Nickel Metal Organic Framework Research Articles

Effect of the valence state of initial iron source on oxygen evolution activity of Fe-doped Ni-MOF

The coordination structure of MOF is strongly influenced by central metal ions. Here, we designed and prepared iron-doped nickel metal–organic framework (Fe-doped Ni-MOF) by employing different initial iron sources (Fe2+, Fe3+). Specifically, Fe-doped Ni-MOF with divalent iron ions as initial iron sources exhibits superior performance with respect to trivalent iron ions, showing excellent electrocatalytic performance toward OER with an overpotential (294 mV at 10 mA cm−2), low Tafel slope (47.45 mV dec−1) and large electrochemically active surface area in alkaline electrolytes. Furthermore, there is no obvious decay after long-term operation up to 25 h. To inspect the origin of OER activity enhancement, we resorted to XRD, SEM, TEM, XPS and N2 adsorption–desorption techniques and various electrochemical methods to analyze them in detail. These studies provide a new vision into understanding Fe-doped Ni-MOF for OER, shedding light on designing novel and highly efficient MOF materials for electrocatalysis.

MOF-derived Ni3S4 Encapsulated in 3D Conductive Network for High-Performance Supercapacitor.

Transition-metal sulfide is a good kind of material for supercapacitors because of the large capacity. Nevertheless, the low electroconductivity, slow reaction kinetics, and limited active centers lead to poor electrochemical properties such as long-term cycling stability. In the present work, nano nickel metal-organic framework (Ni-MOF) was constructed by using the nitrogen-rich functional group ligand 2,4,6-tris(3,5-dicarboxylphenylamino)-1,3,5-triazin and compounded with carbon nanotubes (CNTs) to prepare Ni-MOF/CNTs composite, which was used as a precursor to prepare the MOFs-derived NC/Ni-Ni3S4/CNTs composite with the Ni3S4 uniformly distributed in the three-dimensional (3D) conductive network. The rich nitrogen doping and 3D conductive network constructed by CNTs improved the conductivity, prompted the rapid entry of electrolyte, and improved the reaction kinetics of NC/Ni-Ni3S4/CNTs, thus obtained excellent specific capacitance, coulomb efficiency, and cyclic stability. The specific capacitance of NC/Ni-Ni3S4/CNTs is 1489.9 F/g at 1 A/g, which remains 800 F/g at 10 A/g, showing good rate performance.

Ultrathin 2D Metal\u2013Organic Framework Nanosheets In situ Interpenetrated by Functional CNTs for Hybrid Energy Storage Device

HighlightsThe ultrathin nickel metal–organic framework (MOF) nanosheets in situ interpenetrated by functional carboxylated carbon nanotubes (C-CNTs) were successfully constructed. The incorporated C-CNTs effectively adjust the layer thickness of Ni-MOF nanosheets.The integrated hybrid MOF nanosheets delivered the boosted electrochemical performances and exhibited superior specific capacity of 680 C g−1 at 1 A g−1.

In vitro assessment of antimicrobial, antibiofilm and larvicidal activities of bioactive nickel metal organic framework

Multidrug resistant bacteria and mosquito vectors have developed global health threat causing devastating diseases. Novel materials with potent antimicrobial and larvicidal strategies are of urgent need for eradication of disease causing pathogens. The present study focuses on simple fabrication of nickel metal organic framework (Ni-MOFs) with multifunctional biological activities. The synthesized Ni-MOFs particles were characterized by XRD, FTIR, SEM and TEM analysis. The average size of the Ni-MOF was observed to be 761 nm. The experimental results revealed that Ni-MOFs exhibited potent antibacterial activity against extended spectrum β lactamase strain and Pseudomonas aeruginosa. Antibiofilm studies revealed that Ni-MOF exhibited dose dependant inhibition of biofilm formation against MRSA strains ATCC 33591 and clinical strain N7 with IC50 value of 15.19 ± 1.41; 25.14 ± 0.75 μg/ml respectively. Further, larvicidal studies against viral vector Aedes aegypti illustrated that Ni-MOF exhibited excellent larvicidal activity in concentration dependant manner with LC50 value of 43.62 ± 1.25 μg/ml and LC90 value of 74.72 ± 1.97 μg/ml respectively. Safety evaluation study using in vivo model Artemia salina indicated that Ni-MOFs was observed to be non-toxic toxic at lower doses, while at highest dose it exhibits toxicity with LC50 value of 138.33 ± 3.72 μg/ml. The biocompatible nature of Ni-MOFs depicts it as promising nanocarrier for the control of bacterial infection and mosquito population through eco-friendly approach.

