Metal-organic framework (MOF) is highly desirable as a functional material owing to its low density, tunable pore size, and diversity of coordination formation, but limited by the poor dielectric properties. Herein, by controlling the solvent and mole ratio of cobalt/linker, multidimension-controllable MOF-derived nitrogen-doped carbon materials exhibit tunable morphology from sheet-, flower-, cube-, dodecahedron- to octahedron-like. Tunable electromagnetic parameters of Co@N-doped carbon composites (Co@NC) can be obtained and the initial MOF precursor determines the distribution of carbon framework and magnetic cobalt nanoparticles. Carbonized Co@NC composites possess the following advantages: i) controllable dimension and morphology to balance the electromagnetic properties with evenly charged density distribution; ii) magnetic-carbon composites offer plenty of interfacial polarization and strong magnetic coupling network; iii) a MOF-derived dielectric carbon skeleton provides electronic transportation paths and enhances conductive dissipation. Surface-mediated magnetic coupling reflects the stray magnetic flux field, which is corroborated by the off-axis electron holography and micro-magnetic simulation. Optimized octadecahedral Co@NC sample exhibits the best microwave absorption (MA) of -53.0 dB at the thickness of 1.8 mm and broad effective frequency from 11.4 to 17.6 GHz (Ku-band). These results pave the way to fabricate high-performance MA materials with balanced electromagnetic distribution and controlled morphology.

Multidimension-Controllable Synthesis of MOF-Derived Co@N-Doped Carbon Composite with Magnetic-Dielectric Synergy toward Strong Microwave Absorption

Gas separation processes are amongst the most important operations in the refineries and gas-related industries. Recently, many efforts are being dedicated towards modifying the gas separation properties of existing polymers to further expand their use for extensive industrial gas separation applications. Mixed matrix membranes (MMMs), which are organic–inorganic hybrid membranes, have been proposed as the alternative approach to intensify the comprehensive gas separation performance of the polymeric membranes. In this regard, we analyze and review the recent scientific and technological advances in the development of MMM's, including the emerging class of inorganic fillers like two-dimensional (2D)materials, that have been the focus of much recent work for gas separation. The review also discusses the current issues associated with the filler materials and further provides an outline to overcome the emerging challenges for the future development of high performance MMMs.

A review on the recent advances in mixed matrix membranes for gas separation processes

Two-dimensional MXene incorporated chitosan mixed-matrix membranes for efficient solvent dehydration

Development of platinum group metal (PGM)-free and iron-free catalysts for the kinetically sluggish oxygen reduction reaction (ORR) is crucial for proton-exchange membrane fuel cells. A major chall...

Atomically Dispersed MnN4 Catalysts via Environmentally Benign Aqueous Synthesis for Oxygen Reduction: Mechanistic Understanding of Activity and Stability Improvements

In situ fabrication of MOF nanoparticles in PDMS membrane via interfacial synthesis for enhanced ethanol permselective pervaporation

A series of aluminum-based coordination polymers or metal⁻organic frameworks (Al⁻MOFs), i.e., DUT-4, DUT-5, MIL-53, NH₂-MIL-53, and MIL-100, have been facile prepared by microwave (MW)-assisted reactions and used as catalysts for selective sulfoxidation reactions. The MW-assisted synthesis drastically reduced the reaction time from few days to hours. The prepared MOFs have smaller and uniform particle sizes and better yield compared to conventional hydrothermal method. Furthermore, the Al⁻MOFs have been successfully demonstrated as catalysts in oxidation reaction of methyl phenyl sulfide with H₂O₂ as oxidant, even under mild conditions, with more than 95% conversion.

Microwave-Assisted Synthesis of Nanoporous Aluminum-Based Coordination Polymers as Catalysts for Selective Sulfoxidation Reaction

Microporous 3D aluminum MOF doped into chitosan‐based mixed matrix membranes for ethanol/water separation

A series of aluminum-based coordination polymers or metal–organic frameworks (Al–MOFs), i.e., DUT-4, DUT-5, MIL-53, NH2-MIL-53, and MIL-100, have been facile prepared by microwave (MW)-assisted reactions and used as catalysts for selective sulfoxidation reactions. The MW-assisted synthesis drastically reduced the reaction time from few days to hours. The prepared MOFs have smaller and uniform particle sizes and better yield compared to conventional hydrothermal method. Furthermore, the Al–MOFs have been successfully demonstrated as catalysts in oxidation reaction of methyl phenyl sulfide with H2O2 as oxidant, even under mild conditions, with more than 95% conversion.

Tetrazine-Based Metal-Organic Frameworks as Scaffolds for Post-Synthetic Modification by the Click Reaction

Evolving cost-effective and high-efficiency catalysts for efficient ammonia borane (AB) hydrolysis is highly desired but leftovers are a great challenge. Catalysis with high efficiency may be achieved by rationally modifying the intention and electronic state. The development of carbonized zeolite imidazole framework (ZIF-67) based Ru nanoparticles (NPs) dispersed [email protected]3O4/NC-350 NPs catalyst composition was prepared for the carrier catalysts. The ZIF-67 was introduced with different calcination temperatures for the carbonized porous materials. Only the calcination temperature at 350 °C with [email protected]3O4/NC-350 NPs shows the good ability in its catalytic activity. The addition of 3.0 wt.% Ru NPs into the hollow ZIF-67 porous metal-organic framework (MOF) yielded highly stable with good morphology and porous. Ru NPs dispersed on carbonized Co3O4/NC have a hollow porous structure with a convoluted nano restricted inner region between Co3O4 and NC, allowing for a large number of accessible active sites and easy mass transfer and controlling the carbonized temperature can change the composition of Co3O4/NC heterostructures. These hollow porous carbon materials show much higher turnover frequency during a very short time and also high stability after ten cycles for the AB hydrolysis. This carbonized sample of [email protected]3O4/NC-350 NPs exhibited increased catalyst stability and materials reusability. There is particularly great potential for industrial application of this catalytic system in fuel cells, because of its simple preparation method, the use of relatively cheap metals, and its highly active catalysis. 

Ultrafine Ru nanoparticles in shape control hollow octahedron MOF derived cobalt oxide@carbon as high-efficiency catalysts for hydrolysis of ammonia borane

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Microwave-Assisted Synthesis of Nanoporous Aluminum-Based Coordination Polymers as Catalysts for Selective Sulfoxidation Reaction

Microporous 3D aluminum MOF doped into chitosan‐based mixed matrix membranes for ethanol/water separation

Microwave-Assisted Synthesis of Nanoporous Aluminum-Based Coordination Polymers as Catalysts for Selective Sulfoxidation Reaction

Tetrazine-Based Metal-Organic Frameworks as Scaffolds for Post-Synthetic Modification by the Click Reaction

Ultrafine Ru nanoparticles in shape control hollow octahedron MOF derived cobalt oxide@carbon as high-efficiency catalysts for hydrolysis of ammonia borane