Vapor linker exchange of partially amorphous metal–organic framework membranes for ultra‐selective gas separation

Su, Pengcheng; Tang, Haijie; Jia, Miaomiao; Lin, Yaowang; Li, Wanbin

doi:10.1002/aic.17576

Cited by 22 publications

(16 citation statements)

References 72 publications

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“…The g-C 3 N 4 membrane assembled by the bottom-up g-C 3 N 4 nanosheets exhibits noticeable separation performance while the one using the top-down nanosheets does not, indicating that the defects have a significant adverse effect on membrane performance. Recently, Li et al 40 developed a strategy of vapor linker exchange inducing partial amorphization to conglutinate grain boundary/crack defects of membranes, where the ZIF-8 composite membrane showed competitive H 2 /CO 2 selectivity up to 2400, which also indicated the great significance of restraining membrane defects, further illustrating the advantages of the bottom-up method for the synthesis of g-C 3 N 4 . Gas permeation through the g-C 3 N 4 membrane is different from Knudsen diffusion and is mainly governed by the kinetic gas diameter rather than its molecular weight, known as the size exclusion or molecular sieving mechanism 41 (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Fast hydrogen purification through graphitic carbon nitride nanosheet membranes

Zhou

et al. 2022

Nat Commun

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Two-dimensional graphitic carbon nitride (g-C3N4) nanosheets are ideal candidates for membranes because of their intrinsic in-plane nanopores. However, non-selective defects formed by traditional top-down preparation and the unfavorable re-stacking hinder the application of these nanosheets in gas separation. Herein, we report lamellar g-C3N4 nanosheets as gas separation membranes with a disordered layer-stacking structure based on high quality g-C3N4 nanosheets through bottom-up synthesis. Thanks to fast and highly selective transport through the high-density sieving channels and the interlayer paths, the membranes, superior to state-of-the-art ones, exhibit high H2 permeance of 1.3 × 10−6 mol m−2 s−1 Pa−1 with excellent selectivity for multiple gas mixtures. Notably, these membranes show excellent stability under harsh practice-relevant environments, such as temperature swings, wet atmosphere and long-term operation of more than 200 days. Therefore, such lamellar membranes with high quality g-C3N4 nanosheets hold great promise for gas separation applications.

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Section: Resultsmentioning

confidence: 99%

Fast hydrogen purification through graphitic carbon nitride nanosheet membranes

Zhou

et al. 2022

Nat Commun

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“…The decreased crystallinity of MOFs has been shown to help reduce the crack and grain boundary defects, develop accessible porosity and abundant open active sites. [108][109][110][111] The crystallinity regulation strategy also applies to COFs for fast ionic conduction. However, the crystallinity regulation for COFs is difficult than MOFs mainly due to the strong covalent bond between the building blocks and low reversibility of the bond formation.…”

Section: Crystallinity Regulationmentioning

confidence: 99%

Covalent Organic Framework for Rechargeable Batteries: Mechanisms and Properties of Ionic Conduction

Cao

Wang

et al. 2022

Advanced Energy Materials

112

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The ionic conduction plays an important role in the charging/discharging kinetics in rechargeable batteries, mainly including the steps of diffusion in the electrodes, transport in the electrolytes, and permeation through the electrode/electrolyte interphases. [8][9][10] Generally, the ionic transport is a critical control step in the electrochemical reactions, because it is much slower kinetics than electron transport. [8,11] Thus, regulating the ion-transport behavior is very vital to achieve fast-charging secondary batteries. [6,12] Mechanism exploration and novel material design become two important strategies to tackle the sluggish ionconduction kinetics. [13][14][15][16][17] In the secondary battery, the environment of ionic conduction can be roughly divided into liquid electrolytes and solid conductors. The ionic diffusion in the liquid electrolytes can be very fast. However, the flammability of organic solvents and the instability of salts (such as LiPF 6 ) at elevated temperature limit its commercial application. [18,19] The solid conductor is a safer choice to replace the current liquid electrolyte, but still suffers a serious impediment of low ionic conductivity. [20,21] Recently, covalent organic frameworks (COFs), an emerging type of crystalline porous materials, are considered to be a potential solid conductor. [22,23] Depending on the topological establishment of building blocks, COFs are classified into 2D COFs and 3D COFs. Unless otherwise noted, the COFs in this review specifically refer to 2D COFs. 2D COFs typically crystallize as stacked sheets through the π-π interaction between adjacent monolayers, meanwhile the organic units are connected by the covalent bond to form reticular framework with periodic channel structure. [24][25][26][27] Based on the nature of synthetic reactions, COFs have been synthesized with boroxine, boronate ester, borosilicate, triazine, imine, hydrazone, borazine, imide, spiroborate, amide linkages, etc. [24,25] In addition, based on the symmetry of the monomers, COFs can be designed in various topologies, such as tetragonal, hexagonal, rhombic, and trigonal. [24,25] Over the recent decades, a variety of synthetic approaches have been developed to prepare COFs, such as solvothermal synthesis, microwave synthesis, ionothermal synthesis, mechanochemical synthesis, and interfacial synthesis. [24,25] Among them, the solvothermal synthesis under a sealed vessel with a suitable temperature can produce highly crystalline COFs, but this method always needs a long Ionic conduction plays a critical role in the process of electrode reactions and the charge transfer kinetics in a rechargeable battery. Covalent organic frameworks (COFs) have emerged as an exciting new class of ionic conductors, and have made great progress in terms of their application in rechargeable batteries. The unique features of COFs, such as well-defined directional channels, functional diversity, and structural robustness, endow COF-based conductors with a low ionic diffusion energy barrier and excellent t...

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“…A type of crystalline material named metal–organic frameworks (MOFs) consisting of organic linkers and metal ions with adjustable/uniform pore size and splendid thermal/chemical stability has grasped the researchers' attention 19,20 . In recent years, the application of MOF as membrane material for separation has shown excellent performance, but the ceramic disc is often used as the substrate 21–25 . However, the difficulty of industrial integration of ceramic discs further limits the development of ceramic disc‐supported MOF membranes.…”

Section: Introductionmentioning

confidence: 99%

Fast‐current‐driven synthesis of ultrathin ZIF‐8 membrane on ceramic tube for propene/propane separation

et al. 2022

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MOF membranes are very promising in molecular separation, but it is still a challenge for industrial applications due to the complex and time-consuming synthesis. We use the fast current-driven synthesis (FCDS) method to achieve controlled growth of ZIF-8 membranes on porous graphite-coated ceramic tubes by controlling the growth time and current density. Grown for 30 min at a current density of 0.74 mA/cm 2 , the

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Vapor linker exchange of partially amorphous metal–organic framework membranes for ultra‐selective gas separation

Cited by 22 publications

References 72 publications

Fast hydrogen purification through graphitic carbon nitride nanosheet membranes

Fast hydrogen purification through graphitic carbon nitride nanosheet membranes

Covalent Organic Framework for Rechargeable Batteries: Mechanisms and Properties of Ionic Conduction

Fast‐current‐driven synthesis of ultrathin ZIF‐8 membrane on ceramic tube for propene/propane separation

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