Exfoliating layered zeolite MFI into unilamellar nanosheets in solution as precursors for the synthesis of hierarchical nanocomposites and oriented films

Roth, Wiesław J.; Sasaki, Takayoshi; Wolski, Karol; Gil, Barbara; Zapotoczny, Szczepan; Čejka, Jiřı́; Kubů, Martin; Mazur, Michal; Ebina, Yasuo; Sakai, Nobuyuki; Tang, Dai‐Ming; Ma, Renzhi

doi:10.1039/d2qi02283d

Cited by 7 publications

(14 citation statements)

References 46 publications

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“…Simple filtration was shown to afford films and transparent self-standing discs that can be ion exchanged and calcined to activate pores and acid sites. [51,54] XRD patterns confirmed strict orientation expected for high aspect ratio particles by showing only purely interplanar reflection with two Miller indices equal to 0. As-synthesized and calcined films showed different basal spacings.…”

Section: Preparation Of Oriented Films and Membranes With Exfoliated ...supporting

confidence: 58%

“…The flocculation is also useful for verifying exfoliation with subsequent samples since it is not practical to validate all solutions by the advanced physical techniques Reproduced under terms of the CC-BY license. [54] Copyright 2023, The Authors, published by The Royal Society of Chemistry.…”

Section: Proving Monolayered Nature Of Zeolite Nanosheets In Solutionmentioning

confidence: 99%

“…One of the most notable benefits of exfoliated zeolite nanosheets in solution in comparison to the standard 3D crystals lies in the possibility of using the former to produce molecularly or subnanometer intimate composites with other active components including other zeolites, layered materials, nanoparticles, clusters and basically any compound or substance in a suitable form that can interact with the nanosheets. [54,128] Examples of unique materials are illustrated in Figure 9. It should be expected that there can be limitations to obtaining useful or desirable products due to thermodynamics and compatibility reasons like solubility and separation of phases, etc.…”

Section: Preparation Of Intimate Mixtures Of Different Zeolites and C...mentioning

confidence: 99%

“…Since the first publication in 2020 there have been several additional reports with well documented cases of such direct exfoliation. [ 52–54 ] They show feasibility for all layered zeolite frameworks and illustrate the requirements for conclusive proving of the genuine monolayered nature of the nanosheet in solution, which is not trivial and requires special approach combining several complementary techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 8. Electron microscopy images and SAED of MWW, bifer and MFI layers, MWW-surfactant composites (top right), pillared mixture of MWW and bifer layers (right center) and oriented MFI discs (right bottom).Reproduced under terms of the CC-BY license [54]. Copyright 2023, The Authors, published by The Royal Society of Chemistry.…”

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confidence: 99%

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Current State and Perspectives of Exfoliated Zeolites

Roth,

Opanasenko,

Mazur

et al. 2023

Advanced Materials

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Zeolites are highly efficient industrial catalysts and sorbents with microporous framework structures. Approximately 10% of the frameworks, but eventually all in the long run, produced both 3D crystals and 2D layers. The latter can be intercalated and expanded like all 2D materials but proved difficult to exfoliate directly into suspensions of monolayers in solution as precursors for unique synthetic opportunities. Successful exfoliations have been reported recently and are overviewed in this perspective article. The discussion highlights 3 primary challenges in this field, namely finding suitable 2D zeolite preparations that exfoliate directly in high yield, proving uniform layer thickness in solution and identifying application to exploit the unique synthetic capabilities and properties. There are altogether 4 zeolites confirmed to exfoliate directly into monolayers: 3 with known structures – MWW, MFI and RWR and one unknown, bifer with a unit cell close to ferrierite. The exfoliation into monolayers is confirmed by the combination of 5–6 experimental techniques including AFM, in situ and in‐plane XRD, and microscopies. The promising areas of development are oriented films and membranes, intimately mixed zeolite phases, and hierarchical nanoscale composites with other active species like nanoparticles and clusters that are unfeasible by solid state processes.This article is protected by copyright. All rights reserved

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Section: Preparation Of Oriented Films and Membranes With Exfoliated ...supporting

confidence: 58%

Section: Proving Monolayered Nature Of Zeolite Nanosheets In Solutionmentioning

confidence: 99%

Section: Preparation Of Intimate Mixtures Of Different Zeolites and C...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Current State and Perspectives of Exfoliated Zeolites

Roth,

Opanasenko,

Mazur

et al. 2023

Advanced Materials

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Two‐Dimensional MFI‐Type Zeolite Flow Battery Membranes

Zhang,

Huang,

Xia

et al. 2023

Angewandte Chemie

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Vanadium flow battery (VFB) is one of the most reliable stationary electrochemical energy‐storage technologies, and a membrane with high vanadium resistance and proton conductivity is essential for manufacturing high‐performance VFBs. In this study, a two‐dimensional (2D) MFI‐type zeolite membrane was fabricated from zeolite nanosheet modules, which displayed excellent vanadium resistance (0.07 mmol L‐1 h‐1) and proton conductivity (0.16 S cm‐1), yielding a coulombic efficiency of 93.9%, a voltage efficiency of 87.6%, and an energy efficiency of 82.3% at 40 mA cm‐2. The self‐discharge period of a VFB equipped with 2D MFI‐type zeolite membrane increased up to 116.2 h, which was significantly longer than that of the commercial perfluorinated sulfonate membrane (45.9 h). Furthermore, the corresponding battery performance remained stable over 1000 cycles (> 1500 h) at 80 mA cm‐2. These findings demonstrate that 2D MFI‐type membranes are promising ion‐conductive membranes applicable for stationary electrochemical energy‐storage devices.

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