In this work, we synthesize large-area thin films of a conjugated, imine-based, two-dimensional covalent organic framework at the solution/air interface. Thicknesses between ∼2-200 nm are achieved. Films can be transferred to any desired substrate by lifting from underneath, enabling their use as the semiconducting active layer in field-effect transistors.
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http://dx.doi.org/10.1039/c5cc04679c | DOI Listing |
Angew Chem Int Ed Engl
January 2025
Central South University, chemistry, CHINA.
The two-dimensional lamellar materials disperse platinum sites and minimize noble-metal usage for fuel cells, while mass transport resistance at the stacked layers spurs device failure with a significant performance decline in membrane electrode assembly (MEA). Herein, we implant porous and rigid sulfonated covalent organic frameworks (COF) into the graphene-based catalytic layer for the construction of steric mass-charge channels, which highly facilitates the activity of oxygen reduction reactions in both the rotating disk electrode (RDE) measurements and MEA device tests. Specifically, the normalized mass activity is remarkably boosted by 3.
View Article and Find Full Text PDFNatl Sci Rev
January 2025
Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry and Chemical Engineering, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Constructing 3D functional covalent organic frameworks (COFs) with both robust linkage and planar macrocycle building blocks still remains a challenge due to the difficulty in adjusting both the crystallinity and the dominant 2D structures. In addition, it is also challenging to selectively convert inert C(sp)-H bonds into value-added chemicals. Herein, robust 3D COFs, USTB-28-M (M=Co, Ni, Cu), have been polymerized from the nucleophilic aromatic substitution reaction of -symmetric 2,3,6,7,14,15-hexahydroxyltriptycene with -symmetric hexadecafluorophthalocyanine (MPcF) under solvothermal conditions.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Nankai University, College of Chemistry, No.94 Weijin Road, 300071, Tianjin, CHINA.
Aqueous proton batteries (APBs) have attracted increasing interest owing to their potential for grid-scale energy storage with extraordinary sustainability and excellent rate abilities. However, there are limited anode materials and it remains a great challenge to effectively balance capacity and cycling performance. Here, we report a covalent organic framework containing C=O and C=N dual active sites (TABQ-COF) as a high-capacity and long-cycle anode for proton batteries.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Shihezi University, School of chemistry and chemical engineering, CHINA.
Covalent organic frameworks (COFs) have recently been emerged as promising anode candidates for aqueous ammonium ion batteries (AAIBs), but suitable COFs need to be developed and the energy storage mechanisms need to be further investigated. Here we report an anthraquinone carbonyl-containing COF as anode for AAIBs, which exhibits a high specific capacity of 141 mAh g-1 at 0.1 A g-1 and good cycling stability with 90% retention after 8000 cycles at 6 A g-1.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
Soochow University, College of Energy, 688 Moye Road, Suzhou, CHINA.
The Zn metal anode in aqueous zinc-ion batteries (AZIBs) faces daunting challenges including undesired water-induced parasitic reactions and sluggish ion migration kinetics. Herein, we develop three-dimensional covalent organic framework (COF) membranes with bioinspired ion channels toward stabilized Zn anodes. These COFs, featured by zincophilic pyridine-N sites, enable effective regulation of water molecules at the anode-electrolyte interphase.
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