Nickel metal–organic framework nanosheets as novel binder-free cathode for advanced fibrous aqueous rechargeable Ni–Zn battery

Ni-MOF nanosheets prepared via a facial and green hydrothermal method act as a novel binder-free cathode for a fibrous aqueous rechargeable Ni–Zn battery.

MOF-derived NiO nanoparticles prilled by controllable explosion of perchlorate ion: Excellent performances and practical applications in supercapacitors

As an energy dot, the ClO4− ion is introduced into one nickel metal-organic framework (Ni-MOF), which appears as micron-scale lanterns. Then Ni-MOF is used as a precursor to prepare a series of NiO materials through a calcination-thermolysis procedure. The explosion behavior of ClO4− ion is exactly controlled by the heating rate, and the size of NiO particle is regularly reduced as increasing the heating rate. At 3 °C min−1, Ni-MOF micron lanterns are well prilled by the ClO4− ion into hierarchical cauliflower-like nanoparticles (NiO-3), which are composed of uniformly distributed superfine florets. Due to large specific surface area, supercapacitive properties of NiO-3 are initially studied by a three-electrode system, which shows a prominent capacitance of 1863 F g−1. Following, NiO-3 is integrated with activated carbon into an asymmetric supercapacitor cell (ASC), which exhibits notable energy density of 38.4 Wh kg−1 at power density of 400 W kg−1 and good long-term recycling (82% retension after 5000 cycles). Significantly, ASC is really applied in lighting, fanning and vehicle, and remarkable performances indicate NiO-3 is a suitable electrode candidate for supercapacitors.

Facile synthesis of Ni-MOF using microwave irradiation method and application in the photocatalytic degradation

Metal-organic frameworks (MOFs) have recently emerged as novel photocatalysts owing to their unique properties such as high surface area, flexibility, well-ordered porous structure, and functionality. In this paper, we report the rapid synthesis procedure of nickel metal-organic framework (Ni-MOF) through the microwave method. SEM and HR-TEM images confirmed that the synthesized MOF had the shape of the wire. The Ni-MOF showed higher photocatalytic efficiency in the degradation of crystal violet (CV) dye under simulated solar light.

Homogeneous nickel metal-organic framework microspheres on reduced graphene oxide as novel electrode material for supercapacitors with outstanding performance

Herein, we designed and prepared nickel metal-organic framework microspheres anchored directly on reduced graphene oxide (Ni-MOF/rGO) by a facile hydrothermal and successive calcining process. The electrode for Ni-MOF/rGO composite annealed at an optimized temperature of 300 °C (Ni-MOF/rGO-300) shows desired conductivity, good cycling stability and high ion-accessible surface area, leading to an ultrahigh specific capacitance of 954 F g−1 at a current density of 1 A g−1 and a remarkable rate capability of 80.25% at 5 A g−1. Meanwhile, the assembled Ni-MOF/rGO-300//activated carbon asymmetric supercapacitor (ASC) shows a favorable energy density up to 17.13 Wh kg−1 at a power density of 750 W kg−1 in the potential window of 0–1.5 V. Moreover, the capacitance retention can still maintain 81.63% after 4000 cycles at a high current density of 5 A g−1. The excellent electrochemical properties can be credited to the synergistic effects between the unique structures of Ni-MOF and rGO, which makes the Ni-MOF/rGO composite a potential electrode material for high performance supercapacitors.

Construction of Ni@Pt/N-doped nanoporous carbon, derived from pyrolysis of nickel metal organic framework, and application for HER in alkaline and acidic solutions

