Pore-in-Pore Engineering in a Covalent Organic Framework Membrane for Gas Separation DOI Creative Commons
Hongwei Fan, Haoran Wang,

Manhua Peng

et al.

ACS Nano, Journal Year: 2023, Volume and Issue: 17(8), P. 7584 - 7594

Published: April 7, 2023

Covalent organic framework (COF) membranes have emerged as a promising candidate for energy-efficient separations, but the angstrom-precision control of channel size in subnanometer region remains challenge that has so far restricted their potential gas separation. Herein, we report an ultramicropore-in-nanopore concept engineering matreshka-like pore-channels inside COF membrane. In this concept, α-cyclodextrin (α-CD) is situ encapsulated during interfacial polymerization which presumably results linear assembly (LA) α-CDs 1D nanochannels COF. The LA-α-CD-in-TpPa-1 membrane shows high H2 permeance (∼3000 GPU) together with enhanced selectivity (>30) over CO2 and CH4 due to formation fast selective H2-transport pathways. overall performance H2/CO2 H2/CH4 separation transcends Robeson upper bounds ranks among most powerful H2-selective membranes. versatility strategy demonstrated by synthesizing different types LA-α-CD-in-COF

Language: Английский

Covalent organic frameworks: an ideal platform for designing ordered materials and advanced applications DOI Open Access
Ruoyang Liu, Ke Tian Tan, Yifan Gong

et al.

Chemical Society Reviews, Journal Year: 2020, Volume and Issue: 50(1), P. 120 - 242

Published: Dec. 7, 2020

Covalent organic frameworks offer a molecular platform for integrating units into periodically ordered yet extended 2D and 3D polymers to create topologically well-defined polygonal lattices built-in discrete micropores and/or mesopores.

Language: Английский

Citations

746
Metal–organic frameworks and covalent organic frameworks as disruptive membrane materials for energy-efficient gas separation DOI
Alexander Knebel, J. Caro

Nature Nanotechnology, Journal Year: 2022, Volume and Issue: 17(9), P. 911 - 923

Published: Aug. 22, 2022

Language: Английский

Citations

326
MOF-in-COF molecular sieving membrane for selective hydrogen separation DOI Creative Commons
Hongwei Fan,

Manhua Peng,

Ina Strauß

et al.

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Jan. 4, 2021

Abstract Covalent organic frameworks (COFs) are promising materials for advanced molecular-separation membranes, but their wide nanometer-sized pores prevent selective gas separation through molecular sieving. Herein, we propose a MOF-in-COF concept the confined growth of metal-organic framework (MOFs) inside supported COF layer to prepare membranes. These membranes feature unique micro/nanopore network, presumably due formation MOFs as pearl string-like chain unit cells in 1D channel 2D COFs. The exhibit an excellent hydrogen permeance (>3000 GPU) together with significant enhancement selectivity over other gases. superior performance H 2 /CO and /CH 4 surpasses Robeson upper bounds, benefiting from synergy combining precise size sieving fast transport channels. synthesis different combinations COFs robust demonstrates versatility our design strategy.

Language: Английский

Citations

320
Microporous framework membranes for precise molecule/ion separations DOI
Haozhen Dou,

Mi Xu,

Baoyu Wang

et al.

Chemical Society Reviews, Journal Year: 2020, Volume and Issue: 50(2), P. 986 - 1029

Published: Nov. 23, 2020

Microporous framework membranes with well-defined micropore structure such as metal-organic and covalent organic hold great promise for the enormous challenging separations in energy environment fields.

Language: Английский

Citations

273
Organic molecular sieve membranes for chemical separations DOI
Hongjian Wang, Meidi Wang, Xu Liang

et al.

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(9), P. 5468 - 5516

Published: Jan. 1, 2021

This review proposes the concept of organic molecular sieve membranes (OMSMs) and guiding principles for precise structure construction efficient process intensification OMSMs.

Language: Английский

Citations

259
Perfluoroalkyl-Functionalized Covalent Organic Frameworks with Superhydrophobicity for Anhydrous Proton Conduction DOI
Xiaowei Wu, You‐lee Hong, Bingqing Xu

et al.

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 142(33), P. 14357 - 14364

Published: July 25, 2020

The development of anhydrous proton-conducting materials is critical for the fabrication high-temperature (>100 °C) polymer electrolyte membrane fuel cells (HT-PEMFCs) and remains a significant challenge. Covalent organic frameworks (COFs) are an emerging class porous crystalline with tailor-made nanochannels hold great potential ion molecule transport, but their poor chemical stability poses challenges in this respect. In contribution, we present bottom-up self-assembly strategy to construct perfluoroalkyl-functionalized hydrazone-linked 2D COFs systematically investigate effect different lengths fluorine chains on acid proton conductivity. Compared nonfluorous parent COFs, fluorinated possess structural ultrastability toward strong acids as result enhanced hydrophobicity (water contact angle 144°). Furthermore, superhydrophobic 1D can serve robust hosts accommodate large amounts phosphonic fast long-term conduction under conditions wide temperature range. conductivity 4.2 × 10-2 S cm-1 at 140 °C after H3PO4 doping, which 4 orders magnitude higher than counterparts among highest values doped so far. Solid-state NMR studies revealed that forms hydrogen-boding networks perfluoroalkyl most molecules highly dynamic mobile while rigid, affords rapid transport. This work paves way realization target properties through predesign functionalization pore surface highlights COF rigid platform transportation.

