2D sp2 Carbon-Conjugated Covalent Organic Frameworks for Photocatalytic Hydrogen Production from Water

Jin, Enquan; Lan, Zhi‐An; Jiang, Qiuhong; Geng, Keyu; Li, Guosheng; Wang, Xinchen; Jiang, Donglin

doi:10.1016/j.chempr.2019.04.015

Cited by 486 publications

(389 citation statements)

References 48 publications

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“…[150] Thef ully p-conjugated sp 2 c-COF ( Figure 34) [151] with electron-accepting units at the lattice periphery exhibits greatly enhanced evolution of H 2 from water compared to imine-linked analogues and amorphous porous polymers. [152] Va rious semiconducting COFs with different band structures have been tested for photoinduced water splitting; nevertheless,the studies are still in their infancy.T oovercome the limitations,i ti sn ecessary to combine both water reduction and oxidation sites in one skeleton, and this deserves further research efforts.Adirect comparison of the photoenergy conversion efficiency of different systems on the basis of the H 2 evolution rates is difficult. This is because the rate is dependent on the light source,w avelength, device set up,a nd experimental scale.I nt he literature,d irect comparisons are often attempted, but this may cause misleading and unfair judgments to be made.Asafe way is to use the quantum yield that is determined by the number of electrons used in the H 2 evolution divided by the number of photons absorbed by the system.…”

Section: Angewandte Chemiementioning

confidence: 99%

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

et al. 2019

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A new approach has been developed to design organic polymers using topology diagrams. This strategy enables covalent integration of organic units into ordered topologies and creates a new polymer form, that is, covalent organic frameworks. This is a breakthrough in chemistry because it sets a molecular platform for synthesizing polymers with predesignable primary and high‐order structures, which has been a central aim for over a century but unattainable with traditional design principles. This new field has its own features that are distinct from conventional polymers. This Review summarizes the fundamentals as well as major progress by focusing on the chemistry used to design structures, including the principles, synthetic strategies, and control methods. We scrutinize built‐in functions that are specific to the structures by revealing various interplays and mechanisms involved in the expression of function. We propose major fundamental issues to be addressed in chemistry as well as future directions from physics, materials, and application perspectives.

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Section: Angewandte Chemiementioning

confidence: 99%

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

et al. 2019

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“…[147,149] [150] Die vollständig p-konjugierten sp 2 c-COFs (Abbildung 34) [151] mit Elektronenakzeptoreinheiten an der Gitterperipherie zeigen eine deutlich stärkere H 2 -Bildung aus Wasser als iminverknüpfte Analoga und amorphe porçse Polymere. [152] Verschiedene…”

Section: Halbleiterunclassified

Kovalente organische Gerüstverbindungen: chemische Ansätze für Designerstrukturen und integrierte Funktionen

et al. 2019

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Die Fortschritte der Chemie im letzten Jahrzehnt ebnen neue Wege zur Gestaltung organischer Polymere über Topologiediagramme. Dieser Ansatz ermöglicht das kovalente Zusammenfügen organischer Einheiten zu geordneten Topologien einer neuen Polymerform, den kovalenten organischen Gerüstverbindungen. Dies bedeutet einen Durchbruch in der Chemie, da nunmehr eine molekulare Plattform für die Synthese von Polymeren mit vorbestimmbaren Primärstrukturen und Strukturen höherer Ordnung zur Verfügung steht, ein zentrales Ziel, das über ein Jahrhundert lang angestrebt wurde, mit herkömmlichen Gestaltungsprinzipien aber nicht erreichbar war. Das neue Gebiet entwickelt seine eigenen Eigenschaften, die sich von jenen herkömmlicher Polymere unterscheiden. Unser Aufsatz fasst die Grundlagen und wichtigsten Fortschritte zusammen, wobei der Schwerpunkt auf der Chemie des Strukturdesigns liegt, einschließlich der Grundgedanken, Synthesestrategien und Kontrollverfahren. Wir prüfen integrierte, für die Strukturen spezifische Funktionen, indem wir verschiedene Wechselspiele und Mechanismen aufzeigen, die an der Expression der Funktion beteiligt sind. Wir benennen grundlegende Probleme, die in der Chemie und in zukünftigen Forschungsrichtungen der Physik und Materialwissenschaft zu adressieren sind, und beschreiben Anwendungsmöglichkeiten.

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“…For improving the photocatalytic performance, the crystallinity and hydrophilicity of the photocatalyst are reported to be the crucial factors. For example, imine‐linked COFs based on sulfone unit have shown excellent photocatalytic hydrogen evolution performance due to the good hydrophilicity and crystallinity,– whereas the study in hydrophilic CTFs is rarely demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Strong‐Base‐Assisted Synthesis of a Crystalline Covalent Triazine Framework with High Hydrophilicity via Benzylamine Monomer for Photocatalytic Water Splitting

et al. 2020

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Methods to synthesize crystalline covalent triazine frameworks (CTFs) are limited and little attention has been paid to development of hydrophilic CTFs and photocatalytic overall water splitting. A route to synthesize crystalline and hydrophilic CTF‐HUST‐A1 with a benzylamine‐functionalized monomer is presented. The base reagent used plays an important role in the enhancement of crystallinity and hydrophilicity. CTF‐HUST‐A1 exhibits good crystallinity, excellent hydrophilicity, and excellent photocatalytic activity in sacrificial photocatalytic hydrogen evolution (hydrogen evolution rate up to 9200 μmol g−1 h−1). Photocatalytic overall water splitting is achieved by depositing dual co‐catalysts in CTF‐HUST‐A1, with H2 evolution and O2 evolution rates of 25.4 μmol g−1 h−1 and 12.9 μmol g−1 h−1 in pure water without using sacrificial agent.

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2D sp2 Carbon-Conjugated Covalent Organic Frameworks for Photocatalytic Hydrogen Production from Water

Cited by 486 publications

References 48 publications

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

Kovalente organische Gerüstverbindungen: chemische Ansätze für Designerstrukturen und integrierte Funktionen

Strong‐Base‐Assisted Synthesis of a Crystalline Covalent Triazine Framework with High Hydrophilicity via Benzylamine Monomer for Photocatalytic Water Splitting

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