Expanding the dimensionality of proton conduction enables ultrahigh anhydrous proton conductivity of phosphoric acid-doped covalent-organic frameworks

Yang, Qianqian; Li, Xinyu; Xie, Changsong; Liu, Ning; Yang, Jianjian; Kong, Zhihui; Kang, Zixi; Wang, Rongming; Li, Xiyou; Sun, Daofeng

doi:10.1007/s12274-023-5812-x

Cited by 8 publications

(3 citation statements)

References 58 publications

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“…It is essential for developing proton conducting materials in fuel batteries. [74] In this regard, Wu et al constructed three hydrazone-linked COFs (i.e., COF-F6, COF-F8 and COF-F10) and explored their performances with varying fluorine chains. [75] Notably, compared to their nonfluorous counterparts, fluorinated COFs exhibited a high proton conductivity (4.2×10 À 2 S cm À 1 at 140 °C) with the doping of H 3 PO 4 owing to the superhydrophobic channels could act as a scaffold to encapsulate numerous phosphonic acid for high-performance proton conduction.…”

Section: Energy Storagementioning

confidence: 99%

Hydrazone‐Linked Covalent Organic Frameworks

Zhuang,

Guo,

Huang

et al. 2024

Angewandte Chemie

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Hydrazone‐linked covalent organic frameworks (COFs) with structural flexibility, heteroatomic sites, post‐modification ability and high hydrolytic stability have attracted great attention from scientific community. Hydrazone‐linked COFs, as a subclass of Schiff‐base COFs, was firstly reported in 2011 by Yaghi’s group and later witnessed prosperous development in various aspects. Their adjustable structures, precise pore channels and plentiful heteroatomic sites of hydrazone‐linked structures possess much potential in diverse applications, for example, adsorption/separation, chemical sensing, catalysis and energy storage, etc. Up to date, the systematic reviews about the reported hydrazone‐linked COFs are still rare. Therefore, in this review, we will summarize their preparation methods, characteristics and related applications, and discuss the opportunity or challenge of hydrazone‐linked COFs. We hope this review could provide new insights about hydrazone‐linked COFs for exploring more appealing functions or applications.

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Section: Energy Storagementioning

confidence: 99%

Hydrazone‐Linked Covalent Organic Frameworks

Zhuang,

Guo,

Huang

et al. 2024

Angewandte Chemie

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“…This is because of the shrinkage of the transport channels due to the dehydration of the polymer membrane caused by the reduced humidity, which severely decreases the transport rate. [9][10][11] Therefore, the design and development of efficient and adaptable proton conducting materials are highly demanded.…”

Section: Introductionmentioning

confidence: 99%

Continuous Ultrathin Zwitterionic Covalent Organic Framework Membrane Via Surface‐Initiated Polymerization Toward Superior Water Retention

Liu,

Ma,

et al. 2023

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Efficient construction of proton transport channels in proton exchange membranes maintaining conductivity under varied humidity is critical for the development of fuel cells. Covalent organic frameworks (COFs) hold great potential in providing precise and fast ion transport channels. However, the preparation of continuous free‐standing COF membranes retaining their inherent structural advantages to realize excellent proton conduction performance is a major challenge. Herein, a zwitterionic COF material bearing positive ammonium ions and negative sulphonic acid ions is developed. Free‐standing COF membrane with adjustable thickness is constructed via surface‐initiated polymerization of COF monomers. The porosity, continuity, and stability of the membranes are demonstrated via the transmission electron microscopy (TEM), atomic force microscopy (AFM), and scanning electron microscopy (SEM) characterization. The rigidity of the COF structure avoids swelling in aqueous solution, which improves the chemical stability of the proton exchange membranes and improves the performance stability. In the higher humidity range (50–90%), the prepared zwitterionic COF membrane exhibits superior capability in retaining the conductivity compared to COF membrane merely bearing sulphonic acid group. The established strategy shows the potential for the application of zwitterionic COF in the proton exchange membrane fuel cells.

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“…19 In turn, it limits the possibility of further optimization in a rational manner. 20–22 Recently, the application of crystalline materials, such as coordination polymers (CPs), metal–organic frameworks (MOFs), polyoxometalates (POMs) and covalent organic frameworks (COFs), in the field of proton conduction has also received great attention, 11 due to their predesign and post-modification structural characteristics, and the existence of a large amount of H-bonded system in their frameworks. 23,24 In addition, the crystalline properties of crystalline porous materials provide an opportunity for proton conduction pathways and mechanisms, and provide a theoretical basis for the synthesis of new materials.…”

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confidence: 99%