High-density active site COFs with a flower-like morphology for energy storage applications

He, Yuan; An, Ning; Meng, Congcong; Xie, Kefeng; Wang, Xiaotong; Dong, Xiu‐Yan; Sun, Daming; Yang, Yuying; Hu, Zhongai

doi:10.1039/d2ta01065h

Cited by 41 publications

(25 citation statements)

References 56 publications

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“…It can be observed that there are a pair of redox peaks at 0 to −0.2 V. This peak originates from the high-density quinone carbonyl sites in the COF skeleton and the DAAQ pillars. 18,49 The difference between the oxidation peak and the reduction peak potential is an important According to the calculation, the areal specific capacitance of AC-COFs at 1 mA cm −2 is 1034 mF cm −2 (397.7 F g −1 ), which is almost 230 times that of CC and 50 times that of DAAQ-Tp COFs. This value is better than most recently reported flexible electrodes used in supercapacitors (Table 1).…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…In addition, a significant signal was shown near 184 ppm, corresponding to carbonyl carbon. 18 In the thermal gravimetric analysis (TGA, Figure S13) under air, the pristine CC has no significant weight loss at 800 °C. The weight loss of modified AC, AC-DAAQ, CC/COFs, and AC-COFs at 25−200 °C is due to the evaporation of surfaceadsorbed water.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Figure b is the CV curves of pure DAAQ-Tp COFs, CC/COFs, and AC-COFs. It can be observed that there are a pair of redox peaks at 0 to −0.2 V. This peak originates from the high-density quinone carbonyl sites in the COF skeleton and the DAAQ pillars. , The difference between the oxidation peak and the reduction peak potential is an important parameter to evaluate the reversibility of electrochemical reactions. The AC-COFs electrode has a peak position difference of 0.041 V, but the CC/COF peak position difference reaches 0.286 V while the background current decreases.…”

Section: Resultsmentioning

confidence: 99%

“…16,17 In particular, 2D COFs with π-conjugated frameworks and abundant open nanopores can serve as ideal platforms for charge transport and energy storage. 18 On the one hand, researchers can directly adjust the pore size to facilitate the accelerated transport of ions to the reaction site. On the other hand, introducing redox-active functional groups into the main chain of COFs can provide pseudocapacitance for the material.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Compared with crystal porous material (MOF) having network structure, COFs exhibit superior chemical stability . Since its first discovery in 2005, research applications of COF materials have flourished in gas storage, separation, catalysis and sensing. , In particular, 2D COFs with π-conjugated frameworks and abundant open nanopores can serve as ideal platforms for charge transport and energy storage . On the one hand, researchers can directly adjust the pore size to facilitate the accelerated transport of ions to the reaction site.…”

Section: Introductionmentioning

confidence: 99%

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COF-Based Electrodes with Vertically Supported Tentacle Array for Ultrahigh Stability Flexible Energy Storage

Meng

et al. 2022

ACS Appl. Mater. Interfaces

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As an emerging porous crystal polymer, covalent organic frameworks (COFs) possess unique characteristics, such as high porosity, excellent stability, diverse topologies, designable open channels, and functional tunability. However, limited by the solid powder form, most COFs display low active site utilization and weak binding force with the current collector. In this pioneering research, we integrate redox-active COFs onto carbon fiber surfaces (AC-COFs) via strong covalent bridging. The 2,6diaminoanthraquinone (DAAQ) pillars embedded on the carbon fiber surface are the key to precisely controlling the growth direction of COFs. The obtained tentacle-like array vertically supported on the surface of the carbon fiber can effectively induce charge transfer and prevent COFs from aggregating/collapsing. The strong covalent coupling and increase of accessible active sites contributed to the high specific capacitance of AC-COFs electrode (1034 mF cm −2 ). In addition, the COF-based flexible electrode retains an initial capacitance of 98% after 20000 charge− discharge cycles. The flexible all-solid-state symmetric supercapacitor is assembled by PVA/H 2 SO 4 gel electrolyte with an areal capacitance of 715 mF cm −2 . Besides, a red LED can be easily powered by three-bending AC-COFs//AC-COFs devices. The innovative synthesis strategy opens up new opportunities to develop high-performance flexible energy storage devices based on COFs.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