Language: Английский

Citations

230
Three-Dimensional Covalent Organic Frameworks: From Topology Design to Applications DOI
Bo Gui,

Guiqing Lin,

Huimin Ding

et al.

Accounts of Chemical Research, Journal Year: 2020, Volume and Issue: 53(10), P. 2225 - 2234

Published: Sept. 8, 2020

ConspectusCovalent organic frameworks (COFs) represent a novel type of crystalline porous polymers with potential applications in many areas. Considering their covalent connectivity different dimensions, COFs are classified as two-dimensional (2D) layered structures or three-dimensional (3D) networks. In particular, 3D have gained increasing attention recently because remarkably large surface areas (>5000 m2/g), hierarchical nanopores and numerous open sites. However, it has been proven to be major challenge construct COFs, the main driving force for synthesis comes from formation bonds. addition, there several stones on roads blocking development COFs. First, successful topology design strategies limited [4 + 2] 3] condensation reactions tetrahedral molecules linear triangular building blocks first decade, which led only three available topologies (ctn, bor, dia) strongly restricted incorporation some important functional units. Next, is very challenging obtain large-size single crystals same may yield possible that quite difficult identify simulations, structure determination considered issue. Last, utilized synthesize limited, further affects functionalization applications. Therefore, since was announced 2007, research studies regarding underexplored years, few examples reported.To confront these obstacles we started contributing this field 2016. interesting quadrilateral (e.g., pyrene porphyrin) cannot easily derivatized into motifs, developed strategy via 4] blocks. After trials, found general synthetic build new pts topology. explored polycrystalline prepared by our electron diffraction technique. Moreover, expanded toolbox molecular creating successfully demonstrated characteristic properties Account, summarize above ongoing contributions, including (i) COFs; (ii) attempts determine crystal atomic resolution; (iii) diversification functionalized Overall, not offer paradigm expansion block families but also provide an idea future opportunities relevant researchers field.

Language: Английский

Citations

216
Metalated covalent organic frameworks: from synthetic strategies to diverse applications DOI
Qun Guan, Lele Zhou, Yu‐Bin Dong

et al.

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 51(15), P. 6307 - 6416

Published: Jan. 1, 2022

This review highlights the recent advances of metalated covalent organic frameworks, including synthetic strategies and applications, discusses current challenges future directions.

Language: Английский

Citations

215
Recent Progress in External‐Stimulus‐Responsive 2D Covalent Organic Frameworks DOI
Pengfei She,

Yanyan Qin,

Xiang Wang

et al.

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(22)

Published: July 8, 2021

Recently, smart 2D covalent organic frameworks (COFs), combining the advantages of both inherent structure features and functional building blocks, have been demonstrated to show reversible changes in conformation, color, luminescence response external stimuli. This review provides a summary on recent progress COFs that are responsive stimuli such as metal ions, gas molecules, pH values, temperature, electricity, light, etc. Moreover, mechanisms design strategies, along with applications these stimulus-responsive chemical sensors photoelectronic devices also discussed. It is believed this would provide some guidelines for designing novel single-/multistimulus-responsive controllable behaviors advanced applications.

Language: Английский

Citations

213
Ultrathin Covalent Organic Framework Membranes via a Multi‐Interfacial Engineering Strategy for Gas Separation DOI
Yunpan Ying, Shing Bo Peh, Hao Yang

et al.

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(25)

Published: Sept. 17, 2021

Covalent organic frameworks (COFs) are promising membrane materials due to their high porosity, ordered arrangements, and stability. However, the relatively large pore size complicated preparation processes of COFs limit applications in sieving small gas molecules, even at a lab scale. Herein, multi-interfacial engineering strategy is proposed, that is, direct layer-by-layer interfacial reaction two (TpPa-SO3 H TpTGCl ) with different sizes form narrowed apertures COF-COF interfaces atop large-pore COF (COF-LZU1) film. At 423 K, one fabricated 155 nm-thick ultrathin displays H2 permeance as 2163 permeation units (GPU) /CO2 selectivity 26, transcending 2008 Robeson upper bound. This not only provides high-performance candidates for separation, but also enlightens manipulation other COFs, porous polymers, membranes.

Language: Английский

Citations

193