Strategies to improve the photocatalytic performance of covalent triazine frameworks

Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 11(40), P. 21470 - 21497

Published: Jan. 1, 2023

Various strategies for improving the photocatalytic performance of covalent triazine frameworks, including molecular design, structural regulation and creation heterostructures, are summarized.

Language: Английский

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Polycrystalline covalent organic frameworks

Materials Today, Journal Year: 2023, Volume and Issue: 71, P. 91 - 107

Published: Nov. 23, 2023

Language: Английский

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Role of Efficient Charge Transfer at the Interface between Mixed-Phase Copper-Cuprous Oxide and Conducting Polymer Nanostructures for Photocatalytic Water Splitting

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(15), P. 18867 - 18877

Published: April 6, 2023

Photocatalytic hydrogen generation from water splitting is regarded as a sustainable technology capable of producing green solar fuels. However, the low charge separation efficiencies and requirement lowering redox potentials are unresolved challenges. Herein, multiphase copper-cuprous oxide/polypyrrole (PPy) heterostructure has been designed to identify role multiple oxidation states metal oxides in reduction oxidation. The presence mixed phase PPy heterostructures enabled an exceptionally high photocatalytic H2 rate 41 mmol h-1 with apparent quantum efficiency 7.2% under visible light irradiation, which 7-fold augmentation contrast pure polymer. Interestingly, oxide/PPy exhibited higher carrier density, resistivity, 6 times photocurrent density compared Cu2O/PPy. Formation p-p-n junction between polymer mixed-phase oxide interfaces induce built-in electric field influences directional transfer that improves catalytic activity. Notably, photoexcited have significantly improved nanocubes nanofibers, revealed by femtosecond transient absorption spectroscopy. Additionally, photocatalyst demonstrates excellent stability without loss activity during cycling tests. present study highlights superior strategy boost reactions using achieve enhanced absorption, longer lifetimes, highly efficient O2 generation.

Language: Английский

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Bottom-Up Synthesis of Covalent Organic Frameworks with Quasi-Three-Dimensional Integrated Architecture via Interlayer Cross-Linking

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(11), P. 6507 - 6515

Published: March 13, 2023

Developing strategies to enhance the structural robustness of covalent organic frameworks (COFs) is great importance. Here, we rationally design and synthesize a class cross-linked COFs (CCOFs), in which two-dimensional (2D) COF layers are anchored connected by polyethylene glycol (PEG) or alkyl chains through bonds. The bottom-up fabrication these CCOFs achieved condensation aldehyde monomers tritopic amino monomers. All synthesized possess high crystallinity porosity, enhanced surpassing typical 2D COFs, means that they cannot be exfoliated under ultrasonication grinding due cross-linking effect. Furthermore, patterns PEG units uncovered experimental results Monte Carlo molecular dynamics simulations. It found all dominated vertical cross-layer (interlayer) connections (clearly observed high-resolution transmission electron microscopy images), allowing them form quasi-three-dimensional (quasi-3D) structures. This work bridges gap between 3D provides an efficient way improve interlayered stability COFs.

Language: Английский

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Coordination directed metal covalent organic frameworks

Materials Chemistry Frontiers, Journal Year: 2023, Volume and Issue: 7(15), P. 2995 - 3010

Published: Jan. 1, 2023

The research on coordination directed metal covalent organic frameworks (MCOFs) is systematically reviewed for the continued development of this emerging field.

Language: Английский

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