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Artigos de revistas sobre o tema "MOF poreux flexible"

Autor: Grafiati
Publicado: 12 de abril de 2025

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1

Zhang, Junxuan, Jie You, Qing Wei, Jeong-In Han e Zhiming Liu. "Hollow Porous CoO@Reduced Graphene Oxide Self-Supporting Flexible Membrane for High Performance Lithium-Ion Storage". Nanomaterials 13, n.º 13 (30 de junho de 2023): 1986. http://dx.doi.org/10.3390/nano13131986.

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We report an environment-friendly preparation method of rGO-based flexible self-supporting membrane electrodes, combining Co-MOF with graphene oxide and quickly preparing a hollow CoO@rGO flexible self-supporting membrane composite with a porous structure. This unique hollow porous structure can shorten the ion transport path and provide more active sites for lithium ions. The high conductivity of reduced graphene oxide further facilitates the rapid charge transfer and provides sufficient buffer space for the hollow Co-MOF nanocubes during the charging process. We evaluated its electrochemical performance in a coin cell, which showed good rate capability and cycling stability. The CoO@rGO flexible electrode maintains a high specific capacity of 1103 mAh g−1 after 600 cycles at 1.0 A g−1. The high capacity of prepared material is attributed to the synergistic effect of the hollow porous structure and the 3D reduced graphene oxide network. This would be considered a promising new strategy for synthesizing hollow porous-structured rGO-based self-supported flexible electrodes.
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Ling, Yajing, Jingjing Jiao, Mingxing Zhang, Huimin Liu, Dongjie Bai, Yunlong Feng e Yabing He. "A porous lanthanide metal–organic framework based on a flexible cyclotriphosphazene-functionalized hexacarboxylate exhibiting selective gas adsorption". CrystEngComm 18, n.º 33 (2016): 6254–61. http://dx.doi.org/10.1039/c6ce00497k.

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Deng, Mingli, Shijun Tai, Weiquan Zhang, Yongchen Wang, Jiaxing Zhu, Jinsheng Zhang, Yun Ling e Yaming Zhou. "A self-catenated rob-type porous coordination polymer constructed from triazolate and carboxylate ligands: fluorescence response to the reversible phase transformation". CrystEngComm 17, n.º 31 (2015): 6023–29. http://dx.doi.org/10.1039/c5ce00887e.

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4

Ma, Qintian, Qingyuan Yang, Aziz Ghoufi, Ke Yang, Ming Lei, Gérard Férey, Chongli Zhong e Guillaume Maurin. "Guest-modulation of the mechanical properties of flexible porous metal–organic frameworks". J. Mater. Chem. A 2, n.º 25 (2014): 9691–98. http://dx.doi.org/10.1039/c4ta00622d.

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The highly flexible hybrid nanoporous MOF MIL-53(Cr) was evoked as a potential medium to store mechanical energy via a structural switching from an open to a close pore form under moderate applied external pressures.
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Yin, Zheng. "Metal Doping Induced Formation and Dynamic Gas Sorption of a Highly Porous Mesoporous MetalOrganic Framework". Advance Research in Organic and Inorganic Chemistry (AROIC) 4, n.º 1 (26 de abril de 2023): 1–2. http://dx.doi.org/10.54026/aroic/1015.

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A new high-porosity MOF of [Ni2.3Zn0.7(tzba)3 (H2 O)6 ]·12DMF (NiZn-MOF) processes 2D (3,6)-grid layers constructed from rare [M2 (tz)3 (H2 O)3 ] and [M(COO)3 ] nodes. The metal doping of Ni2+ and Zn2+ are crucial for the formation of the two kinds of metal nodes and subsequent synergistical assembly into the mesoporous MOF, in contrast to the formation of MIL-88-topology resembled compound of {(Me2 NH2 )[Ni3 (μ3 -OH)(tzba)3 (H2 O)3 ]·8DMF (Ni3-MOF) using single Ni2+ as metal source. The regular 2D layers stacked in parallel and ABAB fashion through interlayer hydrogen bonding, leading to a neutral framework with void fraction up to 72.1% and 1D mesoporous hexagonal channels sized at 24.0 Å in diameter. The large gas accessible porosity was revealed by the saturated N2 and CO2 uptake of 720 and 708 cm3 g-1, at 77 K and 195 K, respectively, giving a high Langmuir surface area of 2066 m2 g-1. The varying gas sorption amounts dependent on accommodated solvents and activation temperature, as well as the gate-opening behaviors in sorption isotherms, well confirm the dynamic structure response to guest species of the flexible framework.
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6

Benecke, Jannik, Alexander Fuß, Tobias A. Engesser, Norbert Stock e Helge Reinsch. "A Flexible and Porous Ferrocene‐Based Gallium MOF with MIL‐53 Architecture". European Journal of Inorganic Chemistry 2021, n.º 8 (9 de fevereiro de 2021): 713–19. http://dx.doi.org/10.1002/ejic.202001085.

