A5049511206- Membrane Separation and Gas Transport
- Metal-Organic Frameworks: Synthesis and Applications
- Covalent Organic Framework Applications
- Membrane Separation Technologies
- Membrane-based Ion Separation Techniques
- Fuel Cells and Related Materials
- Carbon Dioxide Capture Technologies
- Catalytic Processes in Materials Science
- Graphene research and applications
- X-ray Diffraction in Crystallography
- Catalysts for Methane Reforming
- Crystallization and Solubility Studies
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- MXene and MAX Phase Materials
- Metal-Catalyzed Oxygenation Mechanisms
- Conducting polymers and applications
- Advanced Photocatalysis Techniques
- Bioactive Compounds and Antitumor Agents
- Catalysis and Hydrodesulfurization Studies
- Advanced Sensor and Energy Harvesting Materials
- Carbon dioxide utilization in catalysis
- Magnetism in coordination complexes
- Morinda citrifolia extract uses
Tianjin University
2018-2025
Lawrence Berkeley National Laboratory
2021-2025
Energy Storage Systems (United States)
2025
University of California, Berkeley
2021-2024
Ningbo University
2024
Unité Matériaux et Transformations
2022-2024
Ji Hua Laboratory
2022
Collaborative Innovation Center of Chemical Science and Engineering Tianjin
2018-2022
Aqueous two-phase system features with ultralow interfacial tension and thick region, affording unique confined space for membrane assembly. Here, the first time, an aqueous assembly method is proposed to fabricate covalent organic framework (COF) membranes. The solution containing polyethylene glycol dextran undergoes segregated phase separation into two water-rich phases. By respectively distributing aldehyde amine monomers phases, a series of COF membranes are fabricated at water-water...
Ultrathin covalent organic framework (COF) membranes are urgently demanded in molecular/ionic separations. Herein, we reported an electrochemical interfacial polymerization strategy to fabricate ultrathin COF with thickness of 85 nm, by actively manipulate self-healing effect and self-inhibiting effect. The resulting membrane exhibited superior performance brine desalination the permeation flux 92 kg m-2 h-1 rejection 99.96 %. Our enriches fabrication approach facilitates rational design membranes.
Abstract Fabricating ultrathin covalent organic framework (COF) membranes toward high‐permeance molecular separations is highly desired yet challenging. Herein, a polyelectrolyte‐mediated assembly (PMA) strategy developed to fabricate ionic COF membrane for efficient CO 2 separation. The PMA allows facile control over the mode between polyethyleneimine (PEI) and TpPa‐SO 3 H, yielding PEI‐bridged ultra‐large nanosheets which are readily processed into with thickness down 8 nm. resulting...
We report a covalent organic framework (COF) induced seeding strategy to fabricate metal-organic (MOF) membranes. Contrary graphene oxide nuclei-depositing substrate, COF substrate has uniform pore size, high microporosity and abundant functional groups. designed series of charged nanosheets induce the formation ZIF-8@COF nanosheet seeds with aspect ratio over 150, which were readily processed into compact seed layer. The resulting ZIF-8 membranes thickness down 100 nm exhibit an ultrahigh...
Diamine-appended Mg2(dobpdc) (dobpdc4– = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate) metal–organic frameworks are promising candidates for carbon capture that exhibit exceptional selectivities and high capacities CO2. To date, CO2 uptake in these materials has been shown to occur predominantly via a chemisorption mechanism involving insertion at the amine-appended metal sites, limits capacity of material ∼1 equiv per diamine. Herein, we report new framework, pip2–Mg2(dobpdc) (pip2...
Carbon capture at fossil fuel-fired power plants is a critical strategy to mitigate anthropogenic contributions global warming, but widespread deployment of this technology hindered by lack energy-efficient materials that can be optimized for CO
In nature, nonheme iron enzymes use dioxygen to generate high-spin iron(IV)=O species for a variety of oxygenation reactions. Although synthetic chemists have long sought mimic this reactivity, the enzyme-like activation O2 form iron(IV) = O remains an unrealized goal. Here, we report metal-organic framework featuring iron(II) sites with local structure similar that in α-ketoglutarate-dependent dioxygenases. The reacts at low temperatures are characterized using situ diffuse reflectance...
Covalent organic framework (COF) materials have been considered as disruptive membrane for gas separation. The dominant one-step method COF nanosheet synthesis often suffers from coupling among polymerization, assembly and crystallization processes. Herein, we propose a two-step comprising step functional group switching to synthesize nanosheets the corresponding membranes. In first step, pristine COF-316 bearing cyano groups are prepared via interfacial polymerization. second in were...
Abstract Synthesis of covalent organic framework nanosheets (CONs) with high aspect ratio is crucial to their assembly into advanced membranes. Nonetheless, the π‐π stacking between (COF) layers often leads thick CONs. Herein, inspired by biomineralization process, a series CONs >15 000 synthesized multifunctional polyelectrolytes which not only provide nucleation sites for pre‐assembly COF monomer, but also suppress interaction anisotropic growth through protonation. The membrane...
Diamine-appended Mg2(dobpdc) (dobpdc4– = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate) metal–organic frameworks have emerged as promising candidates for carbon capture owing to their exceptional CO2 selectivities, high separation capacities, and step-shaped adsorption profiles, which arise from a unique cooperative mechanism resulting in the formation of ammonium carbamate chains. Materials appended with primary,secondary-diamines featuring bulky substituents, particular, exhibit excellent...
Fabricating covalent organic framework (COF) membranes through the pre-assembly of nanosheets with different properties may open a novel avenue to fabrication advanced 2D membranes. Herein, COF are fabricated using oppositely-charged (CONs). Negatively-charged CONs and positively-charged pre-assembled simple physical mixing, yielding an aspect ratio exceeding 10 000, which assembled into three kinds The optimal exhibit highest desalination performance permeation flux 132.66 kg m
Developing all-solid-state electrolytes, the chips for lithium-metal batteries, with superior electrochemical and mechanical properties awaits disruptive materials. Herein, ionic covalent organic framework membranes are explored as solid-state electrolytes single Li
Abstract Hydrogen‐bonded organic frameworks (HOFs) feature a highly ordered pore structure, abundant functional groups, and unique solution‐processability, holding great promise in gas separations. In this study, we explored the fabrication of HOF membranes utilizing dispersion‐controlled deposition (DCD) method. To achieve homogeneous dispersion, bulk aggregates were initially dispersed solvent then switched to anti‐solvent generate precipitated nanoparticles. Under vacuum‐assisted...
The eco-friendly processing of conjugated polymer binder for lithium-ion batteries demands improved solubility by introducing functional moieties, while this strategy will concurrently sacrifice conductivity. Employing the polyfluorene-based poly(2,7-9,9 (di(oxy-2,5,8-trioxadecane))fluorene) (PFO), soluble in water-ethanol mixtures, a novel approach is presented to solve trade-off, which features integration aqueous solution with subsequent controlled thermal-induced cleavage solubilizing...