Highly hydroxide-conducting hybrid anion exchange membrane with functional COF-enhanced ion nanochannels

Chen, Jia; Li, Ping; Zhang, Ningxin; Tang, Shaokun

doi:10.1016/j.electacta.2021.138962

Cited by 12 publications

(2 citation statements)

References 48 publications

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“…As shown in Figure 1a, the presence of C and N peaks indicates the successful formation of SAM−NH 2 . After the conversion to Br‐terminated SAM (SAM−Br), a peak at 69 eV assigned to Br 3d appears, verifying the successful reaction of 4‐bromobenzyl bromide with the amino group on the silicon substrate [12a,19] . Meanwhile, by comparing the static water contact angle (CA) of the substrates before and after the SAM modification, one can clearly observe the changes in CAs as shown Figure 1b.…”

Section: Resultsmentioning

confidence: 69%

Ultrathin Free‐Standing Porous Aromatic Framework Membranes for Efficient Anion Transport

Du,

Liu,

Yin

et al. 2024

Angew Chem Int Ed

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Porous aromatic frameworks (PAFs) show promising potential in anionic conduction due to their high stability and customizable functionality. However, the insolubility of most PAFs presents a significant challenge in their processing into membranes and subsequent applications. In this study, continuous PAF membranes with adjustable thickness were successfully created using liquid‐solid interfacial polymerization. The rigid backbone and the stable C−C coupling endow PAF membrane with superior chemical and dimensional stabilities over most conventional polymer membranes. Different quaternary ammonium functionalities were anchored to the backbone through flexible alkyl chains with tunable length. The optimal PAF membrane exhibited an OH‐ conductivity of 356.6 mS∙cm‐1 at 80 °C and 98% relative humidity. Additionally, the PAF membrane exhibited outstanding alkaline stability, retaining 95% of its OH− conductivity after 1000 hours in 1M NaOH. To the best of our knowledge, this is the first application of PAF materials in anion exchange membranes, achieving the highest OH− conductivity and exceptional chemical/dimensional stability. This work provides the possibility for the potential of PAF materials in anionic conductive membranes.

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Section: Resultsmentioning

confidence: 69%

Ultrathin Free‐Standing Porous Aromatic Framework Membranes for Efficient Anion Transport

Du,

Liu,

Yin

et al. 2024

Angew Chem Int Ed

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show abstract

“…However, low ionic conductivity and poor stability, especially poor chemical stability, have always been the major problems that lie in the way of AEM development. To address the above problems, several strategies have been proposed, including the design of stable cation exchange groups, − alkaline-resistant polymer backbone (e.g., without the benzyl- ether group), − microphase separation, − semi-interpenetrating polymer network (IPN)/IPN structure, cross-linking, − blending, − and hybridization. − Encouraging results have been achieved, for instance, a cross-linked poly(norbornene) PTFE-supported membrane showed a high conductivity of 198 mS cm –1 @80 °C, with no significant decay after 1000 h under 1 mol L –1 KOH at 80 °C . The poly(aryl piperidinium) membrane was prepared by inducing the strong basic piperidinium cationic group onto the rigid hydrophobic aryl backbone without the ether bond, which showed conductivity of 170 mS cm –1 @80 °C and durability of over 2000 h …”

Section: Introductionmentioning

confidence: 99%

Dual-Cation Interpenetrating Polymer Network Anion Exchange Membrane for Fuel Cells and Water Electrolyzers

Zeng

et al. 2022

Macromolecules

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Anion exchange membranes (AEMs) play an important role in many electrochemical devices, such as alkaline AEM fuel cells and water electrolyzers, with the inherent anion transportation functionality. High ionic conductivity and excellent mechanical and chemical stability are indispensable for the development of AEMs. In addition, excellent comprehensive properties such as high mechanical strength and high ionic conductivity acquired simultaneously are quite important for their commercialization. Single-cation interpenetrating polymer network (IPN) AEMs, with their mechanical support phase and ion conduction phase interlaced, have been reported in our previous work and showed the potential for addressing the dilemma of conductivity and strength. To further increase the ion exchange capacity, both the polymer networks are ionized to fabricate a kind of dual-cation IPN membrane in this work. The resultant membrane cPVBMP-3.0 cQPPO shows excellent OH − conductivity (160.5 mS cm −1 at 80 °C) and good mechanical strength (>20 MPa). In a H 2 /air (CO 2 -free) single cell, a high peak power density of 576 mW cm −2 is achieved. In addition, a current density of 210 mA cm −2 at 1.80 V is observed in pure water electrolysis with a membrane electrode assembly electrolyzer.

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Computational Approaches to Alkaline Anion Exchange Membranes

Thomas

2024

Alkaline Anion Exchange Membranes for Fuel Cells

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Highly hydroxide-conducting hybrid anion exchange membrane with functional COF-enhanced ion nanochannels

Cited by 12 publications

References 48 publications

Ultrathin Free‐Standing Porous Aromatic Framework Membranes for Efficient Anion Transport

Ultrathin Free‐Standing Porous Aromatic Framework Membranes for Efficient Anion Transport

Dual-Cation Interpenetrating Polymer Network Anion Exchange Membrane for Fuel Cells and Water Electrolyzers

Computational Approaches to Alkaline Anion Exchange Membranes

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