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7

Cao, Xiao-Man, Zhi-Jia Sun, Si-Yu Zhao, Bing Wang e Zheng-Bo Han. "MOF-derived sponge-like hierarchical porous carbon for flexible all-solid-state supercapacitors". Materials Chemistry Frontiers 2, n.º 9 (2018): 1692–99. http://dx.doi.org/10.1039/c8qm00284c.

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Novel 3D sponge-like hierarchical porous carbons using different-sized MOFs (Zn(tbip)) as precursors are successfully prepared via a one-step pyrolysis process, and are promising for application in high-performance flexible all-solid-state supercapacitors.
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Li, Zhen, Jingting Bu, Chenying Zhang, Lingli Cheng, Dengyu Pan, Zhiwen Chen e Minghong Wu. "Electrospun carbon nanofibers embedded with MOF-derived N-doped porous carbon and ZnO quantum dots for asymmetric flexible supercapacitors". New Journal of Chemistry 45, n.º 24 (2021): 10672–82. http://dx.doi.org/10.1039/d1nj01369f.

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9

HU, ZHIGANG, e DAN ZHAO. "POLYMERIZATION WITHIN CONFINED NANOCHANNELS OF POROUS METAL-ORGANIC FRAMEWORKS". Journal of Molecular and Engineering Materials 01, n.º 02 (junho de 2013): 1330001. http://dx.doi.org/10.1142/s2251237313300015.

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Metal-organic frameworks (MOFs) have been increasingly investigated as templates for precise control of polymerization. Polymerizations within confined nanochannels of porous MOFs have shown unique confinement and alignment effect on polymer chain structures and thus are promising ways to achieve well-defined polymers. Herein, this review will focus on illustrating the recent progress of polymerization within confined nanochannels of MOFs, including radical polymerization, coordination polymerization, ring-opening polymerization, catalytic polymerization, etc. It will demonstrate how the heterogeneous MOF structures (pore size, pore shapes, flexible structures, and versatile functional groups) affect the polymeric products' molecular weight, molecular weight distribution, tacticity, reaction sites, copolymer sequence, etc. Meanwhile, we will highlight some challenges and foreseeable prospects on these novel polymerization methods.
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10

Li, Zhen, Julio Fraile, Clara Viñas, Francesc Teixidor e José G. Planas. "Post-synthetic modification of a highly flexible 3D soft porous metal–organic framework by incorporating conducting polypyrrole: enhanced MOF stability and capacitance as an electrode material". Chemical Communications 57, n.º 20 (2021): 2523–26. http://dx.doi.org/10.1039/d0cc07393h.

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11

Chalati, T., P. Horcajada, R. Gref, P. Couvreur e C. Serre. "Optimisation of the synthesis of MOF nanoparticles made of flexible porous iron fumarate MIL-88A". J. Mater. Chem. 21, n.º 7 (2011): 2220–27. http://dx.doi.org/10.1039/c0jm03563g.

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Wang, Lin, Wei-Wei He, Zhao-Quan Yao e Tong-Liang Hu. "A Flexible Porous MOF Exhibiting Reversible Breathing Behavior through Single-Crystal to Single-Crystal Transformation". ChemistrySelect 2, n.º 1 (9 de janeiro de 2017): 283–87. http://dx.doi.org/10.1002/slct.201601666.

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Wen, Lili, Dong’e Wang, Chenggang Wang, Feng Wang, Dongfeng Li e Kejian Deng. "A 3D porous zinc MOF constructed from a flexible tripodal ligand: Synthesis, structure, and photoluminescence property". Journal of Solid State Chemistry 182, n.º 3 (março de 2009): 574–79. http://dx.doi.org/10.1016/j.jssc.2008.11.031.