Owing to the growing significance of hydrogen as a non-polluting fuel, design and construction of low-cost, efficient and highly stable electrocatalysts are required for its production by means of water electrolysis. Herein, a general strategy is introduced to fabricate a new type of electrocatalysts based on bimetallic core@shell structure formed on nitrogen-doped nanoporous carbon for electrocatalytic hydrogen evolution reaction (HER). Accordingly, a nickel metal organic framework, Ni‒MOF, synthesized by using benzene-1,3,5-tricarboxylic acid (H3BTC) as the carbon source and 2-methyl-imidazole as the carbon and nitrogen source, is employed, and the nickel/nitrogen−doped nanoporous carbon composite, Ni/NNPC system, is synthesized by the direct carbonization of Ni‒MOF system, i.e. annealing the system in argon atmosphere without using any carbon precursor additive. Then, the outer layers of nickel in Ni/NNPC system are replaced by Pt via galvanic reaction to synthesize the nanostructured system, Ni metal core@Pt thin layer shell, Ni@Pt/NNPC. The step-by-step synthesis of the system and formation of core@shell was supported by several surface analysis techniques. The fabricated materials were transferred onto a glassy carbon (GC) electrode and studied for the HER. The electrochemical results revealed a large electrocatalytic activity for the GCE/Ni@Pt/NNPC system toward the HER in both alkaline and acidic media, compared with GCE, GCE/Ni−MOF and GCE/Ni/NNPC. Tafel slopes of 43.78 and 46.73 mV dec−1, and overpotentials of −33.80 and −76.32 mV (vs RHE) at 20 mA cm−2 (η20) were observed on GCE/Ni@Pt/NNPC electrode in the alkaline and acidic media, under the same conditions, respectively. The observed activity is attributed to (i) the increased electrochemically active surface area, (ii) the cooperative action or synergistic effect between the Pt thin layer shell and the Ni metal core as well as between the Ni@Pt nanoparticles and the NNPC platform, and (iii) effective pore structures of the Ni@Pt/NNPC system.

Oxygen-Evolution Catalysts Based on Iron-Mediated Nickel Metal–Organic Frameworks

Metal–organic frameworks (MOFs) based oxygen-evolution reaction (OER) catalyst is an emerging class of highly porous materials that have become increasingly attractive to develop a highly active an...

Nanoscale nickel metal organic framework decorated over graphene oxide and carbon nanotubes for water remediation

In this report, highly crystalline and well-dispersed nano-sized nickel metal organic framework (MOFs) was decorated over graphene oxide (GO) and carbon nanotubes (CNTs) platforms to form hybrid nanocomposites. These as-synthesized hybrid nanocomposites were synthesized through a one-pot green solvothermal method. The prepared nanocomposites were characterized by SEM, TEM, EDS, XRD, FT-IR, Raman and TGA techniques. XRD analysis revealed the crystalline structure of the hybrid nanocomposites. Morphological and elemental studies also verified successful decoration of nickel-benzene dicarboxylate (Ni-BDC) MOFs over GO and CNT platforms. Chemical analysis collected through IR, and thermal analysis collected through TGA technique, illustrated the presence of all the components in the hybrid nanomaterials. Methylene blue (MB) was used as a model organic pollutant to analyze the adsorption capacity of the prepared nanocomposites. According to the findings, a strong interaction exists between the MB molecule and the developed adsorbents at which due to the synergistic effect, the hybrid nanocomposites show several times higher adsorption capacity compared to that of parent materials. This improvement can be due to several reasons: high surface area of the MOFs in the composites resulting from the smaller size of MOFs, presence of the pores formed between the MOFs and the platforms and different morphological characteristic of Ni-BDC MOFs in hybrid nanocomposites, compared to bare Ni-BDC MOFs. Furthermore, the isotherm and kinetic studies revealed that the adsorption of MB onto the newly prepared adsorbents could best be explained by the Langmuir and Pseudo-second order kinetic models. A regeneration study demonstrated the highly stable nature of the hybrid nanocomposites.

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

AbstractAs a clean energy source, hydrogen may be obtained via overall water splitting. However, the reaction is limited by the anodic oxygen evolution reaction (OER) in the catalytic field. In order to overcome the limitation in OER catalyst activity, this paper attempts to synthesize and develop a series of three‐dimensional metal‐organic frameworks (MOFs) electrocatalytic materials. The structure and morphology of bimetallic cobalt and nickel MOFs are characterized by FT‐IR, Raman, SEM, TEM, and XPS. It is found that the bimetallic cobalt and nickel MOFs have a columnar micro‐structure assembled by nanosheets. Further in‐situ growth on the iron (Fe) foam to prepare an integrated nanoarray self‐supported electrode did not significant change their micro‐structure. The obtained bimetal electrocatalysts exhibit significantly enhanced OER activity as compared to the single‐metal MOFs counterpart. The cobalt and nickel double‐doped materials in‐situ grown on Fe foam exhibited an excellent electrocatalytic activity and remarkable durability with a current density of 10 mA cm−2 in a 0.1 M KOH solution (with the overpotential of 264 mV and the Tafel slope of 54.3 mV dec−1). There is a significant improvement compared with the material on the glassy carbon electrode. The introduction of the bimetal species (Co and Ni) into the ordered MOFs provides a synergistic effect of the active centers resulting in an enhanced electron transfer and improved electrochemical performance. This work enriches the MOFs electrocatalytic electrode and pave the way for their practical applications.

