Constructing benzothiadiazole‐based donor‒acceptor covalent organic frameworks for efficient photocatalytic H₂ evolution

Aggregate, Год журнала: 2024, Номер unknown

Опубликована: Окт. 3, 2024

Abstract Donor‒acceptor covalent organic frameworks (D‒A COFs) have been regarded as promising materials for photocatalytic water splitting because of their tunable band gaps. However, efficiency is hindered by fast charge recombination and low photostability. Herein, we proposed a donor structural engineering strategy improving the activity D‒A COFs to tackle these problems. Two benzothiadiazole‐based (DHU‐COF‐BB DHU‐COF‐BP) with distinct donors were prepared H 2 evolution reaction (HER). As comparison, DHU‐COF‐TB without benzothiadiazole moieties was also designed synthesized. Impressively, production rate DHU‐COF‐BB reaches 12.80 mmol g −1 h under visible light irradiation (≥420 nm), which nearly 2.0 3.1 times higher than that DHU‐COF‐BP (6.47 ) (4.06 ), respectively. In addition, apparent quantum (AQE) up 5.04% at 420 nm. Photocatalytic electrochemical measurements indicate enhanced hydrogen can be ascribed introduction appropriate benzene moiety into donors, increases separation thereby suppresses electron‒hole recombination. Density functional theory (DFT) calculations revealed both triphenylamine units are main active sites HER over DHU‐COF‐BB. This work provides new insight strategy.

Язык: Английский

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Molecular engineering toward large pore-sized covalent organic frameworks

Chemical Synthesis, Год журнала: 2024, Номер 4(1)

Опубликована: Фев. 18, 2024

In recent years, covalent organic frameworks (COFs) as designable crystalline porous polymers have attracted widespread attention because of their tunable structures and functionalities. particular, the unique characteristics COFs, such readily controllable pore size, high surface area, editable environment, exceptional chemical stability, provide a structural basis for loading large-sized organic, inorganic, biological molecules hetero-catalysis, energy storage, other applications. this review, we discuss state-of-the-art strategies design synthesis, properties, functionalities large size two-dimensional three-dimensional spotlighting breakthrough achievements remarkable progress to guide further efforts in field.

Язык: Английский

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Dynamic Imine Exchange Enables Access to Nanoporous Covalent Organic Frameworks with High Crystallinity for the Heck Reaction

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(8), С. 9668 - 9677

Опубликована: Апрель 9, 2024

Two-dimensional covalent organic frameworks (2D COFs) represent a useful class of porous crystalline materials with promising applications. However, the lack facile and general approach for construction highly COFs desirable structures functionalities still hinders their practical Herein, we report dynamic imine exchange strategy fabricating nanoporous high crystallinity by using aryl-protected imines as building blocks. Two 2D (i.e., COF-TD-Cl COF-TP-Cl) higher yield larger specific surface area were synthesized compared counterparts prepared direct condensation. Given its good stability, was further coordinated palladium(II) trifluoroacetate through postsynthetic modification. The as-synthesized Pd/COF-TD-Cl exhibited remarkable catalytic activity heterogeneous catalyst Heck cross-coupling reaction could be recycled up to ten times without significant loss activity. This contribution not only provides an effective produce but also extends potential applications COF-based composites in catalysis.

Язык: Английский

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Uric acid biosensors based on molecular recognition: Classifications, Advances, and Prospects

TrAC Trends in Analytical Chemistry, Год журнала: 2024, Номер 179, С. 117887 - 117887

Опубликована: Июль 23, 2024

Язык: Английский

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Three-dimensional covalent organic frameworks for advanced membrane separations

Advanced Membranes, Год журнала: 2024, Номер unknown, С. 100109 - 100109

Опубликована: Окт. 1, 2024

Язык: Английский

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