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14

Hess, Samuel C., Robert N. Grass e Wendelin J. Stark. "MOF Channels within Porous Polymer Film: Flexible, Self-Supporting ZIF-8 Poly(ether sulfone) Composite Membrane". Chemistry of Materials 28, n.º 21 (20 de outubro de 2016): 7638–44. http://dx.doi.org/10.1021/acs.chemmater.6b02499.

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15

Wang, Xiao, Yanan Wang, Yali Liu, Xiyue Cao, Feifei Zhang, Jianfei Xia e Zonghua Wang. "MOF-derived porous carbon nanozyme-based flexible electrochemical sensing system for in situ and real-time monitoring of H2O2 released from cells". Talanta 266 (janeiro de 2024): 125132. http://dx.doi.org/10.1016/j.talanta.2023.125132.

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16

Mohan, Gopalakrishnan, e Soorathep Kheawhom. "3D MOF Derived Porous Nanorods like Cation Defect-Rich Ni0.6Fe2.4O4@NC Efficient Electrocatalyst Enables Robust Rechargeable Zinc-Air Batteries". ECS Meeting Abstracts MA2024-02, n.º 9 (22 de novembro de 2024): 1423. https://doi.org/10.1149/ma2024-0291423mtgabs.

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Electrochemical energy storage devices with consistent performance, high power output, and energy density are urgently required to meet global energy demand. Zinc-air batteries are quickly gaining popularity as potential energy sources for green energy storage technologies. The air electrodes, combined with some oxygen electrocatalysts, have a significant impact on the cost and performance of Zn-air batteries. However, designing and fabricating efficient electrocatalysts remains a challenge. Because of their unique structural flexibility and uniformly dispersed active sites, metal-organic frameworks (MOFs) have emerged as appealing precursors for the synthesis of a wide range of advanced functional materials. Our research suggests using flexible multi-carboxylic acids and bipyridine ligands to create nanorods like NiFe@MOFs with multiple coordination modes and fascinating architectures. MOF precursors were post-annealed in argon at 750 °C, yielding a cation deficient Ni0.6Fe2.4O4@NC electrocatalyst. This 3D electrocatalyst effectively reduces oxygen (E1/2 = 0.85 V) and evolves oxygen (η10 = 207 mV@10 mA cm-2). Furthermore, a rechargeable zinc-air battery with Ni0.6Fe2.4O4@NC as the cathode demonstrated a high open circuit voltage (OCV) of 1.5 V, a peak power density of 194.6 mW cm-2, and exceptional long-term cycling stability over 300 h (1800 cycles, 10 mA cm-2). The flexible solid-state zinc-air battery demonstrated power density of 68.5 mW cm-2 and long-term durability over 35 h at 5 mA cm-2. The proposed strategy allows for the rational design of cation defect-rich spinel structures attached to ultra-thin, N-doped graphitic carbon sheets in order to enhance active site availability and mass electron transport. Figure 1
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17

Basu, Aniruddha, Kingshuk Roy, Neha Sharma, Shyamapada Nandi, Ramanathan Vaidhyanathan, Sunit Rane, Chandrashekhar Rode e Satishchandra Ogale. "CO2 Laser Direct Written MOF-Based Metal-Decorated and Heteroatom-Doped Porous Graphene for Flexible All-Solid-State Microsupercapacitor with Extremely High Cycling Stability". ACS Applied Materials & Interfaces 8, n.º 46 (11 de novembro de 2016): 31841–48. http://dx.doi.org/10.1021/acsami.6b10193.

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Javed, Muhammad Sufyan, Nusrat Shaheen, Shahid Hussain, Jinliang Li, Syed Shoaib Ahmad Shah, Yasir Abbas, Muhammad Ashfaq Ahmad, Rizwan Raza e Wenjie Mai. "An ultra-high energy density flexible asymmetric supercapacitor based on hierarchical fabric decorated with 2D bimetallic oxide nanosheets and MOF-derived porous carbon polyhedra". Journal of Materials Chemistry A 7, n.º 3 (2019): 946–57. http://dx.doi.org/10.1039/c8ta08816k.

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19

Sousa, Antonio C. M., e Fangming Jiang. "SPH as an Inverse Numerical Tool for the Prediction of Diffusive Properties in Porous Media". Materials Science Forum 553 (agosto de 2007): 171–89. http://dx.doi.org/10.4028/www.scientific.net/msf.553.171.