Intermediate Modulation on Noble Metal Hybridized to 2D Metal-Organic Framework for Accelerated Water Electrocatalysis

Summary The rational modulation of reaction intermediates is critical to achieving high-performance heterogeneous catalysis. However, practical realization remains challenging. Using water electrocatalysis as a model reaction, we report an interfacial-bond-induced intermediate modulation to accelerate the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by hybridizing a 2D nickel metal-organic framework (MOF) and Pt nanocrystals into a heterostructure. The design is initially verified via theoretical calculations, indicating charge relocation on newly formed Ni–O–Pt interfacial bonds for increased OH* adsorption energy together with reduced H* adsorption energy. Experimental findings confirm the formation of the Ni–O–Pt bonds, which electronically modify the heterostructure to increase electron density for Pt and the high-energy Ni 3d state for the MOF, optimizing the adsorption for H* and OH*, respectively. This hybridized material delivered HER activity of 7.92 mA μg−1 Pt, which is among the best reported for alkaline electrocatalysts, and an improved OER activity.

Ni-MOF derived NiO/C nanospheres grown in situ on reduced graphene oxide towards high performance hybrid supercapacitor

In this paper, NiO nanoparticles uniformly embedded in spherical carbon matix in situ grown on reduced graphene oxide (rGO) has been successfully fabricated via a simple pyrolysis of nickel metal organic framework (MOF) precursor self-assembled on graphene oxide. This interaction between the carbon and the NiO can significantly maximize the surface of NiO for pseudocapacitance, provide effective electronical transmission path and improve the ionic absorbability and conductivity. As a result, the NiO/C/rGO hybrid electrode demonstrates high specific capacity (496 C g−1 at current density of 1 A g−1) and good cycling stability. Moreover, a hybrid supercapacitor assembled by NiO/C/rGO and a hierarchical porous carbon derived from sodium citrate can deliver a high energy density of 35.9 Wh kg−1 at a power density of 749.1 W kg−1, and extraordinary cycling stability (120% retention after 3000 cycles). It has been demonstrated that the carbon matrix derived from the linker molecules in Ni-MOF, which maintains close contact with both the size-controlled NiO nanocrystals and the electronic conductive rGO, is vital to synergize the electric double layer capacitance from the carbon materials and the battety-type behavior from NiO for high-performance energy storage.

Nickel metal-organic framework nanosheet/hemin composite as biomimetic peroxidase for electrocatalytic reduction of H2O2

A facile and efficient synthesis of hemin containing metal–organic framework (MOF) nanocomposite was reported. Two dimensional (2D) Ni–MOF nanosheets have been used as a new type of matrix material to immobilize hemin. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS)–mapping, thermal gravity analysis (TGA) suggest the hemin is uniformly distributed in the Ni–MOF nanosheets. Ultraviolet–visible spectroscopy (UV–vis) analysis shows that hemin molecules are combined with MOFs nanosheets through π–π interaction. Electrochemical study indicates the Ni–MOFs/Hemin nanocomposite exhibits high electro–catalytic activities for H2O2 reduction and the biosensor offers high performance with a low detection limit of 0.2μM and a wide linear range of 1μM–0.4mM. Furthermore, the Ni–MOFs/Hemin nanocomposite based biosensor displays high selectivity and stability owing to the protective effect of the 2D MOF nanosheets. More importantly, the biosensor was used to determine the H2O2 levels in human serum and disinfectant samples with satisfactory results.

Nickel Metal–Organic Framework Derived Hierarchically Mesoporous Nickel Phosphate toward Smoke Suppression and Mechanical Enhancement of Intumescent Flame Retardant Wood Fiber/Poly(lactic acid) Composites

Over the past decade, the use of metal–organic framework derived materials has emerged as a novel direction to prepare high performance polymer composites. In this work, nickel based metal–organic ...

Ultrathin nickel-metal-organic framework nanobelt based electrochemical sensor for the determination of urea in human body fluids.

