Fabricating built-in electric field in fully enclosed carbon nitride/Fe-based MIL heterojunction for efficient CO2 photoreduction
Article
Article Title | Fabricating built-in electric field in fully enclosed carbon nitride/Fe-based MIL heterojunction for efficient CO2 photoreduction |
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ERA Journal ID | 3928 |
Article Category | Article |
Authors | Lyu, Ziying, Chen, Liang, Yin, Jianheng, Wu, Tenghu, Zhao, Kun, Shen, Shigang, Wang, Wenjing and Ge, Lei |
Journal Title | Separation and Purification Technology |
Journal Citation | 354 (8) |
Article Number | 129431 |
Number of Pages | 9 |
Year | 2024 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 1383-5866 |
1873-3794 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.seppur.2024.129431 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1383586624031708 |
Abstract | Designing structures such as heterojunctions to establish built-in electric fields, introduces inherent driving forces for charge separation and migration. The partial surface contact in the current g-C3N4/MIL-88B(Fe) heterojunction composites limits the migration capability of interfacial charges and the formation of a built-in electric field. In this study, we fabricated a built-in electric field in the fully enclosed g-C3N4/MIL-88B(Fe) (CNNS/M-NS) heterojunction using electrostatic self-assembly. The electric field facilitated the migration of photo-excited electrons from the M-NS conduction band to the CNNS valence band, while corresponding band bending prevented the electron backflow from the CNNS conduction band to the M-NS conduction band. The fully contacted CNNS/M-NS heterojunction demonstrated a CO yield of 13.09 μmol g−1 h−1, which was 5.62 times of pristine CNNS. This significant improvement was primarily due to the complete encapsulation of M-NS by CNNS, which improved charge separation efficiency and reduced the charge transfer resistance. DRIFTS tests confirmed that CNNS/M-NS effectively converted to CO through the sequential transformation of CO2*, COOH*, and CO* intermediates. DFT calculations revealed that M-NS had a higher work function than CNNS, leading to the charge transfer at the interface and the formation of a built-in electric field from CNNS to M-NS. This work proposes a novel design of fully enclosed g-C3N4/MIL-88B(Fe) heterojunctions using electrostatic self-assembly to improve CO2 photoreduction efficiency. |
Keywords | Electric field; Carbon nitride; MIL; Photocatalysis; CO2 reduction |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400404. Electrochemical energy storage and conversion |
Public Notes | The accessible file is the accepted version of the paper. Please refer to the URL for the published version. |
Byline Affiliations | Hebei University, China |
North China Electric Power University, China | |
University of Hebei, China | |
School of Engineering | |
Centre for Future Materials |
https://research.usq.edu.au/item/z94x7/fabricating-built-in-electric-field-in-fully-enclosed-carbon-nitride-fe-based-mil-heterojunction-for-efficient-co2-photoreduction
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