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Heat and mass transfer and fluid flow in porous media are usually characterized by, or associated with, the effective thermal conductivity, the effective mass diffusivity and the permeability, respectively. All these macroscopic quantities are conceptually established on a phenomenological “equivalence” basis. They may contain the influence of porous micro-structures upon the corresponding diffusive process; however, the detailed nature inside the porous medium is lumped and neglected. Pore scale numerical modelling has the potential of providing adequate meso-/micro- scale insight into the transport process in porous medium, as well as obtaining macroscopic properties, which can encompass the complex pore-structure details. Modelling heat/mass transfer and fluid flow in complicated porous micro-structures presents a major challenge to numerical methods due to their multiscale and multiphysics nature. A relatively-novel numerical technique - the meshless Lagrangian-based Smoothed Particle Hydrodynamics (SPH) method is thought to be capable of making a significant contribution to this research field. This work deals primarily with the SPH modelling of heat conduction and fluid flow in 2-D isotropic porous media. The porous matrix is formed by randomly including a different component into a base component. Various pore-structures are realized by changing the inclusion shape/size, or the relative arrangement condition between inclusions. Pore-scale heat transfer and fluid flow streams are visualized, and both heat transfer and fluid flow always follow, as expected, the paths of least resistance through the porous structures. In what concerns the effective thermal conductivity, for the porous media with the base component of larger bulk thermal conductivity, the “flexible” EMT model, which can accommodate, to some extent, the influence from the porous micro-structures on the effective thermal conductivity by adjusting the so-called flexible factor ff, gives effective thermal conductivities agreeable to the SPH predictions across the whole composition range if ff is taken to be ~ 4.5; the effective thermal conductivity shows a weak dependence on the inclusion shape/size and the relative arrangement condition between inclusions; however, for porous media with dispersed inclusions, which component has larger bulk thermal conductivity presents a strong effect upon the effective thermal conductivity. The SPH fluid flow simulation results confirm the macroscopic Darcy’s law to be valid only in the creeping flow regime; the dimensionless permeability (normalized by the squared characteristic dimension of the inclusions) is found to have an exponential dependence on the porosity within the intermediate porosity range, and the derived dimensionless permeability /""porosity relation is found to have only a minor dependence on either the relative arrangement condition between inclusions or the inclusion shape/area.
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20

Hui, Siyue, Huanzhi Zhang, Guangpeng Xu, Junhao Zhang, Fen Xu, Lixian Sun, Xiangcheng Lin et al. "Hierarchically porous and flexible BN/Co-MOF aerogel encapsulated paraffin for efficient dual-thermal insulation". Journal of Materials Chemistry A, 2025. https://doi.org/10.1039/d4ta07235a.

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21

Koutsianos, Athanasios, Roman Pallach, Louis Frentzel-Beyme, Chinmoy Das, Michael Paulus, Christian Sternemann e Sebastian Henke. "Breathing porous liquids based on responsive metal-organic framework particles". Nature Communications 14, n.º 1 (14 de julho de 2023). http://dx.doi.org/10.1038/s41467-023-39887-3.

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AbstractResponsive metal-organic frameworks (MOFs) that display sigmoidal gas sorption isotherms triggered by discrete gas pressure-induced structural transformations are highly promising materials for energy related applications. However, their lack of transportability via continuous flow hinders their application in systems and designs that rely on liquid agents. We herein present examples of responsive liquid systems which exhibit a breathing behaviour and show step-shaped gas sorption isotherms, akin to the distinct oxygen saturation curve of haemoglobin in blood. Dispersions of flexible MOF nanocrystals in a size-excluded silicone oil form stable porous liquids exhibiting gated uptake for CO2, propane and propylene, as characterized by sigmoidal gas sorption isotherms with distinct transition steps. In situ X-ray diffraction studies show that the sigmoidal gas sorption curve is caused by a narrow pore to large pore phase transformation of the flexible MOF nanocrystals, which respond to gas pressure despite being dispersed in silicone oil. Given the established flexible nature and tunability of a range of MOFs, these results herald the advent of breathing porous liquids whose sorption properties can be tuned rationally for a variety of technological applications.
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Zhang, Qin, Shanjia Pan, Zhipeng Wang, Yanqin Yang e Songzhan Li. "MOF-derived porous Ni3S4/CoS nanosheet arrays for flexible supercapacitor electrode". Ionics, 1 de novembro de 2023. http://dx.doi.org/10.1007/s11581-023-05267-6.

