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Insightful understanding of hot-carrier generation and transfer in plasmonic Au@CeO2 core-shell photocatalysts for light-driven hydrogen evolution improvement

Authors
Dung Van DaoNguyen, Thuy T. D.Uthirakumar, PeriyayyaCho, Yeong-HoonKim, Gyu-CheolYang, Jin-KyuDuy-Thanh TranThanh Duc LeChoi, HyukKim, Hyun YouYu, Yeon-TaeLee, In-Hwan
Issue Date
5-6월-2021
Publisher
ELSEVIER
Keywords
Plasmonic; Au@CeO(2)core-shell; Hot-carrier; Photocatalyst; Hydrogen production
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.286
Indexed
SCIE
SCOPUS
Journal Title
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume
286
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/127864
DOI
10.1016/j.apcatb.2021.119947
ISSN
0926-3373
Abstract
Plasmonic metal@semiconductor core-shell nanoparticles (CSNPs) are considered as promising candidates for artificial photosynthesis. Herein, Au@CeO2 CSNPs are hydrothermally fabricated for photocatalytic hydrogen evolution reaction (HER). CSNPs deliver superior HER performance compared to free CeO2. In particular, Au@CeO2-18 model (shell thickness of 18 nm) produces an HER rate of 4.05 mu mol mg(-1) h(-1), which is similar to 10 times higher than that of pure CeO2 (0.40 mu mol mg(-1) h(-1)) under visible-light. Additionally, Au@CeO2-18 photocatalyst demonstrates long-term stability after five repetitive runs, at which point it only loses approximately 5% of the activity, while core-free CeO2 decreases by 37.5 %. Such improvements are attributed to the electronic interactions between Au and CeO2, which not only enriches Ce3+ active sites to narrow bandgap of ceria toward visible, but also increases the affinity for hydrogen ions on the CSNPs surface. Moreover, localized surface plasmon resonance is light-excited and decays to efficiently produce hot-carrier to drive catalytic reactions.
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공과대학 (신소재공학부)
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