Carbon-based elastic foams supported redox-active covalent organic frameworks for flexible supercapacitors

Dong, Yanying; Wang, Yonglin; Zhang, Xiaofang; Lai, Quirino; Yang, Yingkui

doi:10.1016/j.cej.2022.137858

Cited by 35 publications

(27 citation statements)

References 50 publications

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“…The ABA–COF superlattice has a 7.0% higher percentage of surface capacitance than BAB–COF, which can be mainly attributed to the increased contribution of pseudocapacitance in this nanoscale structure [ 47 ], confirming the microporous charge accumulation effect of mesoporous–microporous stacking in its internal “nano-hourglass” physical structure (Fig. 2 h) [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…The COF films prepared by surfactant monolayer-assisted interfacial synthesis (SMAIS) strategy exhibit large size, smoothness and ease of transfer [ 24 ], which maybe provide a possible way to obtain periodically complete and ordered 2D COF superlattices with high quality and controlled stacking. In addition, each COF layer can be pre-designed with active units and pore size based on the energy storage mechanisms, acting as both host and interface materials to effectively promote charge transfer/storage and further improve electrochemical performance [ 25 , 26 ]. This means that 2D COF superlattices can realize the control of thickness and structure concurrently, and utilize the properties of each isolated layer to derive synergistic effects, which may be an effective way to obtain satisfactory overall supercapacitor performance [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, each COF layer can be pre-designed with active units and pore size based on the energy storage mechanisms, acting as both host and interface materials to effectively promote charge transfer/storage and further improve electrochemical performance [ 25 , 26 ]. This means that 2D COF superlattices can realize the control of thickness and structure concurrently, and utilize the properties of each isolated layer to derive synergistic effects, which may be an effective way to obtain satisfactory overall supercapacitor performance [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Bending Resistance Covalent Organic Framework Superlattice: “Nano-Hourglass”-Induced Charge Accumulation for Flexible In-Plane Micro-Supercapacitors

Zhang

Xiong

et al. 2022

Nano-Micro Lett.

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Covalent organic framework (COF) film with highly exposed active sites is considered as the promising flexible self-supported electrode for in-plane micro-supercapacitor (MSC). Superlattice configuration assembled alternately by different nanofilms based on van der Waals force can integrate the advantages of each isolated layer to exhibit unexpected performances as MSC film electrodes, which may be a novel option to ensure energy output. Herein, a mesoporous free-standing A-COF nanofilm (pore size is 3.9 nm, averaged thickness is 4.1 nm) with imine bond linkage and a microporous B-COF nanofilm (pore size is 1.5 nm, averaged thickness is 9.3 nm) with β-keto-enamine-linkages are prepared, and for the first time, we assembly the two lattice matching films into sandwich-type superlattices via layer-by-layer transfer, in which ABA–COF superlattice stacking into a “nano-hourglass” steric configuration that can accelerate the dynamic charge transportation/accumulation and promote the sufficient redox reactions to energy storage. The fabricated flexible MSC–ABA–COF exhibits the highest intrinsic CV of 927.9 F cm−3 at 10 mV s−1 than reported two-dimensional alloy, graphite-like carbon and undoped COF-based MSC devices so far, and shows a bending-resistant energy density of 63.2 mWh cm−3 even after high-angle and repeat arbitrary bending from 0 to 180°. This work provides a feasible way to meet the demand for future miniaturization and wearable electronics.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bending Resistance Covalent Organic Framework Superlattice: “Nano-Hourglass”-Induced Charge Accumulation for Flexible In-Plane Micro-Supercapacitors

Zhang

Xiong

et al. 2022

Nano-Micro Lett.

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Section: Cof-based Hybrid Materialsmentioning

confidence: 99%

Covalent Organic Frameworks for Capacitive Energy Storage: Recent Progress and Technological Challenges

