Tight Covalent Organic Framework Membranes for Efficient Anion Transport via Molecular Precursor Engineering

Kong, Yan; He, Xueyi; Wu, Hong; Yang, Yi; Cao, Li; Li, Runlai; Shi, Benbing; He, Guangwei; Liu, Yiqin; Quan, Peng; Fan, Chunyang; Zhang, Zhenjie; Jiang, Zhongyi

doi:10.1002/anie.202105190

Cited by 65 publications

(28 citation statements)

References 61 publications

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“…[14][15][16][17][18] Such stable pore channels are of great interest for nanofluidic ion transport. [19][20][21][22][23][24][25] Nevertheless, the real solid-state ion conduction is far from a practical requirement, [15] even with the most attractive SIC-type COFs (Figure 1c). This is because in the solid state, diffusion of closely associated Li ions occurs mainly along the pore walls of lithiated COFs (Figure 1f).…”

Section: Doi: 101002/adma202201410mentioning

confidence: 99%

Foldable Solid‐State Batteries Enabled by Electrolyte Mediation in Covalent Organic Frameworks

et al. 2022

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Solid‐state electrolytes with high Li+ conductivity, flexibility, durability, and stability offer an attractive solution to enhance safety and energy density. However, meeting these stringent requirements poses challenges to the existing solid polymeric or ceramic electrolytes. Here, an electrolyte‐mediated single‐Li+‐conductive covalent organic framework (COF) is presented, which represents a new category of quality solid‐state Li+ conductors. In situ solidification of a tailored liquid electrolyte boosts the charge‐carrier concentration in the COF channels, decouples Li+ cations from both COF walls and molecular chains, and eliminates defects by crystal soldering. Such an altered microenvironment activates the motion of Li+ ions in a directional manner, which leads to an increase in Li+ conductivity by 100 times with a transference number of 0.85 achieved at room temperature. Moreover, the electrolyte conversion cements the ultrathin COF membrane with fortified mechanical toughness. With the COF membrane, foldable solid‐state pouch cells are demonstrated.

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Section: Doi: 101002/adma202201410mentioning

confidence: 99%

Foldable Solid‐State Batteries Enabled by Electrolyte Mediation in Covalent Organic Frameworks

et al. 2022

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“…It was found that the smaller and more hydrophilic aldehyde monomers helped to promote the interfacial reaction‐diffusion process, allowing for the controlled assembly of COF‐QA membranes with a tighter structure, which would result in a fast anion diffusion rate. [ 117 ]…”

Section: Separation Applications Of 2d Polymer Nanosheets‐based Membr...mentioning

confidence: 99%

2D Polymer Nanosheets for Membrane Separation

et al. 2022

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Since the discovery of single-layer graphene in 2004, the family of 2D inorganic nanosheets is considered as ideal membrane materials due to their ultrathin atomic thickness and fascinating physicochemical properties. However, the intrinsically nonporous feature of 2D inorganic nanosheets hinders their potential to achieve a higher flux to some extent. Recently, 2D polymer nanosheets, originated from the regular and periodic covalent connection of the building units in 2D plane, have emerged as promising candidates for preparing ultrafast and highly selective membranes owing to their inherently tunable and ordered pore structure, light weight, and high specific surface. In this review, the synthetic methodologies (including top-down and bottom-up methods) of 2D polymer nanosheets are first introduced, followed by the summary of 2D polymer nanosheets-based membrane fabrication as well as membrane applications in the fields of gas separation, water purification, organic solvent separation, and ion exchange/transport in fuel cells and lithium-sulfur batteries. Finally, based on their current achievements, the authors' personal insights are put forward into the existing challenges and future research directions of 2D polymer nanosheets for membrane separation. The authors believe this comprehensive review on 2D polymer nanosheets-based membrane separation will definitely inspire more studies in this field.

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“…Furthermore, a single fuel cell containing quaternized iCOFs as an anion-exchange membrane showed a peak power density of 163.7 mW cm −2 and an open-circuit voltage of 0.989 V. The same research group also fabricated a quaternary ammonium-functionalized COF via an interfacial method, and this iCOF exhibited a high OH − conductivity (200 mS cm −1 ) at 80 °C and 100% RH due to its tightly structured membrane. [323] Tao et al recently used a similar approach to postfunctionalize COFs by grafting imidazolium termini onto their pore walls; this yielded a species with an OH − conductivity of 153 mS cm −1 at 80 °C. [324] As has been illustrated above, most ion-conduction mechanisms involve the hopping of counterions.…”

Section: Cationic Cofs For Energy Devicesmentioning

confidence: 99%

Ionic Covalent Organic Frameworks for Energy Devices

et al. 2021

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Covalent organic frameworks (COFs) are a class of porous crystalline materials whose facile preparation, functionality, and modularity have led to their becoming powerful platforms for the development of molecular devices in many fields of (bio)engineering, such as energy storage, environmental remediation, drug delivery, and catalysis. In particular, ionic COFs (iCOFs) are highly useful for constructing energy devices, as their ionic functional groups can transport ions efficiently, and the nonlabile and highly ordered all‐covalent pore structures of their backbones provide ideal pathways for long‐term ionic transport under harsh electrochemical conditions. Here, current research progress on the use of iCOFs for energy devices, specifically lithium‐based batteries and fuel cells, is reviewed in terms of iCOF backbone‐design strategies, synthetic approaches, properties, engineering techniques, and applications. iCOFs are categorized as anionic COFs or cationic COFs, and how each of these types of iCOFs transport lithium ions, protons, or hydroxides is illustrated. Finally, the current challenges to and future opportunities for the utilization of iCOFs in energy devices are described. This review will therefore serve as a useful reference on state‐of‐the‐art iCOF design and application strategies focusing on energy devices.

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Tight Covalent Organic Framework Membranes for Efficient Anion Transport via Molecular Precursor Engineering

Cited by 65 publications

References 61 publications

Foldable Solid‐State Batteries Enabled by Electrolyte Mediation in Covalent Organic Frameworks

Foldable Solid‐State Batteries Enabled by Electrolyte Mediation in Covalent Organic Frameworks

2D Polymer Nanosheets for Membrane Separation

Ionic Covalent Organic Frameworks for Energy Devices

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