Ultrathin nickel-metal–organic framework (Ni-MOF) nanobelts, [Ni20(C5H6O4)20(H2O)8]·40H2O (Ni-MIL-77), have been exploited successfully for the fabrication of a non-enzymatic urea sensor. Ni-MOF ultrathin nanobelts in alkaline media can be used as an efficient catalyst for urea electrooxidation. As a non-enzymatic urea sensor, Ni-MOF ultrathin nanobelts exhibit a high sensitivity of 118.77 μA mM−1 cm−2, wide linear range of 0.01–7.0 mM, and low detection limit of 2.23 μM (S/N = 3). The selectivity, stability and reliability of ultrathin Ni-MOF nanobelts towards urea oxidation are also investigated. Moreover, Ni-MOF ultrathin nanobelts were further used to detect urea in human body fluids. All these findings confirm that the urea sensor based on Ni-MOF ultrathin nanobelts is successfully prepared and promising for applications in medical diagnostics and environmental monitoring.

2D–2D Heterostructured UNiMOF/g-C3N4 for Enhanced Photocatalytic H2 Production under Visible-Light Irradiation

On the basis of ultrathin two-dimensional (2D) nickel metal organic framework (UNiMOF) nanoflakes and 2D g-C3N4 nanoflakes, fresh visible-light-driven 2D/2D heterostructure catalysts were designed, which were assembled with a simplistic electrostatic self-assembly process. The photocatalytic performance of UNiMOF/g-C3N4 for H2 production was evaluated in visible light. The hydrogen evolution of 25.0% UNiMOF/g-C3N4 (UNG-25.0) heterojunction was 20.03 μmol h–1, which was greater than that of pure g-C3N4. In addition, the UNG composites also presented more excellent photocatalytic activity than that of bulk NiMOF/g-C3N4 (BNG) hybrid. This enhanced performance may depend on cooperative potentiation between UNiMOF and g-C3N4 efficiently lowering recombination of carriers. This work showed that constructing 2D–2D heterojunctions provides a feasible approach to obtain highly capable catalysts for photocatalytic decomposition of water.

One-step and scalable synthesis of Ni2P nanocrystals encapsulated in N,P-codoped hierarchically porous carbon matrix using a bipyridine and phosphonate linked nickel metal–organic framework as highly efficient electrocatalysts for overall water splitting

The development of highly active and durable noble-metal-free electrocatalysts for overall water splitting is a great challenge. Herein, a microdroplet flow reaction is used for ultrafast and continuous synthesis of a nickel metal–organic framework material with 4,4ʹ-bipyridine and phosphonate ligands. A one step pyrolysis of this metal–organic framework to various heat treatment temperatures and hold times at maximum temperature give a range of electrocatalysts, containing crystalline Ni2P nanoparticles dispersed in a porous carbonaceous matrix incorporating relatively high concentrations of both nitrogen and phosphorus derived from the original metal–organic framework. The Ni2P electrocatalysts inherite the morphology of the metal–organic framework precursor, have a uniform dispersion of Ni2P sites and Brunauer-Emmett-Teller surface areas in the range 558–754 m2 g−1. The Ni2P electrocatalysts exhibit excellent catalytic performance for both hydrogen and oxygen evolution reactions in 1.0 M KOH and an electrolyzer using Ni2P electrocatalysts as both cathode and anode generates a current density of 10 mA cm−2 at a voltage of 1.62 V with superior durability. This facile and scalable synthesis strategy for the rational design of electrocatalysts represents a proof-of-concept with the potential for scale-up for use in practical applications.

Nickel Metal–Organic Framework Monolayers for Photoreduction of Diluted CO2: Metal‐Node‐Dependent Activity and Selectivity

AbstractPhotocatalytic conversion of diluted CO2 into solar fuel is highly appealing yet still in its infancy. Herein, we demonstrate the metal‐node‐dependent performance for photoreduction of diluted CO2 by constructing Ni metal–organic framework (MOF) monolayers (Ni MOLs). In diluted CO2 (10 %), Ni MOLs exhibit a highest apparent quantum yield of 1.96 % with a CO selectivity of 96.8 %, which not only exceeds reported systems in diluted CO2 but also is superior to most catalysts in pure CO2. Whereas isostructural Co MOLs is almost inactive in diluted CO2, indicating the performance is dependent on the metal nodes. Experimental and theoretical investigations show that strong CO2 binding affinity of Ni MOLs is the crucial factor, which stabilizes the Ni‐CO2 adducts and facilitates CO2‐to‐CO conversion.