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Defect engineering of ternary Cu–In–Se quantum dots for boosting photoelectrochemical hydrogen generation
- Title
- Defect engineering of ternary Cu–In–Se quantum dots for boosting photoelectrochemical hydrogen generation
- Authors
- Li; Shi; Jung; Sung-Mok; Chung; Wookjin; Seo; Joo-Won; Kim; Hwapyong; Park; Soo Ik; Lee; Hyo Cheol; Han; Ji Su; Ha; Seung Beom; In Young; In; Su-Il; Jae-Yup; Yang; Jiwoong
- Ewha Authors
- 김인영
- SCOPUS Author ID
- 김인영
- Issue Date
- 2023
- Journal Title
- Carbon Energy
- ISSN
- 2637-9368
- Citation
- Carbon Energy vol. 5, no. 12
- Keywords
- copper–indium–selenide; defect engineering; photoelectrochemical hydrogen generation; quantum dots; solar hydrogen
- Publisher
- John Wiley and Sons Inc
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- 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. © 2023 The Authors. Carbon Energy published by Wenzhou University and John Wiley & Sons Australia, Ltd.
- DOI
- 10.1002/cey2.384
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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