Abstract
The development and synthesis of high-efficient, stable, and cost-effective photocatalysts to reduce both world-wide energy and environmental issues are the most significant challenge in CO 2 reduction. Herein, we explore the photocatalytic performance over NiFeV layered double hydroxide (LDH) nanosheets, g-C 3N 4, and NiFeV-LDH/g-C 3N 4 heterostructures, which convert CO 2 into high value-added fuels, such as CO and CH 4. The 2D/2D hierarchical flower-like structure created an outstanding heterosystem with close interfaces and prominently exposed catalytic active sites to dramatically improve light-harvesting ability. The charge transfer among the individual components made the separation of photogenerated charge carriers easier and lessened their recombination rate, enhancing the photoreduction of CO 2. The ratio of g-C 3N 4 to NiFeV-LDH in term of weight had a significant impact on the photocatalytic activity of the NiFeV-LDH/g-C 3N 4 heterostructure. The photocatalyst generated the maximum yields of CH 4 (15.2 µmol h −1g −1) when the weight ratio of g-C 3N 4 to NiFeV-LDHs was 15%, which was 4.04 times that of pure NiFeV-LDH. The yield of CO was 13.05 µmol h −1g −1, 3.15 times that of pure NiFeV-LDH. Furthermore, during cycling experimental runs, the optimized NiFeV-LDH/g-C 3N 4-15% heterostructure exhibited a remarkable photostability with no discernible change in the amounts of CO and CH 4 formation. The significantly improved photocatalytic performance towards CO 2 reduction was confirmed by the XPS and HRTEM analyses, which showed strong electronic interactions and promoted charge transfer between heterostructure components. The current study provides a feasible way to enhance the photocatalytic performance of LDH-based heterostructures and opens up new prospects for developing LDH-based photocatalysts towards CO 2 reduction.
Original language | English |
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Article number | 130249 |
Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
Volume | 655 |
Early online date | 27 Sept 2022 |
DOIs | |
Publication status | Published - 20 Dec 2022 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2022 Elsevier B.V.
Funding
This work was supported by the National Natural Science Foundation of China (62004155 , 11872302 , 12002271), and Young Talent Support Program of Xi'an Science and Technology Association (095920221347 , 09592022136
Keywords
- CO reduction
- Carbon nitride
- Heterostructure
- Layered double hydroxides
- Photocatalysis