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 

机构地区：[1]Department of Energy Science and Engineering,Daegu Gyeongbuk Institute of Science and Technology(DGIST),Daegu,Republic of Korea [2]Department of Chemical Engineering,Dankook University,Yongin,Republic of Korea [3]Department of Chemistry and Nanoscience,College of Natural Science,Ewha Womans University,Seoul,Republic of Korea [4]Energy Science and Engineering Research Center,Daegu Gyeongbuk Institute of Science and Technology(DGIST),Daegu,Republic of Korea

出　　处：《Carbon Energy》2023年第12期215-228,共14页碳能源（英文）

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

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 coefficient.Although defects significantly affect the photophysical properties of QDs,the influence on photoelectrochemical hydrogen production is not well understood.Herein,we present the defect engineering of CISe QDs for efficient solar-energy conversion.Lewis 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 morphology.Among 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 QDs.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.

关 键 词：copper-indium-selenide defect engineering photoelectrochemical hydrogen generation quantum dots solar hydrogen 

分 类 号：O641.4[理学—物理化学]