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Hosono, Nobuhiko, e Susumu Kitagawa. "Direct observation of porous coordination polymer surfaces by atomic force microscopy". Japanese Journal of Applied Physics, 10 de fevereiro de 2022. http://dx.doi.org/10.35848/1347-4065/ac53ed.

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Abstract Flexible porous coordination polymers (PCPs) and metal–organic frameworks (MOFs) have attracted significant attention as emerging nanoporous materials because their responsive functions have many promising applications in molecular recognition systems and gas storage/separation applications. Flexible PCP/MOFs undergo dynamic structural transformations in response to guest accommodation into the nanopores; here, the outermost surfaces of the PCP/MOFs play a key role in their porous functions. However, the surface structures and behavior in response to external environmental changes are largely unknown due to the limitations of observation techniques. This review provides a brief overview of the surface chemistry and progress of in situ imaging technology as a new tool for the direct visualization of dynamic PCP/MOF surfaces.
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Hosono, Nobuhiko, e Susumu Kitagawa. "Direct observation of porous coordination polymer surfaces by atomic force microscopy". Japanese Journal of Applied Physics, 11 de fevereiro de 2022. http://dx.doi.org/10.35848/1347-4065/ac5427.

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Abstract Flexible porous coordination polymers (PCPs) and metal–organic frameworks (MOFs) have attracted significant attention as emerging nanoporous materials because their responsive functions have many promising applications in molecular recognition systems and gas storage/separation applications. Flexible PCP/MOFs undergo dynamic structural transformations in response to guest accommodation into the nanopores; here, the outermost surfaces of the PCP/MOFs play a key role in their porous functions. However, the surface structures and behavior in response to external environmental changes are largely unknown due to the limitations of observation techniques. This review provides a brief overview of the surface chemistry and progress of in situ imaging technology as a new tool for the direct visualization of dynamic PCP/MOF surfaces.
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25

Ma, Xi, Nan Sun, Zhiguo Li, Minman Tong, Qun Ding, Zhaofeng Wang, Long Bai, Liangliang Dong e Yang Liu. "Highly Flexible and Self‐Standing Covalent Organic Framework–Metal–Organic Framework (COF–MOF) Composite Crystalline Porous Material (CPM) Membrane for Molecular Separation". Advanced Functional Materials, 6 de janeiro de 2024. http://dx.doi.org/10.1002/adfm.202312203.

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AbstractCrystalline porous materials (CPMs), including covalent organic frameworks (COFs) and metal–organic frameworks (MOFs), are promising materials for advanced separation technologies. However, the challenge of transforming nanoscale CPMs into large‐area functional membranes hinders their application in the membrane separation process. Herein, a self‐standing pure COF (TpPa‐1) nanofiber membrane with high crystallinity, good flexibility, excellent mechanical properties, and scalability is prepared using an electrospinning process and polymer sacrificial template strategy. Subsequently, the COF nanofiber membrane is innovatively used to replace traditional inorganic discs, metal meshes, and polymer membranes as porous supports, and the COF–MOF composite CPM membrane is prepared through the tailorable and confined growth of zeolite imidazolium salt frame‐8 (ZIF‐8) on the surface of the COF membrane and in the gaps of the COF nanofibers. The COF–MOF composite membrane exhibits excellent permeability and significantly enhances separation selectivity for organic dyes. Moreover, MOF and COF form an interpenetrating network structure, and their similar chemical properties improve the interfacial stability between the two phases, giving the COF–MOF composite membrane good long‐term separation performance. This is the first self‐standing composite CPM membrane with excellent molecular sieving performance, which provides new insights into the design of high‐performance and robust composite membranes.
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Liu, Xiu-Li, Jia-Wei Guo, Ya-Wen Wang, Ai-Zhu Wang, Xin Yu e Long-Hua Ding. "A flexible electrochemical sensor for paracetamol based on porous honeycomb-like NiCo-MOF nanosheets". Rare Metals, 27 de agosto de 2023. http://dx.doi.org/10.1007/s12598-023-02349-2.

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Mertens, Florian O. "State-dependent gas chromatography based on flexible and tunable porous coordination polymers". Zeitschrift für Naturforschung B, 19 de dezembro de 2024. https://doi.org/10.1515/znb-2024-0087.

