Structural Motifs in Covalent Organic Frameworks for Photocatalysis

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: March 10, 2024

Abstract Covalent organic frameworks (COFs) attract significant attention due to their ordered, crystalline, porous, metal‐free, and predictable structures. These unique characteristics offer great opportunities for the diffusion transmission of photogenerated charges during photocatalysis. Currently, a considerable number COFs are used as metal‐free semiconductor photocatalysts. This review aims understand relationships between structure photocatalysis performance provides in‐depth insight into synthetic strategy improve performance. Subsequently, focuses on structural motif in sustainable photocatalytic hydrogen evolution, carbon dioxide reduction, peroxide generation, compound transformations. Last, conjunction with progress achieved challenges yet be overcome, candid discussion is undertaken regarding field COF photocatalysis, accompanied by presentation potential research avenues future directions. seeks provide readers comprehensive understanding pivotal role robust guidance innovative utilization

Language: Английский

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Covalent Organic Frameworks for Photocatalytic Reduction of Carbon Dioxide: A Review

ACS Nano, Journal Year: 2024, Volume and Issue: 18(33), P. 21804 - 21835

Published: Aug. 8, 2024

Covalent organic frameworks (COFs) are crystalline networks with extended backbones cross-linked by covalent bonds. Due to the semiconductive properties and variable metal coordinating sites, along rapid development in linkage chemistry, utilization of COFs photocatalytic CO2RR has attracted many scientists' interests. In this Review, we summarize latest research progress on for CO2 reduction. first part, present COF linkages that have been used CO2RR, discuss four mechanisms including as intrinsic photocatalysts, photosensitive motifs metalated semiconductors heterojunction photocatalysts. Then, principles structural designs functional building units stacking mode exchange. Finally, outlook challenges provided. This Review is intended give some guidance design synthesis diverse different linkages, various structures, divergent modes efficient photoreduction CO2.

Language: Английский

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One‐Dimensional Covalent Organic Framework‐Based Multilevel Memristors for Neuromorphic Computing

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(20)

Published: March 21, 2024

Abstract Memristors are essential components of neuromorphic systems that mimic the synaptic plasticity observed in biological neurons. In this study, a novel approach employing one‐dimensional covalent organic framework (1D COF) films was explored to enhance performance memristors. The unique structural and electronic properties two 1D COF (COF‐4,4′‐methylenedianiline (MDA) COF‐4,4′‐oxydianiline (ODA)) offer advantages for multilevel resistive switching, which is key feature computing applications. By further introducing TiO 2 layer on COF‐ODA film, built‐in electric field between COF‐TiO interfaces could be generated, demonstrating feasibility utilizing COFs as platform constructing memristors with tunable states. nanochannels these structures contributed efficient modulation electrical conductance, enabling precise control over weights circuits. This study also investigated potential COF‐based achieve energy‐efficient high‐density memory devices.

Language: Английский

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Covalent Organic Frameworks (COFs) for CO2 Utilizations

Carbon Capture Science & Technology, Journal Year: 2025, Volume and Issue: unknown, P. 100365 - 100365

Published: Jan. 1, 2025

Language: Английский

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Facile Transformation of Imine Linkages and Functionalization of Aldehyde in the Covalent Organic Frameworks for Stable and Enhanced Photocatalytic Hydrogen Peroxide Production

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Imine-based covalent organic frameworks (COFs) have been widely applied in photocatalytic hydrogen peroxide (H2O2) production because of their highly crystalline properties and tunable chemical structures. However, the inherent polarization C═N linkage brings a high energy barrier for π-electron delocalization, impeding in-plane photoelectron transfer process, which leads to an inadequate efficiency H2O2 photosynthesis. In addition, stability most imine-COFs remains insufficient due reversible nature imine linkage. Herein, quinoline-linked COF (Ald-TTB-TTA) bearing polar aldehyde groups was constructed by postsynthetic conversion (TTB-TTA). The expanded conjugate planes facilitate charge transfer, accelerating proton-coupled electron oxygen reduction reaction (ORR) process. As expected, Ald-TTB-TTA achieves considerable rate 3169 μmol g–1 h–1 without sacrificial agent, surpassing its imine-linked counterpart (1944 h–1). Therefore, this work provides facile strategy designing functional COFs is expected aid construction high-performance catalysts photosynthesis H2O2.

