Extending the π‐Conjugation of A Donor‐Acceptor Covalent Organic Framework for High‐Rate and High‐Capacity Lithium‐Ion Batteries

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(48)

Published: Aug. 13, 2024

Abstract Realizing high‐rate and high‐capacity features of Lihium‐organic batteries is essential for their practical use but remains a big challenge, which due to the instrinsic poor conductivity, limited redox kinetics low utility organic electrode mateials. This work presents well‐designed donor‐acceptor Covalent Organic Framework (COFs) with extended conjugation, mesoscale porosity, dual redox‐active centers promote fast charge transfer multi‐electron processes. As anticipated, prepared cathode benzo [1,2‐b:3,4‐b′:5,6‐b′′] trithiophene (BTT) as p‐type pyrene‐4,5,9,10‐tetraone (PTO) n‐type material (BTT‐PTO‐COF) delivers impressive specific capacity (218 mAh g −1 at 0.2 A in ether‐based electrolyte 275 carbonate‐based electrolyte) outstanding rate capability (79 50 124 10 electrolyte). In addition, potential BTT‐PTO‐COF prototype has been demonstrated by full cells dual‐ion (FDIBs), attain comparable electrochemical performances half cells. Moreover, mechanism studies combining ex situ characterization theoratical calculations reveal efficient storage process facile BTT‐PTO‐COF. not only expands diversity COFs also provide concept structure design electrodes.

Language: Английский

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Solution processable triarylamine-based polyamide for electrochromic supercapacitors and smart displays with energy reuse

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 684, P. 11 - 20

Published: Jan. 4, 2025

Language: Английский

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Thiazolium‐Linked Crystalline Porous Covalent Organic Frameworks for Mixed Electronic‐Ionic Transport

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: March 9, 2025

Abstract Developing efficiently mixed electronic‐ionic (MEI) conductive microcosmic pathways within a single functional material is essential yet challenging for electronic devices. Covalent organic frameworks (COFs) feature pre‐designed functionalities and uniform pores, making them highly desirable platforms transporting electrons ions. However, MEI COFs, achieving high crystallinity when incorporating high‐density ionic groups the extensively π‐electron delocalized skeletons remain challenge due to intermolecular interactions. Herein, we reported “pre‐polymerization followed by self‐ionization” approach synthesize new thiazolium‐linked COFs (MEICOFs, M═Cu, Co, Fe), where synthesized following connection of building blocks. MEICOFs demonstrated broad ultraviolet‐visible‐near‐infrared absorption bands narrow bandgaps. As proof concept, hydroxide conductivity CuEICOF was determined be 55.2 0.01 S m −1 , respectively. Moreover, film could directly catalyze oxygen reduction reaction without additional agent rotation electrode.

Language: Английский

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Thiadiazole-Derived Covalent Organic Framework Macroscopic Ultralight Aerogel

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(30), P. 36738 - 36747

Published: July 24, 2023

Shaping covalent organic frameworks (COFs) into macroscopic objects for practical application remains a huge challenge. Herein, new thiadiazole-derived COF ultralight aerogel (NNS-VCOF) was prepared through acid-catalyzed aldol condensation between 2,5-dimethyl-1,3,4-thiadiazole and tritopic aromatic aldehyde derivative. NNS-VCOF shows extremely low density (ca. 0.020 g cm-3), excellent mechanical properties (compression modulus of 16.65 kPa), thermal insulation (low conductivity 0.03270 W m-1 K-1 at 25 °C), flame retardancy (quickly self-extinguishing after ignition) due to its three-dimensional sponge-like architecture special nitrogen heterocyclic framework. To our delight, not only can be used as an outstanding material but also efficient photocatalytic hydrogen evolution in powder state because the superhydrophilicity appropriate optical properties.

Language: Английский

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Novel covalent organic framework/carbon nanotube composites with multiple redox-active sites for high-performance Na storage

Energy storage materials, Journal Year: 2023, Volume and Issue: 65, P. 103142 - 103142

Published: Dec. 17, 2023

Language: Английский

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