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Abstract Gas chromatography can be based on very different types of stationary phase materials such as porous crystalline, polymeric or even liquid materials. These materials are not supposed to change significantly when brought into contact with the analytes to be investigated. Analytes may overload the stationary phase which changes the interaction between analyte and stationary phase causing often tailing or fronting in the detected peaks. In contrast to these unintended effects, new materials such as flexible porous crystalline coordination polymers can be utilized as stationary phase allowing the crystal structure to undergo transformation induced by the analytes. Depending on the analyte concentration, even a complete collaps of the porous structure can be achieved. The generic theoretical investigation presented will address the possible effects caused by state-dependent transformations of stationary phases. A first experimental realization of such a system with a well-known metal-organic framework (MOF) demonstrating unconventional chromatographic behavior was also generated and investigated.
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Zhu, Shaoqing, Aoming Huang, Qian Wang e Ye Xu. "MOF-derived Porous Carbon Nanofibers Wrapping Sn Nanoparticles as Flexible Anodes for Lithium/Sodium Ion Batteries". Nanotechnology, 6 de janeiro de 2021. http://dx.doi.org/10.1088/1361-6528/abd8f8.

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Wang, Chao, Dong-Dong Zhou, You-Wei Gan, Xue-Wen Zhang, Zi-Ming Ye e Jie-Peng Zhang. "A partially fluorinated ligand for two super-hydrophobic porous coordination polymers with classic structures and increased porosities". National Science Review, 8 de maio de 2020. http://dx.doi.org/10.1093/nsr/nwaa094.

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Abstract 3-Ethyl-5-trifluoromethyl-1,2,4-triazole is synthesized by a one-pot reaction. Using this asymmetric triazole ligand bearing one trifluoromethyl and one ethyl as side groups, we construct two new porous coordination polymers, MAF-9 and MAF-2F, being isostructural with the classic hydrophobic and flexible materials, FMOF-1 and MAF-2, based on symmetric triazole ligands bearing two trifluoromethyl groups or two ethyl groups, respectively. MAF-9 and MAF-2F can adsorb large amounts of organic solvents but completely exclude water, showing superhydrophobicity with water contact angles of 152o in between those of FMOF-1 and MAF-2. MAF-9 exhibits very large N2-induced breathing and colossal positive and negative thermal expansions like FMOF-1, but the lower molecular weight and smaller volume of MAF-9 give 16% and 4% higher gravimetric and volumetric N2 uptakes, respectively. In contrast, MAF-2F is quite rigid and does not show the inversed temperature-dependent N2 adsorption and large guest-induced expansion like MAF-2. Further, despite the higher molecular weight and larger volume, MAF-2F possesses 6% and 25% higher gravimetric and volumetric CO2 uptakes, respectively. These results can be explained by the different pore sizes and side group arrangements in the two classic framework prototypes, which demonstrate the delicate roles of ligand side groups in controlling porosity, surface characteristic and flexibility.
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Wang, Zhe, Zhe Lu, Qitong Ye, Zhenbei Yang, Ruojie Xu, Kexin Kong, Yifan Zhang et al. "Construction of Fe Nanoclusters/Nanoparticles to Engineer FeN4 Sites on Multichannel Porous Carbon Fibers for Boosting Oxygen Reduction Reaction". Advanced Functional Materials, 15 de janeiro de 2024. http://dx.doi.org/10.1002/adfm.202315150.

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AbstractFe–N–C catalysts are emerging as promising alternatives to Pt‐based catalysts for the oxygen reduction reaction (ORR), while they still suffer from sluggish reaction kinetics due to the discontented binding affinity between the Fe‐N4 sites and oxygen‐containing intermediates, and unsatisfactory stability. Herein, a flexible multichannel carbon fiber membrane immobilized with atomically dispersed Fe‐N4 sites and neighboring Fe nanoclusters/nanoparticles (FeN4‐FeNCP@MCF) is synthesized. The optimized geometric and electronic structures of the Fe atomic sites brought by adjacent Fe nanoclusters/nanoparticles and hierarchically porous structure of the carbon matrix endow FeN4‐FeNCP@MCF with outstanding ORR activity and stability, considerably outperforming its counterpart with FeN4 sites only and the commercial Pt/C catalyst. Liquid and solid‐state flexible zinc–air batteries employing FeN4‐FeNCP@MCF both exhibit outstanding durability. Theoretical calculation reveals that the Fe nanoclusters can trigger remarkable electron redistribution of the FeN4 sites and modulate the hybridization of central Fe 3d and O 2p orbitals, facilitating the activation of O2 molecules and optimizing the adsorption capacity of oxygen‐containing intermediates on FeN4 sites, and thus accelerating the ORR kinetic. This work offers an effective approach to constructing coupling catalysts that have single atoms coexisting with nanoclusters/nanoparticles for efficient ORR catalysis.
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Tignol, Pierre, Vanessa Pimenta, Anne‐Laurence Dupont, Silvia Carvalho, Abeer Al Mohtar, Maria Inês Severino, Farid Nouar, Moisés L. Pinto, Christian Serre e Bertrand Lavédrine. "A Versatile Shaping Method of Very‐High Loading Porous Solids Paper Adsorbent Composites". Small Methods, 30 de novembro de 2023. http://dx.doi.org/10.1002/smtd.202301343.

