Light-to-Hydrogen Improvement Based on Three-Factored Au@CeO2/Gr Hierarchical Photocatalysts
- Authors
- Dung Van Dao; Choi, Hyuk; Nguyen, Thuy T. D.; Ki, Sang-Woo; Kim, Gyu-Cheol; Son, Hoki; Yang, Jin-Kyu; Yu, Yeon-Tae; Kim, Hyun You; Lee, In-Hwan
- Issue Date
- 24-5월-2022
- Publisher
- AMER CHEMICAL SOC
- Keywords
- plasmon; core-shell; ternary nanostructure; light-to-hydrogen; defect-rich surface
- Citation
- ACS NANO, v.16, no.5, pp.7848 - 7860
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 16
- Number
- 5
- Start Page
- 7848
- End Page
- 7860
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/142828
- DOI
- 10.1021/acsnano.2c00509
- ISSN
- 1936-0851
- Abstract
- Recently, various attempts have been made for light-to-fuels conversion, often with limited performance. Herein we report active and lasting three-factored hierarchical photocatalysts consisting of plasmon Au, ceria semiconductor, and graphene conductor for hydrogen production. The Au@CeO2/Gr(2.0) entity (graphene outer shell thickness of 2.0 nm) under visible-light irradiation exhibits a colossal achievement (8.0 mu mol mg(cat)(-1) h(-1)), which is 2.2- and 14.3-fold higher than those of binary Au@CeO2 and free-standing CeO2 species, outperforming the currently available catalysts. Yet, it delivers a high maximum quantum yield efficiency of 38.4% at an incident wavelength of 560 nm. These improvements are unambiguously attributed to three indispensable effects: (1) the plasmon resonant energy is light-excited and transferred to produce hot electrons localizing near the surface of Au@CeO2, where (2) the high-surface-area Gr conductive shell will capture them to direct hydrogen evolution reactions, and (3) the active graphene hybridized on the defect-rich surface of Au@CeO2 favorably adsorbs hydrogen atoms, which all bring up thorough insight into the working of a ternary Au@CeO2/Gr catalyst system in terms of light-to-hydrogen conversion.
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