Defect engineering of ternary Cu-In-Se quantum dots for boosting photoelectrochemical hydrogen generation

作     者：Shi Li Sung-Mok Jung Wookjin Chung Joo-Won Seo Hwapyong Kim Soo Ik Park Hyo Cheol Lee Ji Su Han Seung Beom Ha In Young Kim Su-Il In Jae-Yup Kim Jiwoong Yang Shi Li;Sung-Mok Jung;Wookjin Chung;Joo-Won Seo;Hwapyong Kim;Soo Ik Park;Hyo Cheol Lee;Ji Su Han;Seung Beom Ha;In Young Kim;Su-Il In;Jae-Yup Kim;Jiwoong Yang

作者机构：Department of Energy Science and EngineeringDaegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea Department of Chemical EngineeringDankook UniversityYonginRepublic of Korea Department of Chemistry and NanoscienceCollege of Natural ScienceEwha Womans UniversitySeoulRepublic of Korea Energy Science and Engineering Research CenterDaegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea 

出 版 物：《Carbon Energy》 (碳能源（英文）)

年 卷 期：2023年第5卷第12期

页      面：215-228页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(grant nos.2021R1C1C1007844 2021M3I3A1085039 2020R1F1A1061505 and 2020R1C1C1012014) 

主　　题：copper-indium-selenide defect engineering photoelectrochemical hydrogen generation quantum dots solar hydrogen 

摘      要：Heavy-metal-free ternary Cu–In–Se quantum dots(CISe QDs)are promising for solar fuel production because of their low toxicity,tunable band gap,and high light absorption *** defects significantly affect the photophysical properties of QDs,the influence on photoelectrochemical hydrogen production is not well ***,we present the defect engineering of CISe QDs for efficient solar-energy *** acid–base reactions between metal halide–oleylamine complexes and oleylammonium selenocarbamate are modulated to achieve CISe QDs with the controlled amount of Cu vacancies without changing their *** them,CISe QDs with In/Cu=1.55 show the most outstanding photoelectrochemical hydrogen generation with excellent photocurrent density of up to 10.7 mA cm-2(at 0.6 VRHE),attributed to the suitable electronic band structures and enhanced carrier concentrations/lifetimes of the *** proposed method,which can effectively control the defects in heavy-metal-free ternary QDs,offers a deeper understanding of the effects of the defects and provides a practical approach to enhance photoelectrochemical hydrogen generation.