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AbstractOwing to their high porosity and tunability, porous solids such as metal–organic frameworks (MOFs), zeolites, or activated carbons (ACs) are of great interest in the fields of air purification, gas separation, and catalysis, among others. Nonetheless, these materials are usually synthetized as powders and need to be shaped in a more practical way that does not modify their intrinsic property (i.e., porosity). Elaborating porous, freestanding and flexible sheets is a relevant shaping strategy. However, when high loadings (>70 wt.%) are achieved the mechanical properties are challenged. A new straightforward and green method involving the combination softwood bleached kraft pulp fibers (S) and nano‐fibrillated cellulose (NFC) is reported, where S provides flexibility while NFC acts as a micro‐structuring and mechanical reinforcement agent to form high loadings porous solids paper sheets (>70 wt.%). The composite has unobstructed porosity and good mechanical strength. The sheets prepared with various fillers (MOFs, ACs, and zeolites) can be rolled, handled, and adapted to different uses, such as air purification. As an example of potential application, a MOF paper composite has been considered for the capture of polar volatile organic compounds exhibiting better performance than beads and granules.
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Parkash, Anand, Nizamuddin Solangi, Sorath Solangi, Sikandar Almani e Suhail Ahmed Soomro. "Synthesis of Porous Carbon-Supported Copper-Based Electrocatalysts Derived from IRMOF: A Non-Noble Metal Electrocatalyst with Optimized Active Sites for the Oxygen Evolution Reaction". Journal of The Electrochemical Society, 22 de abril de 2022. http://dx.doi.org/10.1149/1945-7111/ac6985.

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Abstract Metal-organic frameworks (MOFs) are a type of porous material that offers a highly flexible medium for future broad application due to their crystallinity, structural diversity, and permanent porosity. Herein, by doping copper with Isoreticular metal-organic framework-3 (IRMOF-3) as a precursor, an effective electrocatalyst with x%Cu/IRMOF-3 (x = 1-10 %) porous carbon spheres were prepared and characterized. The oxygen evolution reaction (OER) electrocatalytic properties of x%Cu/IRMOF-3 were investigated. According to the findings, 5%Cu/IRMOF-3-900 has a superior performance with a low overpotential of 265 mV and strong long-term stability in alkaline solution. With a porous structure and high nitrogen content, 5%Cu doped IRMOF-3 is superior to several reported precious metal-free electrocatalysts developed of MOFs. In this research, MOF has been utilized as a template to design a new approach for developing non-noble metal OER catalysts.
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33

Li, Chunyang, Yujian Li, Shaoyan Wu, Gui Li, Juan Li, Yan Zhao, Huan Cai et al. "Flexible Scaffold Modulation of Spatial Structure and Function of Hierarchically Porous Nanoparticle@ZIF‐8 Composites to Enhance Field Deployable Disease Diagnostics". Small Methods, 31 de julho de 2024. http://dx.doi.org/10.1002/smtd.202400738.

