Post-synthetic modification of covalent organic frameworks for CO2 electroreduction

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: June 26, 2023

To achieve high-efficiency catalysts for CO2 reduction reaction, various catalytic metal centres and linker molecules have been assembled into covalent organic frameworks. The amine-linkages enhance the binding ability of molecules, ionic frameworks enable to improve electronic conductivity charge transfer along However, directly synthesis with is hardly achieved due electrostatic repulsion predicament strength linkage. Herein, we demonstrate reaction by modulating linkers linkages template framework build correlation between performance structures Through double modifications, states are well tuned, resulting in controllable activity selectivity reaction. Notably, dual-functional achieves high a maximum CO Faradaic efficiency 97.32% turnover frequencies value 9922.68 h-1, which higher than those base single-modified Moreover, theoretical calculations further reveal that attributed easier formation immediate *CO from COOH*. This study provides insights developing

Language: Английский

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Donor-acceptor covalent organic framework/ZnIn2S4 core-shell structure S-scheme heterostructure for efficient photocatalytic hydrogen evolution

Nano Energy, Journal Year: 2024, Volume and Issue: 126, P. 109632 - 109632

Published: April 18, 2024

Language: Английский

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Development of Mn-MOF/CuO composites as platform for efficient electrocatalytic OER

Fuel, Journal Year: 2023, Volume and Issue: 341, P. 127638 - 127638

Published: Feb. 8, 2023

Language: Английский

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Single-Atom Catalysts on Covalent Organic Frameworks for Energy Applications

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 8, 2024

Single-atom catalysts (SACs) have been investigated and applied to energy conversion devices. However, issues of metal agglomeration, low loading, substrate stability hindered realization the SACs' full potential. Recently, covalent organic framework (COF)-based SACs emerged as promising materials enable highly efficient catalytic reactions. Here, we summarize representative COF-based their wide application in clean devices reactions, such hydrogen evolution reaction, carbon dioxide reduction nitrogen oxygen reaction. Based on catalysis conditions, these reactions are categorized into photocatalyzed electrocatalyzed We also design strategies, including heteroatom inclusion, donor–acceptor pairs, pore engineering, interface etc. Although promising, more efforts, linkage functional groups, ionization, multifunctional sites for cocatalyzed systems, etc., could improve them be ideal SAC materials. At end, provide our perspectives where field will proceed next 5 years.

Language: Английский

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A Bioinspired Free‐Standing 2D Crown‐Ether‐Based Polyimine Membrane for Selective Proton Transport

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(18)

Published: March 8, 2023

Biological proton channels play important roles in the delicate metabolism process, and have led to great interest mimicking selective transport. Herein, we designed a bioinspired transport membrane by incorporating flexible 14-crown-4 (14C4) units into rigid frameworks of polyimine films an interfacial Schiff base reaction. The Young's modulus reaches about 8.2 GPa. 14C4 could grab water, thereby forming hydrogen bond-water networks acting as jumping sites lower energy barrier molecular chains present vertical orientation membrane, ions travel between quasi-planar sheets. Furthermore, moieties bond alkali through host-guest interactions. Thus, ion conductance follows H+ ≫K+ >Na+ >Li+ , ultrahigh selectivity /Li+ (ca. 215) is obtained. This study provides effective avenue for developing ion-selective membranes embedding macrocycle motifs with inherent cavities.

Language: Английский

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Incorporating graphene oxide into COF membranes enables ultrahigh proton conductivity and ultralow H2 crossover

Journal of Membrane Science, Journal Year: 2023, Volume and Issue: 688, P. 122103 - 122103

Published: Sept. 27, 2023

Language: Английский

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Photochemical and Patternable Synthesis of 2D Covalent Organic Framework Thin Film Using Dynamic Liquid/Solid Interface

Small Methods, Journal Year: 2024, Volume and Issue: unknown

Published: May 9, 2024

Abstract 2D covalent organic frameworks (COFs) are highly porous crystalline materials with promising applications in electronics. Current methods involve either on‐surface synthesis (solid surface) or interfacial (liquid/liquid, liquid/gas interface) to create thin films for these applications, each its drawbacks. On‐surface can lead contamination from COF powder unreacted chemicals, while risks damaging the film during post‐transfer processes. These challenges necessitate development of alternative high‐quality films. This study presents a novel approach synthesizing homogeneous by combining photochemistry and liquid‐flowing system. Leveraging previous work on liquid flow systems prevent solvothermal synthesis, this photochemical method, resulting high‐crystalline tunable thickness is adopted. The offers spatially controllable energy sources, enabling patternable synthesis. Notably, it successfully fabricated ultrasmooth patterned hexagonal boron nitride, offering streamlined process optoelectronic device fabrication without additional pre, post‐processing steps.

Language: Английский

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Engineering heterostructured and hierarchical CoP/CoFeP nanosheet for effective oxygen evolution reaction in alkaline freshwater and seawater

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 71, P. 1342 - 1350

Published: May 26, 2024

Language: Английский

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Rational design of nitrogen and fluorine co-doped metal-free porous carbons electrocatalysts for highly efficient oxygen reduction and zinc-air batteries

Carbon Neutrality, Journal Year: 2025, Volume and Issue: 4(1)

Published: Jan. 6, 2025

Abstract The oxygen reduction reaction (ORR) is an important in fuel cells and metal air batteries. affected by slow kinetics the use of high-priced resource-scarce platinum-based catalysts. Therefore, there urgent need to develop cost-effective nonprecious catalysts for ORR replace Pt-based In this study, we used two-dimensional covalent organic frameworks (recorded as TF-COFs) precursors produce a metal-free nitrogen fluorine-co-doped porous carbon catalyst TF-800, TF-900, TF-1000, TF-1100). TF-1000 had high initial potential (0.90 V) half-wave (0.83 alkaline medium, indicating good catalytic activity. addition, stability was better than that commercial Pt/C (20%). This mainly because has specific surface area, fluorine atoms it have dispersion synergistic effects on polarization adjacent atoms. also shows excellent performance zinc-air based batteries, battery observed: peak power density reached 216.66 mW·cm –2 , capacity 752.86 mAh·g –1 at 10 mA·cm long-term charge–discharge demonstrated. work provides inspiration new strategies prepare future

Language: Английский

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Covalent Triazine Framework Polymer as a Photocatalyst for the Degradation of Ofloxacin under Visible Light Irradiation

Water Air & Soil Pollution, Journal Year: 2025, Volume and Issue: 236(3)

Published: Feb. 8, 2025

Language: Английский

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