Novel and Facile Strategy for Controllable Synthesis of Multilayered Core–Shell Zeolitic Imidazolate Frameworks

Zhang, Jingcheng; Zhang, Tianci; Xiao, Kesong; Cheng, Sheng; Qian, Gang; Wang, Yan; Feng, Yi

doi:10.1021/acs.cgd.6b01161

Cited by 59 publications

(47 citation statements)

References 26 publications

(45 reference statements)

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“…The presence of high-intensity peaks in the PXRD spectra is in good agreement with the highly crystalline nature of the synthesized core–shell ZIFs. 36−38 Diffraction peaks appeared at 2θ values of 7.52, 10.53, 12.90, 14.86, 16.60, 18.21, 22.21, 24.66, and 26.82° were identified for the (011), (002), (112), (002), (013), (222), (114), (233), and (134) planes, respectively. 29 The PXRD characteristics of the parent ZIF-8 (Basolite Z1200) resemble well the earlier reported PXRD patterns of Basolite Z1200 (Figures 1c and S3).…”

Section: Resultsmentioning

confidence: 99%

“…Distribution of Zn in the core and Co at the shell in ZIF-8@ZIF-67 and analogously Co in the core and Zn at the shell in ZIF-67@ZIF-8 clearly evidenced the core–shell frameworks of the synthesized ZIF-8@ZIF-67 and ZIF-67@ZIF-8 frameworks. 36−38 Despite the fact that ZIF-67@ZIF-8 has a larger particle size than ZIF-8@ZIF-67, the core-to-shell thickness ratio was observed to be comparable for both the core–shell ZIFs (Table S1).…”

Section: Resultsmentioning

confidence: 99%

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Core–Shell Zeolitic Imidazolate Frameworks for Enhanced Hydrogen Storage

Panchariya¹,

Rohit²,

Kumar

et al. 2018

ACS Omega

134

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Core–shell ZIF-8@ZIF-67- and ZIF-67@ZIF-8-based zeolitic imidazolate frameworks (ZIFs) were synthesized solvothermally using a seed-mediated methodology. Transmission electron microscopy–energy-dispersive X-ray spectrometry, line scan, elemental mapping, X-ray photoelectron spectroscopy, and inductively coupled plasma-atomic emission spectroscopy analyses were performed to confirm the formation of a core–shell structure with the controlled Co/Zn elemental composition of ∼0.50 for both the core–shell ZIFs. The synthesized core–shell ZIF-8@ZIF-67 and ZIF-67@ZIF-8 frameworks conferred enhanced H 2 (2.03 and 1.69 wt %) storage properties at 77 K and 1 bar, which are ca. 41 and 18%, respectively, higher than that of the parent ZIF-8. Notably, the distinctly remarkable H 2 storage properties shown by both the core–shell ZIFs over the bimetallic Co/Zn-ZIF and the physical mixture of ZIF-8 and ZIF-67 clearly evidenced their unique structural properties (confinement of porosity) and elemental heterogeneity due to the core–shell morphology of the outperforming core–shell ZIFs. Moreover, H 2 adsorption isotherm data of these frameworks are best fitted with the Langmuir model ( R 2 ≥ 0.9999). Along with the remarkably enhanced H 2 storage capacities, the core–shell ZIFs also displayed an improved CO 2 capture behavior. Hence, we demonstrated here that the controlled structural features endorsed by the rationally designed porous materials may find high potential in H 2 storage applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Core–Shell Zeolitic Imidazolate Frameworks for Enhanced Hydrogen Storage

Panchariya¹,

Rohit²,

Kumar

et al. 2018

ACS Omega

134

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“…When a pre‐synthesized MOF is added to a solution of additional linker and a different metal species ( b ), a core–shell structure ( C ) is most likely obtained. The additional precursors lead to the homogeneous formation of an additional framework structure around the initially synthesized particles –. Heterometallic heteroepitaxial SURMOFs are synthesized using b , as well .…”

Section: Mixed‐metal Metal–organic Frameworkmentioning

confidence: 99%

Synthetic Strategies and Structural Arrangements of Isoreticular Mixed‐Component Metal–Organic Frameworks

Bitzer

Kleist

2019

Chemistry A European J

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In recent years, the synthesis of mixed‐metal and mixed‐linker metal–organic frameworks with multiple metals and/or linker molecules combined in one framework has become a growing field of interest. These mixed‐component or multivariate metal–organic framework materials provide the possibility to introduce multiple functionalities inside one framework. The interaction of guest molecules with different functionalities in the same material is a promising approach in the fields of gas storage, separation, catalysis and drug delivery. Furthermore, the combination of different components may lead to synergistic effects that cannot be achieved otherwise. These mixed‐component approaches open up new pathways to an even larger range of possible customizations in the field of metal–organic frameworks.

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“…40,57,58 Moreover, a core-shell structure containing ZnCo bimetal NPs was also used as an ideal precursor to synthesize an efficient electrocatalyst for both ORR and OER. 14,59 Generally, traditional ZIF core-shell structures were usually synthesized by epitaxial growth method which contains collection, clean, dry and dispersion of the core seed crystals before formation of core-shell materials, [60][61][62] which is a relatively complex method. Since ORR is an interfacial catalytic reaction, the accessibility of the active sites is significantly critical.…”

Section: Introductionmentioning

confidence: 99%

Zeolitic-imidazolate Framework (ZIF)@ZnCo-ZIF Core-shell Template Derived Co, N-doped Carbon Catalysts for Oxygen Reduction Reaction

Hua¹,

Liu²,

Cheng³

et al. 2018

Eng. Sci.

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Exposure of the active sites directly determines the catalytic activity of porous carbon electrocatalysts for oxygen reduction reaction (ORR). How to maximally expose these active sites in as-synthesized carbons is still a great challenge. Here we propose an efficient strategy to maximally expose the active sites of porous carbon catalysts, in which we use core-shell ZIF-8@ZnCo-ZIF (op-ZnCo-ZIF) as a precursor to synthesize Co, N-doped carbon catalysts (op-ZnCo-950) by pyrolysis. The low boiling metal Zn in the core-shell template can serve as the activation agent to yield the micropores and mesopores, and the cobalt in the shell is therefore dispersed well in the surface of as-synthesized carbons during the pyrolysis. As a result, the resultant op-ZnCo-950 exhibits a relatively high catalytic activity towards ORR with a half-wave potential of 0.846 V (vs RHE), and the higher methanol resistance and better stability than 20% Pt/C. This work provides an efficient core-shell template strategy for synthesis of carbon catalysts with highly exposed active sites for electrochemical applications including ORR, hydrogen evolution reaction and oxygen evolution reaction.

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Novel and Facile Strategy for Controllable Synthesis of Multilayered Core–Shell Zeolitic Imidazolate Frameworks

Abstract: Core−shell metal organic framework (MOF) crystals have attracted increasing attention due to their specific structure and remarkable properties. Herein, we demonstrate a facile approach for the synthesis of uniform multilayered core− shell MOF crystals

Cited by 59 publications

References 26 publications

Core–Shell Zeolitic Imidazolate Frameworks for Enhanced Hydrogen Storage

Core–Shell Zeolitic Imidazolate Frameworks for Enhanced Hydrogen Storage

Synthetic Strategies and Structural Arrangements of Isoreticular Mixed‐Component Metal–Organic Frameworks

Zeolitic-imidazolate Framework (ZIF)@ZnCo-ZIF Core-shell Template Derived Co, N-doped Carbon Catalysts for Oxygen Reduction Reaction

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