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AbstractCatalytic nanoparticle@metal‐organic framework (MOF) composites have attracted significant interest in point‐of‐care testing (POCT) owing to their prominent catalytic activity. However, the trade‐off between high loading efficiency and high catalytic activity remains challenging because high concentrations of nanoparticles tend to cause the misjoining and collapse of the MOFs. Herein, a facile strategy is reported to encapsulate high concentrations of platinum (Pt) nanoparticles into zeolitic imidazolate framework‐8 (ZIF‐8) using polydopamine (PDA) as a support for Pt@ZIF‐8 and as a flexible scaffold for further immobilization of Pt nanoparticles. The resulting composite (Pt@ZIF‐8@PDA@Pt) exhibits ultrahigh Pt nanoparticle loading efficiency, exceptional catalytic activity, stability, and a bright colorimetric signal. Following integration with lateral flow immunoassay (LFIA), the detection limits for pre‐ and post‐catalysis detection of B‐type natriuretic peptide (NT‐proBNP) are 0.18 and 0.015 ng mL−1, respectively, representing a 6‐fold and 70‐fold improvement compared to gold nanoparticle‐based LFIA. Moreover, Pt@ZIF‐8@PDA@Pt‐based LFIA achieves 100% diagnostic sensitivity for NT‐proBNP in a cohort of 184 clinical samples.
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34

Ren, Zhujuan, Shuaishuai Wang, Mengyu Zhu, Kuaibing Wang, Hua Wu e Feifei Mao. "Interwoven Porous Pristine Cobalt‐Based Metal‐Organic Framework as an Efficient Photocatalyst for CO2 Reduction". Small Methods, 27 de novembro de 2024. http://dx.doi.org/10.1002/smtd.202401419.

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AbstractAs a desired utilization of the conversion of CO2 into valuable carbon fuel production under solar energy, it remains challenging due to the lack of efficient catalysts. Herein, a 3D interpenetrating metal‐organic framework of [Co(Tipa)(HCOO)2(H2O)]·H2O (Co‐Tipa) with 1D open channel is solvothermally synthesized using a semi‐flexible ligand (Tipa = tri‐(4‐(1H‐imidazol‐1‐yl)‐phenyl)amine). The tridentate bridge ligand‐oriented periodicity Co‐Tipa MOF is combined with ruthenium‐based photosensitizers under mild reaction conditions to form an efficient nonhomogeneous co‐catalyst for photocatalytic CO2 reduction reaction (CO2RR). As a crystalline MOFs catalyst, the CO production rate, selectivity, and the quantum yield under visible light irradiation offer outstanding performance for the synergistic advantages of structural feature, metal center, and organic ligand. The stability and reusability of the Co‐Tipa co‐catalyst in the reaction system are profited from the robust 3D entangled framework. The mechanism of how to enhance CO2RR performance for the Co‐Tipa is assisted in illustration through density functional theory (DFT) calculations. By leveraging the unique structural properties of entangled MOFs, this study offers innovative approaches for the development of more effective and s Co‐Tipa catalysts that can selectively CO2 into valuable chemicals and fuels.
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Wang, Gang, Hao Chi, Yang Feng, Jie Fan, Nanping Deng, Weimin Kang e Bowen Cheng. "MnF2 Surface Modulated Hollow Carbon Nanorods on Porous Carbon Nanofibers as Efficient Bi‐Functional Oxygen Catalysis for Rechargeable Zinc–Air Batteries". Small, 6 de dezembro de 2023. http://dx.doi.org/10.1002/smll.202306367.

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AbstractDeveloping highly efficient bi‐functional noble‐metal‐free oxygen electrocatalysts with low‐cost and scalable synthesis approach is challenging for zinc–air batteries (ZABs). Due to the flexible valence state of manganese, MnF2 is expected to provide efficient OER. However, its insulating properties may inhibit its OER process to a certain degree. Herein, during the process of converting the manganese source in the precursor of porous carbon nanofibers (PCNFs) to manganese fluoride, the manganese source is changed to manganese acetate, which allows PCNFs to grow a large number of hollow carbon nanorods (HCNRs). Meanwhile, manganese fluoride will transform from the aggregation state into uniformly dispersed MnF2 nanodots, thereby achieving highly efficient OER catalytic activity. Furthermore, the intrinsic ORR catalytic activity of the HCNRs/MnF2@PCNFs can be enhanced due to the charge modulation effect of MnF2 nanodots inside HCNR. In addition, the HCNRs stretched toward the liquid electrolyte can increase the capture capacity of dissolved oxygen and protect the inner MnF2, thereby enhancing the stability of HCNRs/MnF2@PCNFs for the oxygen electrocatalytic process. MnF2 surface‐modulated HCNRs can strongly enhance ORR activity, and the uniformly dispersed MnF2 can also provide higher OER activity. Thus, the prepared HCNRs/MnF2@PCNFs obtain efficient bifunctional oxygen catalytic ability and high‐performance rechargeable ZABs.
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