Wang

Chen

et al. 2023

Adv Materials Technologies

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In principle, supercapacitors may store electrical energy through the electrical double-layer capacitance (EDLC), pseudocapacitance, or a mix of the above two. [3f ] EDLC stems from the electrostatically reversible electrolyte ion adsorption and desorption on electrode surfaces. [4] Therefore, electrodes with a large specific surface area and good electrical conductivity are essential to obtain a high EDLC. Carbon materials, such as activated carbon, [5] graphene, [6] and carbon nanotubes (CNTs), [7] are common EDLC materials due to their large specific surface area, high electrical conductivity, good cycling stability, and reasonably low cost. On the other hand, pseudocapacitance originates from rapid and reversible Faradaic reactions occurring on the surfaces of redox-active electrodes. [8] Common pseudocapacitive materials include transition metal oxides and conducting polymers. [9] Further, asymmetric hybrid capacitors combine electrodes with EDLC and pseudocapacitance to obtain broader operating potential windows and substantially higher energy density. [10] The properties of capacitive electrode materials govern the energy storage performance of supercapacitors. Extensive research efforts have been devoted to developing novel capacitive materials. These efforts have focused on two main strategies: 1) increasing the ion-accessible surface area of capacitive materials and 2) incorporating redox-active species to increase pseudocapacitance, achieving significant progress. For instance, a 3D graphene framework prepared by thermal decomposition exhibited a large specific surface area of 1018 m 2 g −1 and a high specific capacitance of 266 F g −1 at a current density of 0.5 A g −1 . [11] A nanoporous carbon sphere with an exceptional specific surface area of 3357 m 2 g −1 showed a specific capacitance of 405 F g −1 at 0.5 A g −1 . [12] Many studies have optimized the crystallinity, pore structure, and redox-active species of metal oxides/hydroxides and polymeric materials. [13] However, irregular pore structures, low electrical conductivity, uneven distribution of redox-active species in capacitive materials, and uncontrollable agglomeration of their nanoparticles often increase the mass transfer resistance of electrolyte ions and reduce their accessible surface areas, resulting in deteriorated energy storage performance. Further, metal dissolution and crystal structure transformation of metal oxides/hydroxides and fast degradation of polymeric materials also shorten the cycling life of supercapacitors fabricated using these materials. [14] Therefore, developing novel capacitive materials with Covalent-organic frameworks (COFs) are emerging organic crystalline materials with a porous framework that extends into two or three dimensions. Originating from their versatile and rigorous synthesis conditions, COFs have abundant and tunable pores, large and easily accessible surfaces, and plenty of redox-active sites, making them promising material candidates for various energy storage applications. One important area...

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“…Covalent organic frameworks (COFs) are an emerging class of porous crystalline organic polymers constructed from the covalent linkage of geometrically predefined organic building blocks into extended 2D or 3D networks. [23][24][25][26][27][28][29] As a consequence of the ordered pores that favor the transport of K + and highly aggregated structure that can largely prevent their dissolution in organic electrolytes, COFs have been revealed to exhibit a great application potential as promising electrode material for PIBs. [30][31][32][33][34] However, conventional COFs that are usually connected by imine and boronate ester groups are not able to meet the high requirements of electrode materials with high conductivity and ultrastable structure.…”

Section: Introductionmentioning

confidence: 99%

Ionothermal Synthesis of Fully Conjugated Covalent Organic Frameworks for High‐Capacity and Ultrastable Potassium‐Ion Batteries

et al. 2022

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Fully aromatic conjugated covalent organic frameworks (FAC‐COFs) with excellent physicochemical stability have been emerging as active semiconductors for diverse potential applications. Developing efficient synthesis methods for fabricating FAC‐COFs will significantly facilitate the exploration over their material and photonic/electronic functionalities. Herein, a facile solvent‐free strategy is developed for the synthesis of 2D phthalocyanine‐based FAC‐COFs (FAC‐Pc‐COFs). Cyclopolymerization of benzo[1,2‐b:4,5‐b′]bis[1,4]benzodioxin‐2,3,9,10‐tetracarbonitrile (BBTC) and quinoxalino[2′,3′:9,10]phenanthro[4,5‐abc]phenazine‐6,7,15,16‐tetracarbonitrile (QPPTC) in ZnCl2 leads to the fast formation and isolation of BB‐FAC‐Pc‐COF and QPP‐FAC‐Pc‐COF, respectively. Powder X‐ray diffraction and electron microscopy analysis reveal their crystalline nature with sql topology and AA stacking configuration. Thermogravimetric analysis and immersion experiment indicate their excellent stability. The conductivity test demonstrates their high conductivity of 0.93–1.94 × 10−4 S cm−1 owing to the fully π‐conjugated electronic structural nature. In particular, the as‐prepared FAC‐Pc‐COFs show high‐performance K+ storage in potassium‐ion batteries due to their excellent conductivity, highly ordered and robust structure, and N/O‐rich framework nature. Impressively, QPP‐FAC‐Pc‐COF shows a large reversible capacity of 424 mA h g−1 after 100 cycles at 50 mA g−1 and a capacity retention of nearly 100% at 2000 mA g−1 for over 10 000 cycles.

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Carbon-based elastic foams supported redox-active covalent organic frameworks for flexible supercapacitors

Cited by 35 publications

References 50 publications

Bending Resistance Covalent Organic Framework Superlattice: “Nano-Hourglass”-Induced Charge Accumulation for Flexible In-Plane Micro-Supercapacitors

Bending Resistance Covalent Organic Framework Superlattice: “Nano-Hourglass”-Induced Charge Accumulation for Flexible In-Plane Micro-Supercapacitors

Covalent Organic Frameworks for Capacitive Energy Storage: Recent Progress and Technological Challenges

Ionothermal Synthesis of Fully Conjugated Covalent Organic Frameworks for High‐Capacity and Ultrastable Potassium‐Ion Batteries

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