Interlayer Hydrogen-Bonded Covalent Organic Frameworks as High-Performance Supercapacitors

Halder, Arjun; Ghosh, Meena; M, Abdul Khayum; Bera, Saibal; Addicoat, Matthew A.; Sasmal, Himadri Sekhar; Karak, Suvendu; Kurungot, Sreekumar; Banerjee, Rahul

doi:10.1021/jacs.8b06460

Cited by 367 publications

(302 citation statements)

References 32 publications

(12 reference statements)

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“…Because of the strong π–π interaction between COFs layers, the yield of 2D COFs by these methods is often low. Banerjee et al and Peng et al destroyed the interlayer π–π interaction by introducing flexible structural elements into COF backbone, which made the exfoliation easier …”

Section: Classification Of 2d Crystalsmentioning

confidence: 99%

2D Crystal–Based Fibers: Status and Challenges

Meng

Kong

et al. 2019

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2D crystals are emerging new materials in multidisciplinary fields including condensed state physics, electronics, energy, environmental engineering, and biomedicine. To employ 2D crystals for practical applications, these nanoscale crystals need to be processed into macroscale materials, such as suspensions, fibers, films, and 3D macrostructures. Among these macromaterials, fibers are flexible, knittable, and easy to use, which can fully reflect the advantages of the structure and properties of 2D crystals. Therefore, the fabrication and application of 2D crystal–based fibers is of great importance for expanding the impact of 2D crystals. In this Review, 2D crystals that are successfully prepared are overviewed based on their composition of elements. Subsequently, methods for preparing 2D crystals, 2D crystals dispersions, and 2D crystal–based fibers are systematically introduced. Then, the applications of 2D crystal–based fibers, such as flexible electronic devices, high‐efficiency catalysis, and adsorption, are also discussed. Finally, the status‐of‐quo, perspectives, and future challenges of 2D crystal–based fibers are summarized. This Review provides directions and guidelines for developing new 2D crystal–based fibers and exploring their potentials in the fields of smart wearable devices.

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Section: Classification Of 2d Crystalsmentioning

confidence: 99%

2D Crystal–Based Fibers: Status and Challenges

Meng

Kong

et al. 2019

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“…The TpPa‐(OH) 2 COF (Figure j) with hydroxy groups to protect the benzoquinone moieties from decomposition during charge and discharge processes achieves a capacity of 416 F g −1 at 0.5 A g −1 with 43 % accessibility of the quinone units . The TpOMe‐DAQ COF (Figure k) with intralayer hydrogen‐bonding interactions exhibits a capacitance of 169 F g −1 in H 2 SO 4 (3 m ) . Integrating π‐electron‐rich moieties such as 2,6‐diaminoanthracene as well as redox‐active anthraquinone into COFs improved the mechanical strength of the resulting Dq 1 Da 1 Tp COF (Figure l).…”

Section: Built‐in Functionsmentioning

confidence: 99%

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

et al. 2019

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A new approach has been developed to design organic polymers using topology diagrams. This strategy enables covalent integration of organic units into ordered topologies and creates a new polymer form, that is, covalent organic frameworks. This is a breakthrough in chemistry because it sets a molecular platform for synthesizing polymers with predesignable primary and high‐order structures, which has been a central aim for over a century but unattainable with traditional design principles. This new field has its own features that are distinct from conventional polymers. This Review summarizes the fundamentals as well as major progress by focusing on the chemistry used to design structures, including the principles, synthetic strategies, and control methods. We scrutinize built‐in functions that are specific to the structures by revealing various interplays and mechanisms involved in the expression of function. We propose major fundamental issues to be addressed in chemistry as well as future directions from physics, materials, and application perspectives.

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“…For one important reason, the imine groups (C=N) participate in the process of lithium‐storage as the anode materials for LIBs . Besides, imine‐based COFs exhibit good intrinsic conductivity and chemical stability in organic solutions owing to their two‐ or three‐dimensional π‐conjugated backbones, where a large π‐conjugated system and planar structure may lower local energy level greatly, and strengthen the chemical stability of COFs …”

Section: Figurementioning

confidence: 99%

Two π‐Conjugated Covalent Organic Frameworks with Long‐Term Cyclability at High Current Density for Lithium Ion Battery

Chen

Cao

et al. 2019

Chemistry A European J

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Organicl ithiumi on batteries (LIBs) are considered as one of the next-generation green electrochemical energy storage( EES) devices.H owever,o btaining both high capacity and long-term cyclability is still the bottleneck of organice lectrode materials for LIBs because of weak structural and chemical stability and low conductivity.C ovalento rganic frameworks (COFs) show potential to overcome these problemso wing to its good stabilitya nd high capacity.Herein, the synthesis andc haracterization of two p-conjugated COFs, derived from the Schiff-base reaction of 2,4,6-triaminopyrimidne (TM) respectively with 1,4phthalaldehyde (PA) and1 ,3,5-triformylbenzene( TB) by a mechanochemical process are presented. As anode materials for LIBs, the COFs exhibit favorable electrochemical performance with the highest reversibled ischarge capacities of up to 401.3 and 379.1 mAh g À1 at ah igh current density (1 Ag À1 ), respectively,a nd excellent long-term cyclability with 74.8 and 72.7 %c apacity retention after 2000 cycles compared to the initial discharge capacities.

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Interlayer Hydrogen-Bonded Covalent Organic Frameworks as High-Performance Supercapacitors

Cited by 367 publications

References 32 publications

2D Crystal–Based Fibers: Status and Challenges

2D Crystal–Based Fibers: Status and Challenges

Covalent Organic Frameworks: Chemical Approaches to Designer Structures and Built‐In Functions

Two π‐Conjugated Covalent Organic Frameworks with Long‐Term Cyclability at High Current Density for Lithium Ion Battery

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