiCo_(2)O_(4)QDs,promoting photocarriers separation and hence greatly improving the photocatalytic performance.This work provides a method to understand the relationship between interfacial electric field strength and photogenerated charges of heterostructure photocatalysts.

关 键 词：Quantum dots g-C_(3)N_(4)nanosheet S-scheme photocatalyst Interfacial electric field Surface potential probing 

分 类 号：F42[经济管理—产业经济]