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Defect-rich N-doped CeO2 supported by N-doped graphene as a metal-free plasmonic hydrogen evolution photocatalyst

Authors
Van Dao, DungJung, Hyun DongNguyen, Thuy T. D.Ki, Sang-WooSon, HokiBae, Kang-BinLe, Thanh DucCho, Yeong-HoonYang, Jin-KyuYu, Yeon-TaeBack, SeoinLee, In-Hwan
Issue Date
28-4월-2021
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.16, pp.10217 - 10230
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY A
Volume
9
Number
16
Start Page
10217
End Page
10230
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137446
DOI
10.1039/d1ta01379c
ISSN
2050-7488
Abstract
Heteroatom doping into metal oxides advantageously modulates optoelectronic properties and provides promising possibilities for efficient light-to-energy conversion. Herein, nitrogen-doped ceria (N-CeO2) nanoparticles are prepared and then coupled with nitrogen-doped graphene (N-Gr) to create an active and long-lasting N-CeO2/N-Gr heterocatalyst. Optoelectronic features of N-doping materials (e.g., plasmon) are significantly improved toward the visible-light region, particularly for 3.9% N-CeO2/N-Gr nanocomposites. Namely, the 3.9% N-CeO2 possesses numerous catalytic active defects (N states, oxygen vacancy, and Ce3+ species), leading to a narrow bandgap energy and to the improved plasmonic properties of the ceria host, while the N-Gr preferably serves as an electron scavenger to collect plasmon-generated hot electrons migrating from 3.9% N-CeO2 to drive photocatalytic reactions under the irradiation of visible-light. Resultantly, the 3.9% N-CeO2/N-Gr photocatalyst delivers an impressive hydrogen evolution reaction (HER) rate of 3.7 mu mol mg(cat)(-1) h(-1) under visible-light, which is 2.0- and 8.2-fold greater than those obtained from 3.9% N-CeO2 and CeO2 ones, respectively. Additionally, the combination of 3.9% N-CeO2 and N-Gr synergistically produces a long-lasting plasmonic HER photocatalyst system. Metal-free plasmonic N-doped oxides supported by N-doped graphene pave a promising pathway for efficient light-to-hydrogen fuel production accordingly.
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