COF-Based Electrodes with Vertically Supported Tentacle Array for Ultrahigh Stability Flexible Energy Storage

Meng

et al. 2022

ACS Appl. Mater. Interfaces

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Self‐Charging Aqueous Zn//COF Battery with UltraHigh Self‐Charging Efficiency and Rate

Zhong,

Wang,

et al. 2024

Advanced Materials

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Self‐charging zinc batteries that combine energy harvesting technology with batteries are candidates for reliable self‐charging power systems. However, the lack of rational materials design resulted in unsatisfactory self‐charging performance. Here, a covalent organic framework containing pyrene‐4,5,9,10‐tetraone groups (COF‐PTO) is reported as a cathode material for aqueous self‐charging zinc batteries. The ordered channel structure of the COF‐PTO provides excellent capacity retention performance and ultra‐fast ion transfer, with a capacity retention of up to 98% after 18000 cycles at 10 A g−1. To visually assess the self‐charging performance, two parameters, namely self‐charging efficiency (self‐charging discharge capacity/galvanostatic discharge capacity, η) and average self‐charging rate (total discharge capacity after cyclic self‐charging/total cyclic self‐charging time, ν), were proposed for performance evaluation. COF‐PTO achieved an impressive η of 96.9% and an ν of 30 mAh g−1 self‐charge capacity per hour in 100 self‐charging cycles, surpassing the previous reports. Mechanism studies reveal that COF‐PTO contains abundant C = O functional groups, enabling the co‐insertion of Zn2+ and H+ double ions in aqueous zinc ion batteries to achieve self‐charging performance. In addition, the C = N and C = O (on the benzene) in COF‐PTO are ortho structures to each other, which can easily form metal heterocycles with Zn ions, thereby driving the forward progress of the self‐charging reaction and enhancing the self‐charging performance. This work broadens the application scope of COF materials in aqueous zinc batteries and paves the way for designing high‐efficiency self‐charging batteries.This article is protected by copyright. All rights reserved

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Rapid Charge Transfer Enabled by Noncovalent Interaction through Guest Insertion in Supercapacitors based on Covalent Organic Frameworks

Jiang,

Wang,

et al. 2023

Angewandte Chemie

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Covalent organic frameworks (COFs) have been proposed for electrochemical energy storage, although the poor conductivity resulted from covalent bonds limits their practical performance. Here, we propose to introduce noncovalent bonds in COFs through a molecular insertion strategy for improving the conductivity of the COFs as supercapacitor. The synthesized COFs (MI‐COFs) establish equilibriums between covalent bonds and noncovalent bonds, which construct a continuous charge transfer channel to enhance the conductivity. The rapid charge transfer rate enables the COFs to activate the redox sites, bringing about excellent electrochemical energy storage behavior. The results show that the MI‐COFs exhibit much better performance in specific capacitance and capacity retention rate than those of most COFs‐based supercapacitors. Moreover, through simply altering inserted guests, the mode and strength of noncovalent bond can be adjusted to obtain different energy storage characteristics. The introduction of noncovalent bonds is an effective and flexible way to enhance and regulate the properties of COFs, providing a valuable direction for the development of novel COFs‐based energy storage materials.

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High-density active site COFs with a flower-like morphology for energy storage applications

Abstract: Redox-active covalent organic frameworks (COFs) are an emerging class of energy storage materials with notably abundant active sites, well-defined 1D channels and highly surface areas. However, during the process of...

Cited by 41 publications

References 56 publications

COF-Based Electrodes with Vertically Supported Tentacle Array for Ultrahigh Stability Flexible Energy Storage

COF-Based Electrodes with Vertically Supported Tentacle Array for Ultrahigh Stability Flexible Energy Storage

Self‐Charging Aqueous Zn//COF Battery with UltraHigh Self‐Charging Efficiency and Rate

Rapid Charge Transfer Enabled by Noncovalent Interaction through Guest Insertion in Supercapacitors based on Covalent Organic Frameworks

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