Language: Английский

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Pyrene-based porous organic materials for visible light photocatalysis

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 513, P. 215902 - 215902

Published: May 4, 2024

Language: Английский

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Rational Design of Covalent Organic Frameworks as Photocatalysts for Water Splitting

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 1, 2024

Abstract Photocatalytic water splitting for hydrogen production represents a crucial approach obtaining green energy through artificial solar utilization, offering sustainable method generation that helps mitigate shortages and protect the environment. Among numerous photocatalytic materials, covalent organic frameworks (COFs) have garnered significant attention intensive study from researchers due to their distinctive benefits, such as porosity, pre‐design capability, tunability at atomic level. Significant advancements are made in development of enhancement performance, comprehension mechanisms. In this review, recent COF‐based spotlighted, both half‐reactions overall reactions, with particular emphasis on rational design COF structures regulate materials' optical electrical properties, well fundamental processes photocatalysis. Drawing current research field, existing challenges, potential opportunities also discussed future development.

Language: Английский

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Fabrication of p–n Heterostructured Photocatalysts with Triazine-Based Covalent Organic Framework and CuInS₂ for High-Efficiency CO₂ Reduction

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(11), P. 13839 - 13848

Published: March 6, 2024

The application of covalent organic frameworks (COFs) for the photocatalytic reduction CO2 is mostly limited by severe charge recombination and low sunlight utilization. Herein, a triazine-based COF with an electron-rich large π-conjugated system (TCOF) was employed as building block integrated CuInS2 (CIS) to construct noble-metal-free high-efficiency photocatalyst reduction. in situ growth CIS nanosheets on TCOF creates p–n heterojunction, named CIS@TCOF. Compared TCOF, CIS@TCOF heterostructure exhibits dramatically boosted performance CO2. produced HCOOH yield over 10 wt % can be up 171.2 μmol g–1 h–1 under visible light irradiation good reproducibility, which about 3 times high that TCOF. Further in-depth studies indicate introduction not only enhances utilization but also restrains photogenerated electron–hole pairs efficiently facilitates photoinduced transfer via heterojunction due unique structural compositional features. This research shows great potential COFs efficient carbon fixation materials provides versatile route semiconductor-COF heterostructures photocatalysis.

Language: Английский

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Regulating Benzene Ring Number as Connector in Covalent Organic Framework for Boosting Photosynthesis of H₂O₂ from Seawater

Nano Letters, Journal Year: 2024, Volume and Issue: 24(12), P. 3819 - 3825

Published: March 15, 2024

Photosynthesis of H2O2 from seawater represents a promising pathway to acquire H2O2, but it is still restricted by the lack highly active photocatalyst. In this work, we propose convenient strategy regulating number benzene rings boost catalytic activity materials. This demonstrated ECUT-COF-31 with adding two as connector, which can result in 1.7-fold enhancement production rate relative ECUT-COF-30 just one ring connector. The reason for mainly due release *OOH surface catalyst and final formation being easier than ECUT-COF-30. Moreover, provides stable photogeneration 70 h, theoretically remarkable 58.7 mmol per day using gram photocatalyst, while cost used raw material low 0.24 $/g.

Language: Английский

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Functional Regulation of Covalent Organic Frameworks for Photocatalytic Water Splitting

ACS Materials Letters, Journal Year: 2024, Volume and Issue: 6(6), P. 2276 - 2294

Published: May 10, 2024

Solar-driven water splitting into hydrogen and oxygen fuels represents a promising way for clean energy production to achieve carbon-neutral future. The efficiency of photocatalytic strongly relies on the development high-performance catalysts. Noteworthily, covalent organic frameworks (COFs) offer distinctive platform designing photo-to-chemical conversion, benefiting from their tailorable structure, ultrahigh porosity, robust framework, sufficient light absorption, rich active sites. Herein we highlight systematic overview recent research progress using COFs half-reactions overall splitting. With an aim shed understanding structural design COF photocatalysts splitting, various functional strategies are discussed. Finally, major challenges future perspectives proposed with hope achieving ongoing this emerging field.

Language: Английский

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