Covalent organic frameworks (COFs) for electrochemical applications

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(12), P. 6871 - 6913

Published: Jan. 1, 2021

This review article summarizes the design principles and strategies for synthesis of functional COFs, with a special focus on their potential electrochemical applications.

Language: Английский

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Molecularly Engineered Covalent Organic Frameworks for Hydrogen Peroxide Photosynthesis

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(19)

Published: Feb. 15, 2022

Synthesizing H

Language: Английский

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Covalent organic frameworks

Nature Reviews Methods Primers, Journal Year: 2023, Volume and Issue: 3(1)

Published: Jan. 12, 2023

Language: Английский

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Application of MOFs and COFs for photocatalysis in CO2 reduction, H2 generation, and environmental treatment

EnergyChem, Journal Year: 2022, Volume and Issue: 4(4), P. 100078 - 100078

Published: June 25, 2022

Language: Английский

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Accelerated Synthesis and Discovery of Covalent Organic Framework Photocatalysts for Hydrogen Peroxide Production

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(22), P. 9902 - 9909

Published: May 30, 2022

A high-throughput sonochemical synthesis and testing strategy was developed to discover covalent organic frameworks (COFs) for photocatalysis. In total, 76 conjugated polymers were synthesized, including 60 crystalline COFs of which 18 previously unreported. These then screened photocatalytic hydrogen peroxide (H2O2) production using water oxygen. One these COFs, sonoCOF-F2, found be an excellent photocatalyst H2O2 even in the absence sacrificial donors. However, after long-term tests (96 h), imine sonoCOF-F2 transformed into amide-linked COF with reduced crystallinity loss electronic conjugation, decreasing activity. When benzyl alcohol introduced form a two-phase catalytic system, photostability greatly enhanced, leading stable at least 1 week.

Language: Английский

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Photocatalytic H2O2 production Systems: Design strategies and environmental applications

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 451, P. 138489 - 138489

Published: Aug. 5, 2022

Language: Английский

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Mechanistic analysis of multiple processes controlling solar-driven H2O2 synthesis using engineered polymeric carbon nitride

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: June 17, 2021

Abstract Solar-driven hydrogen peroxide (H 2 O ) production presents unique merits of sustainability and environmental friendliness. Herein, efficient solar-driven H through dioxygen reduction is achieved by employing polymeric carbon nitride framework with sodium cyanaminate moiety, affording a rate 18.7 μmol h −1 mg an apparent quantum yield 27.6% at 380 nm. The overall photocatalytic transformation process systematically analyzed, some previously unknown structural features interactions are substantiated via experimental theoretical methods. cyanamino group pyridinic nitrogen-coordinated soidum in the promote photon absorption, alter energy landscape improve charge separation efficiency, enhance surface adsorption dioxygen, create selective 2e − oxygen reaction surface-active sites. Particularly, electronic coupling interaction between surface, which boosts population prolongs lifetime active shallow-trapped electrons, experimentally substantiated.

Language: Английский

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Photoredox catalysis over semiconductors for light-driven hydrogen peroxide production

Green Chemistry, Journal Year: 2021, Volume and Issue: 23(4), P. 1466 - 1494

Published: Jan. 1, 2021

This critical review presents recent advances in light-driven H₂O₂ production from the viewpoint of generation pathways.

Language: Английский

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A Crystalline Partially Fluorinated Triazine Covalent Organic Framework for Efficient Photosynthesis of Hydrogen Peroxide

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(19)

Published: March 1, 2022

A partially fluorinated, metal-free, imine-linked two-dimensional triazine covalent organic framework (TF50 -COF) photocatalyst was developed. Fluorine (F)-substituted and nonsubstituted units were integrated in equimolar amounts on the edge aromatic units, where they mediated two-electron O2 photoreduction. F-substitution created an abundance of Lewis acid sites, which regulated electronic distribution adjacent carbon atoms provided highly active sites for adsorption, widened visible-light-responsive range catalyst, while enhancing charge separation. Varying proportion F maximized interlayer interactions TF50 -COF, resulting improved crystallinity with faster carrier transfer robust photostability. The -COF catalyst demonstrates high selectivity stability photoreduction into H2 , a yield rate 1739 μmol h-1 g-1 remarkable apparent quantum efficiency 5.1 % at 400 nm, exceeding performance previously reported nonmetal COF-based photocatalysts.

Language: Английский

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Rational Design of Covalent Heptazine Frameworks with Spatially Separated Redox Centers for High‐Efficiency Photocatalytic Hydrogen Peroxide Production

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(7)

Published: Nov. 24, 2021

The redox reaction centers in natural organisms conducting oxygenic photosynthesis are well arranged a physically separated manner to convert sunlight into chemical energy efficiently. Mimicking via precisely constructing oxidative and reductive within photocatalysts is ideal for enhancing catalytic performances artificial photosynthesis. In this study, new covalent heptazine frameworks (CHFs) with spatially rationally designed photocatalytic production of H2 O2 from water oxygen without using any sacrificial agents. Both experimental computational investigations indicate that the two-electron reduction occurs on moiety, whereas oxidation acetylene or diacetylene bond CHFs. This unique spatial separation feature critical charge achieving efficient production. Meanwhile, measured exciton binding diacetylene-containing polymer merely 24 meV. Under simulated solar irradiation, CHFs can achieve solar-to-chemical conversion efficiency 0.78%, surpassing previously reported materials. study establishes molecular engineering approach construct periodically single-component photocatalysts, representing hallmark create more exciting structures photocatalysis moving forward.

Language: Английский

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