Dual-sided symmetric crystalline orientation of covalent organic framework membranes for unidirectional anhydrous proton conduction

Liu, Shujing; Lin, Zheng; Wang, Changchun

doi:10.1007/s11426-022-1379-y

Cited by 11 publications

(8 citation statements)

References 37 publications

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“…There are several reports on proton conductive COF membranes recently which exhibited the advantage of direct usage in PEMFCs. Guo et al developed an interfacial polymerization approach . COF membranes formed in the interface of the water/oil system.…”

Section: Proton Conductive Cof Membranesmentioning

confidence: 99%

“…FE SEM images for the evolution of the TAPB-DMTP-COF0.1-BBA membrane at 2 (b), 4 (c), 12 (d), 24 (e), 30 (f), and 48 h (g), respectively (color online). Reproduced or adapted with permission from ref . Copyright 2022 Springer.…”

Section: Proton Conductive Cof Membranesmentioning

confidence: 99%

“…Guo et al developed an interfacial polymerization approach. 115 COF membranes formed in the interface of the water/oil system. TAPB and PTSA diffused slowly from the aqueous to organic phase to react with DMTP in the organic phase, forming a 2D COF at the water/oil interface.…”

Section: ■ Proton Conductive Cof Membranesmentioning

confidence: 99%

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Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

et al. 2023

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Proton exchange membranes (PEMs), especially for work under intermediate temperatures (100–200 °C), have attracted great interest because of the high CO toleration and facial water management of the corresponding proton exchange membrane fuel cells (PEMFCs). Traditional polymer PEMs faced challenges of low stability and proton carrier leaking. Crystalline porous materials, such as metal–organic frameworks (MOFs) and covalent organic frameworks (COFs), are promising to overcome these issues contributed by nanometer-sized channels. Herein we summarized the recent development of MOF/COF-based intermediate-temperature proton conductors. The strategies of framework engineering and pore impregnation were introduced in detail for raising proton conductivity. The proton-conducting mechanism was described as well. This spotlight will provide new insight into the fabrication of MOF/COF proton conductors under intermediate-temperature and anhydrous conditions.

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Section: Proton Conductive Cof Membranesmentioning

confidence: 99%

Section: Proton Conductive Cof Membranesmentioning

confidence: 99%

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Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

et al. 2023

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“…The FT-IR spectrum of COF 1 displays a characteristic −CN stretch at 1620 cm –1 , confirming the formation of imine groups (Figures b and S1). Notably, the sharp −CHO signal at 1697 cm –1 was retained after the formation of COF 1, indicating the retention of aldehyde groups on the TpTTc component (Figures b and S1). The solid-state 13 C cross-polarization magic-angle spinning (CP-MAS) NMR spectrum of COF 1 showed a −CHO signal at 194.6 ppm, consistent with the FT-IR results (Figure c) .…”

Section: Resultsmentioning

confidence: 97%

Pore Space Partition Synthetic Strategy in Imine-linked Multivariate Covalent Organic Frameworks

Hao,

Xie,

Lei

et al. 2023

J. Am. Chem. Soc.

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Partitioning the pores of covalent organic frameworks (COFs) is an attractive strategy for introducing microporosity and achieving new functionality, but it is technically challenging to achieve. Herein, we report a simple strategy for partitioning the micropores/mesopores of multivariate COFs. Our approach relies on the predesign and synthesis of multicomponent COFs through imine condensation reactions with aldehyde groups anchored in the COF pores, followed by inserting additional symmetric building blocks (with C 2 or C 3 symmetries) as pore partition agents. This approach allowed tetragonal or hexagonal pores to be partitioned into two or three smaller micropores, respectively. The synthesized library of pore-partitioned COFs was then applied for the capture of iodine pollutants (i.e., I 2 and CH 3 I). This rich inventory allowed deep exploration of the relationships between the COF adsorbent composition, pore architecture, and adsorption capacity for I 2 and CH 3 I capture under wide-ranging conditions. Notably, one of our developed pore-partitioned COFs (COF 3-2P) exhibited greatly enhanced dynamic I 2 and CH 3 I adsorption performances compared to its parent COF (COF 3) in breakthrough tests, setting a new benchmark for COF-based adsorbents. Results present an effective design strategy toward functional COFs with tunable pore environments, functions, and properties.

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“…Pressing COF powders into pellets for proton conduction has been extensively explored, and its feasibility in PEMFC has also been verified. However, the random arrangement of crystallites in the pressed pellets is not conducive to the construction of ordered proton transfer channels. , Meanwhile, the millimeter-thickness pellets increase the proton transfer resistance, although this is helpful to suppress gas permeation. In this regard, developing self-standing and flexible thin COF-based membranes is highly desirable …”

Section: Proton-conducting Cof Pelletsmentioning

confidence: 99%

Emerging Covalent Organic Frameworks for Efficient Proton Conductors

Zhang,

Lyu,

Gao

et al. 2023

Ind. Eng. Chem. Res.

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Covalent organic frameworks (COFs) are a class of crystalline porous materials with ordered nanochannels, designable functionality, and excellent chemical/thermal stability. Taking advantage of these exceptional properties, COFs have emerged as ideal platforms for designing proton conductors. Since the first successful realization of COFs as proton conductors in 2014, considerable efforts have been devoted to this field. This Review summarizes the evolution of COFs as proton conductors from powder-pressed pellets to self-standing membranes, as well as the properties of these proton-conducting COFs. Finally, current challenges and prospects for COFs in the field of proton conductors are discussed.

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Dual-sided symmetric crystalline orientation of covalent organic framework membranes for unidirectional anhydrous proton conduction

Cited by 11 publications

References 37 publications

Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

Recent Progress of Crystalline Porous Frameworks for Intermediate-Temperature Proton Conduction

Pore Space Partition Synthetic Strategy in Imine-linked Multivariate Covalent Organic Frameworks

Emerging Covalent Organic Frameworks for Efficient Proton Conductors

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