Protonic Conductivity of Nanocrystalline Zeolitic Imidazolate Framework 8

Barbosa, Paula; Rosero-Navarro, Nataly Carolina; Shi, Fa‐Nian; Figueiredo, Filipe M.

doi:10.1016/j.electacta.2014.11.093

Cited by 44 publications

(39 citation statements)

References 43 publications

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“…Metal organic frameworks (MOFs) is a new type of porous material which is formed by self‐assembly of coordination bonds between organic binding ligands and metal ions . ZIFs, a kind of MOF material, have better thermal stability compared with most other MOF materials . Because of their high porosity, large specific surface area, convenient synthesis, and rich structure, MOFs are widely used in gas adsorption, catalysis, photoelectric materials, and certain other fields .…”

Section: Introductionmentioning

confidence: 99%

“…14,15 ZIFs, a kind of MOF material, have better thermal stability compared with most other MOF materials. 16 Because of their high porosity, large specific surface area, convenient synthesis, and rich structure, MOFs are widely used in gas adsorption, catalysis, photoelectric materials, and certain other fields. [17][18][19][20] At present, some researchers have tried to apply MOFs materials in the field of flame retardancy.…”

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confidence: 99%

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Zeolitic imidazolate frameworks‐8 modified graphene as a green flame retardant for reducing the fire risk of epoxy resin

Wang

et al. 2018

Polymers for Advanced Techs

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A novel hybrid material of ZIF‐8/RGO (zeolitic imidazolate frameworks‐8 loaded the surface of graphene) was synthesised by a simple method and characterized. Then, ZIF‐8/RGO was added into epoxy resin (EP), and the flame retardancy and smoke suppression of the EP composites were studied. Compared with pure EP, the peak heat release rate and the total heat release of the EP composites were reduced remarkably, and their LOI and UL94 vertical burning rating were also improved. In addition, their smoke production rate and total smoke production were decreased drastically. The improved flame retardancy and smoke suppression were mainly attributed to the physical barrier effect of graphene. Meanwhile, the metal oxide decomposed from ZIF‐8 could contribute to the production of char residue and enhance the compactness of the char layer.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Zeolitic imidazolate frameworks‐8 modified graphene as a green flame retardant for reducing the fire risk of epoxy resin

Wang

et al. 2018

Polymers for Advanced Techs

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“…To our great surprise, the resulting DNA@ZIF‐8 membrane indeed exhibits high proton conductivity of 3.40 × 10 −4 S cm −1 at 25 °C and 0.17 S cm −1 at 75 °C, respectively, under 97% RH attributed to the multiple amidogen and phosphate groups inside the channels for the high proton transportation. Furthermore, the small pore entrance sizes of ZIF‐8 of 0.34 nm have also significantly blocked the methanol crossover. For the first time, we thus realize the hybrid MOF membrane with the high proton conductivity but low methanol permeability.…”

Section: Methodsmentioning

confidence: 99%

A DNA‐Threaded ZIF‐8 Membrane with High Proton Conductivity and Low Methanol Permeability

et al. 2017

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Natural biomolecules have potential as proton-conducting materials, in which the hydrogen-bond networks can facilitate proton transportation. Herein, a biomolecule/metal-organic framework (MOF) approach to develop hybrid proton-conductive membranes is reported. Single-strand DNA molecules are introduced into DNA@ZIF-8 membranes through a solid-confined conversion process. The DNA-threaded ZIF-8 membrane exhibits high proton conductivity of 3.40 × 10 S cm at 25 °C and the highest one ever reported of 0.17 S cm at 75 °C, under 97% relatively humidity, attributed to the formed hydrogen-bond networks between the DNA molecules and the water molecules inside the cavities of the ZIF-8, but very low methanol permeability of 1.25 × 10 cm s due to the small pore entrance of the DNA@ZIF-8 membranes. The selectivity of the DNA@ZIF-8 membrane is thus significantly higher than that of developed proton-exchange membranes for fuel cells. After assembling the DNA@ZIF-8 hybrid membrane into direct methanol fuel cells, it exhibits a power density of 9.87 mW cm . This is the first MOF-based proton-conductivity membrane used for direct methanol fuel cells, providing bright promise for such hybrid membranes in this application.

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“…ZIF‐8, as one of the MOF materials, is formed through the combination of Zn 2+ and 2‐methylimidazole. Compared with most other MOFs materials, ZIF‐8 shows better thermal and chemical stability . The surface of the α‐ZrP laminate is negatively charged, and Zn 2+ can be anchored on the α‐ZrP laminate through electrostatic force, so that ZIF‐8 can grow on the surface of α‐ZrP.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with most other MOFs materials, ZIF-8 shows better thermal and chemical stability. 23 The surface of the α-ZrP laminate is negatively charged, and Zn 2+ can be anchored on the α-ZrP laminate through electrostatic force, so that ZIF-8 can grow on the surface of In this study, ZIF-8/α-ZrP hybrid material was prepared by electrostatic force, and ZIF-8/α-ZrP hybrid material was added into PUE through the simple blending method. The whole preparation route is shown in Figure 1.…”

mentioning

confidence: 99%

Surface modification of α‐zirconium phosphate by zeolitic imidazolate frameworks‐8 and its effect on improving the fire safety of polyurethane elastomer

Liu

et al. 2018

Polymers for Advanced Techs

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A novel type of ZIF‐8/α‐ZrP (zeolitic imidazolate frameworks‐8/α‐zirconium phosphate) hybrid was obtained through surface modification of α‐ZrP by ZIF‐8 and was characterized. Subsequently, ZIF‐8/α‐ZrP was added to polyurethane elastomer (PUE) by simple blending, and the thermal behavior, flame retardancy, and smoke suppression properties of the ZIF‐8/α‐ZrP hybrid on PUE were studied. Compared with pure PUE, the test results showed that the char yield of the ZIF‐8/α‐ZrP/PUE composite at 700°C and its Tg values were increased, respectively. The peak heat release rate and total heat release of the ZIF‐8/α‐ZrP/PUE composite decreased by 69.6% and 45.6%, respectively. Meanwhile, its smoke production rate and total smoke production decreased by 59.3% and 40.5%, respectively. The improved flame retardancy and smoke suppression were primarily ascribed to the physical barrier and catalytic carbonization effects of α‐ZrP. Furthermore, the metal oxide decomposed by ZIF‐8 could further facilitate the production of char residue and raise the compactness of the char layer.

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Protonic Conductivity of Nanocrystalline Zeolitic Imidazolate Framework 8

Cited by 44 publications

References 43 publications

Zeolitic imidazolate frameworks‐8 modified graphene as a green flame retardant for reducing the fire risk of epoxy resin

Zeolitic imidazolate frameworks‐8 modified graphene as a green flame retardant for reducing the fire risk of epoxy resin

A DNA‐Threaded ZIF‐8 Membrane with High Proton Conductivity and Low Methanol Permeability

Surface modification of α‐zirconium phosphate by zeolitic imidazolate frameworks‐8 and its effect on improving the fire safety of polyurethane elastomer

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