Hydroxide ion-conducting metal–organic frameworks for anion-exchange membrane applications

Titirici, Maria‐Magdalena; Szilágyi, Petra Ágota

doi:10.1039/d2ma00880g

Cited by 5 publications

(5 citation statements)

References 117 publications

(246 reference statements)

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“…In fact, after the stability testing, we obtain a record-high room temperature OH − conductivity of 21.6 mS cm −1 for a metal–organic framework containing mobile OH − ion. These are preliminary results as the permeability of the porous self-supporting films and their resistance in strong alkaline conditions over time at various potentials should be tested in future studies, nevertheless our results are in line with a recent literature analysis highlighting the effect of processing on both ion conductivity and MOF stability 8 . Given the facile and relatively low-cost procedure, these remarkable results will help the rational design of high-ion-conductivity, low-cost, robust and flexible MOF-based fibre mats at room temperature and thus facilitate the penetration of alkaline anion exchange membranes onto the market.…”

Section: Discussionsupporting

confidence: 90%

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Development of a new class of stable and adaptable free-standing fibre mats with high room-temperature hydroxide-ion conductivity

Hérou,

Kasongo-Ntumba,

Periasamy

et al. 2024

Sci Rep

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For alkaline anion-exchange membrane electrolysers and fuel cells to become a technological reality, hydroxide-ion (OH−) conducting membranes that are flexible, robust, affording high OH− conductivity, and synthesised in a low-cost and scalable way must be developed. In this paper, we engineer a stable, self-supporting, and flexible fibre mat using a low-cost ZIF-8 metal–organic framework composited with ionic liquid tetrabutylammonium hydroxide and widely used polyacrylonitrile as polymeric backbone. We obtain mats with a high intrinsic OH− conductivity for a metal–organic framework-based material already at room temperature, without added ion-conductor polymers. This approach will contribute to the development of low-cost and tuneable ion-conducting membranes.

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Section: Discussionsupporting

confidence: 90%

“…Metal–organic frameworks (MOFs) offer several advantages in terms of ion conductivity 8 . Firstly, most of them are electrical insulators, which is an essential property for ion-exchange applications.…”

Section: Introductionmentioning

confidence: 99%

Development of a new class of stable and adaptable free-standing fibre mats with high room-temperature hydroxide-ion conductivity

Hérou,

Kasongo-Ntumba,

Periasamy

et al. 2024

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

“…These are preliminary results as the permeability of the porous self-supporting films and their resistance in strong alkaline conditions over time at various potentials should be tested in future studies, nevertheless our results are in line with a recent literature analysis highlighting the effect of processing on both ion conductivity and MOF stability. 8 Given the facile and relatively low-cost procedure, these remarkable results will help the rational design of high-ion-conductivity, low-cost, robust and flexible MOF-based fibre mats at room temperature and thus facilitate the penetration of alkaline anion exchange membranes onto the market.…”

Section: Discussionmentioning

confidence: 99%

“…6,7 Metal-organic frameworks (MOFs) offer several advantages in terms of ion conductivity. 8 Firstly, most of them are electrical insulators, which is an essential property for ion-exchange applications. Secondly, they are highly porous, which facilitates efficient mass, including ion transport.…”

Section: Introductionmentioning

confidence: 99%

Development of a new class of stable and adaptable free-standing fibre mats with high room-temperature hydroxide-ion conductivity

Szilagyi,

Herou,

Kasongo-Ntumba

et al. 2024

Preprint

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For alkaline anion-exchange membrane electrolysers and fuel cells to become a technological reality, hydroxide-ion (OH-) conducting membranes that are flexible, robust, affording high OH- conductivity, and synthesised in a low-cost and scalable way must be developed. In this paper, we engineer a stable, self-supporting, and flexible fibre mat using a low-cost ZIF-8 metal-organic framework composited with ionic liquid tetrabutylammonium hydroxide and widely used polyacrylonitrile as polymeric backbone. We obtain mats with a high intrinsic OH- conductivity for a metal-organic framework-based material already at room temperature, without added ion-conductor polymers. This approach will contribute to the development of low-cost and tuneable ion-conducting membranes.

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“…1 Although some inorganic materials are intrinsically not good conductors of protons, they can nonetheless be functionalized with such groups. Recent advancements in sophisticated materials, like metal organic frameworks (MOFs), 2 carbon nanotubes (CNTs), and graphene, have increased the possibility of creating unique PC-MMMs with extraordinary performance. Post-synthetic modification for porous platforms can be an innovative approach for fabricating PC-MMMs that can function as the electrolyte in membrane electrode assemblies (MEAs) for fuel cells.…”

Section: Introductionmentioning

confidence: 99%

In Situ Polymerization-Mediated Cross-Linking of the MOF Using Poly(1-vinylimidazole) in SPEEK Fuel Cells

Ray

Samantaray

Negi

2023

ACS Appl. Polym. Mater.

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A unique zirconium-based microporous MOF-808 constructed from Zr6 nodes (Zr6O4(OH)4) and BTC (benzene-1,3,5-tricarboxylic acid) synthesized herein has been further tailored by radical in situ polymerization of 1-vinylimidazole alongside N,N′-methylene-bis(acrylamide) as the cross-linker after their adsorption inside MOF pore channels. The cross-linked architectures were incorporated as fillers at 2 and 4 wt % in sulfonated poly (ether ether ketone) (SPEEK) solution to formulate mixed-matrix composite Proton Exchange Membranes (PEMs). The composite membranes displayed considerably higher proton conductivity, improved fuel cell performance, and thermal stability than pristine SPEEK. The highly ordered crystal-controlled 3D polymeric cross-linked networks created in the MOF channels address the undesirable leaching associated with adding low-molecular-weight azoles in membranes. Additionally, it generates highly ordered long-range proton-conducting channels through the MOF pores. The acid–base interaction between the imidazole and sulfonic functional groups causes the conductivity of protons to increase to 0.05 S/cm at 80 °C and 70% RH for the S4P3M membrane containing 4 wt % complex filler, which is 16.6-fold higher than that of pure SPEEK. The membrane retains a proton conductivity of up to 0.04 S/cm at 100 °C and 40% RH, indicating its proton-conducting abilities at low humidity conditions. Furthermore, S4P3M achieves a peak power density of 310 mW/cm2 at 60 °C and 347 mW/cm2 at 80 °C under 70% relative humidity, which are higher than those in several other reported literature studies on SPEEK-based membranes.

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Hydroxide ion-conducting metal–organic frameworks for anion-exchange membrane applications

Abstract: With the increasing demand for green energy, there is a great urgency to develop perm-selective, economical and robust membranes for applications in fuel cells. Metal-organic frameworks are attractive materials for...

Cited by 5 publications

References 117 publications

Development of a new class of stable and adaptable free-standing fibre mats with high room-temperature hydroxide-ion conductivity

Development of a new class of stable and adaptable free-standing fibre mats with high room-temperature hydroxide-ion conductivity

Development of a new class of stable and adaptable free-standing fibre mats with high room-temperature hydroxide-ion conductivity

In Situ Polymerization-Mediated Cross-Linking of the MOF Using Poly(1-vinylimidazole) in SPEEK Fuel Cells

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