Porous organic polymers for electrocatalysis

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 51(2), P. 761 - 791

Published: Jan. 1, 2022

Porous organic polymers (POPs) composed of building units linked via covalent bonds are a class lightweight porous network materials with high surface areas, tuneable pores, and designable components structures. Owing to their well-preserved characteristics in terms structure composition, POPs applied as electrocatalysts have shown promising activity achieved considerable advances numerous electrocatalytic reactions, including the hydrogen evolution reaction, oxygen reduction CO2 N2 nitrate/nitrite nitrobenzene oxidation benzyl alcohol reaction. Herein, we present systematic overview recent applications these reactions. The synthesis strategies, specific active sites, catalytic mechanisms summarized this review. fundamental principles some reactions also concluded. We further discuss current challenges perspectives on for applications. Meanwhile, possible future directions highlighted afford guidelines development efficient POP electrocatalysts.

Language: Английский

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Covalent organic frameworks for photocatalysis: Synthesis, structural features, fundamentals and performance

Coordination Chemistry Reviews, Journal Year: 2022, Volume and Issue: 475, P. 214889 - 214889

Published: Oct. 15, 2022

Language: Английский

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Porous organic polymers as a platform for sensing applications

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 51(6), P. 2031 - 2080

Published: Jan. 1, 2022

Sensing analysis is significantly important for human health and environmental safety. In this review, POPs used as platforms various sensing applications have been summarized discussed.

Language: Английский

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Green synthesis of olefin-linked covalent organic frameworks for hydrogen fuel cell applications

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

Published: March 31, 2021

Abstract Green synthesis of crystalline porous materials for energy-related applications is great significance but very challenging. Here, we create a green strategy to fabricate highly olefin-linked pyrazine-based covalent organic framework (COF) with high robustness and porosity under solvent-free conditions. The abundant nitrogen sites, hydrophilicity, well-defined one-dimensional nanochannels make the resulting COF an ideal platform confine stabilize H 3 PO 4 network in pores through hydrogen-bonding interactions. material exhibits low activation energy (E ) 0.06 eV, ultrahigh proton conductivity across wide relative humidity (10–90 %) temperature range (25–80 °C). A realistic exchange membrane fuel cell using as solid electrolyte achieve maximum power 135 mW cm −2 current density 676 mA , which exceeds all reported materials.

Language: Английский

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Covalent‐Organic Frameworks (COFs) as Proton Conductors

Advanced Energy Materials, Journal Year: 2021, Volume and Issue: 11(39)

Published: Sept. 1, 2021

Abstract Proton conductivity is the paramount property of proton‐conducting materials that are playing significant roles in diverse electrochemical devices with applications proton exchange membranes (PEMs) for fuel cells (PEMFCs). Considering scarcity fossil fuels, development clean and green renewable energy resources in‐demand across globe. Toward this direction, solid‐state conductors interest. The higher structural tunability, lower density, good crystallinity, accessible well‐defined pores, excellent thermal chemical stability covalent‐organic frameworks (COFs) make them versatile platforms as both under hydrous anhydrous conditions. Taking advantage such superior properties, reports on COFs have been increasing swiftly since 2014, which demands a summarization comprehensive discussion “at glance” visualization further development. In review, showcased newer class material. A presented by organizing strategies taken to develop COFs. Establishment structure–function relationships implementation discussed well. Moreover, challenges future prospects elaborately critically analyzed.

Language: Английский

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Recent advances in the development of electronically and ionically conductive metal-organic frameworks

Coordination Chemistry Reviews, Journal Year: 2021, Volume and Issue: 439, P. 213915 - 213915

Published: April 1, 2021

Language: Английский

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Surface‐Mediated Construction of an Ultrathin Free‐Standing Covalent Organic Framework Membrane for Efficient Proton Conduction

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(27), P. 14875 - 14880

Published: April 21, 2021

Abstract As a new class of crystalline porous organic materials, covalent frameworks (COFs) have attracted considerable attention for proton conduction owing to their regular channels and tailored functionality. However, most COFs are insoluble unprocessable, which makes membrane preparation practical use challenge. In this study, we used surface‐initiated condensation polymerization trialdehyde phenylenediamine the synthesis sulfonic COF (SCOF) coatings. The layer thickness could be finely tuned from 10 100 nm by controlling time. Moreover, free‐standing membranes were obtained sacrificing bridging without any decomposition structure. Benefiting abundant acid groups in channels, conductivity SCOF reached 0.54 S cm −1 at 80 °C pure water. To our knowledge, is one highest values pristine absence additional additives.

Language: Английский

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Covalent Organic Frameworks with Record Pore Apertures

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(11), P. 5145 - 5154

Published: March 8, 2022

The pore apertures dictate the guest accessibilities of pores, imparting diverse functions to porous materials. It is highly desired construct crystalline polymers with predesignable and uniform mesopores that can allow large organic, inorganic, biological molecules enter. However, due ease formation interpenetrated and/or fragile structures, largest aperture reported in metal-organic frameworks 8.5 nm, value for covalent organic (COFs) only 5.8 nm. Herein, we a series COFs record values from 7.7 10.0 nm by designing building blocks conformational rigidness, planarity, suitable local polarity. All obtained possess eclipsed stacking high crystallinity, permanent porosity, stability. As proof concept, successfully employed these separate pepsin ∼7 size its crudes protect tyrosinase heat-induced deactivation.

Language: Английский

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Superprotonic Conductivity of MOFs and Other Crystalline Platforms Beyond 10⁻¹ S cm⁻¹

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(31)

Published: May 28, 2021

Abstract The proton‐exchange membrane (PEM) is a fundamental module of fuel cells (PEMFCs), permitting proton passage and thus governing the overall performance PEMFCs. Till now, Nafion has been extensively used marketable PEM material due to its high protonic conductivity 10 −2 –10 −1 S cm under relative humidity 80–85 °C. On other hand, crystalline materials such as metal‐organic frameworks (MOFs), coordination polymers (CPs), covalent organic (COFs), hydrogen‐bonded framework (HOFs), metalo (MHOFs), polyoxometalates (POMs) are emerging potential materials, where crystallinity paved way study conduction pathway associated mechanisms understand structure‐function relationships. However, date, ultrahigh superprotonic level , close Nafion, relatively scarce for conductors. In this review, discussion focused on that demonstrate order higher those individual platforms (to be equal footing superior nafion, respectively) based their synthesis approach while highlighting design norms key features attaining conductivity. While critical analysis made, issues future prospects also addressed.

Language: Английский

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Hydrogen-bonded organic frameworks: design, applications, and prospects

Materials Advances, Journal Year: 2022, Volume and Issue: 3(9), P. 3680 - 3708

Published: Jan. 1, 2022

Hydrogen-bonded organic frameworks (HOFs) are crystalline porous polymers which formed by the interaction of hydrogen bonding among building blocks. Unique advantages HOFs, enabling new platforms for exploring multifunctional applications.

Language: Английский

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