A5041138101- Zeolite Catalysis and Synthesis
- Organometallic Complex Synthesis and Catalysis
- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Mesoporous Materials and Catalysis
- Synthetic Organic Chemistry Methods
- Carbon Nanotubes in Composites
- Carbon dioxide utilization in catalysis
- Advanced NMR Techniques and Applications
- Asymmetric Hydrogenation and Catalysis
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysts for Methane Reforming
- Catalysis and Hydrodesulfurization Studies
- Graphene research and applications
- Covalent Organic Framework Applications
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Membrane Separation and Gas Transport
- X-ray Diffraction in Crystallography
- Organoboron and organosilicon chemistry
- Catalytic Cross-Coupling Reactions
- Membrane Separation Technologies
- Polyoxometalates: Synthesis and Applications
- Crystallization and Solubility Studies
- Ammonia Synthesis and Nitrogen Reduction
King Abdullah University of Science and Technology
2016-2025
Core Laboratories (United States)
2018-2021
Kootenay Association for Science & Technology
2020
Université de Montpellier
2005-2013
Centre National de la Recherche Scientifique
2005-2011
Umeå University
2010-2011
Laboratoire Charles Coulomb
2011
Institut de Physique
2007
University of Pennsylvania
2007
Sulfurized polyacrylonitrile (SPAN) is the most promising cathode for next-generation lithium–sulfur (Li–S) batteries due to much improved stability. However, molecular structure and reaction mechanism have not yet been fully understood. Herein, we present a new take on interpret electrochemical behaviors. We find that thiyl radical generated after cleavage of S–S bond in molecules first cycle, then conjugative can be formed electron delocalization pyridine backbone. The react with lithium...
Aqueous zinc-ion batteries and capacitors are potentially competitive grid-scale energy storage devices because of their great features such as safety, environmental friendliness, low cost. Herein, a completely new phenanthroline covalent organic framework (PA-COF) was synthesized introduced in supercapatteries (ZISs) for the first time. Our as-synthesized PA-COF shows high capacity 247 mAh g–1 at current density 0.1 A g–1, with only 0.38% decay per cycle during 10 000 cycles 1.0 g–1....
Abstract Covalent organic frameworks (COFs) are potentially promising electrode materials for electrochemical charge storage applications thanks to their pre‐designable reticular chemistry with atomic precision, allowing precise control of pore size, redox‐active functional moieties, and stable covalent frameworks. However, studies on the mechanistic practical aspects zinc‐ion behavior still limited. In this study, a strategy enhance performance COF cathodes in batteries (ZIBs) by...
The direct transformation of CO2 into high-value-added hydrocarbons (i.e., olefins and aromatics) has the potential to make a decisive impact in our society. However, despite efforts scientific community, no synthetic route exists today synthesize aromatics from with high productivities low undesired CO selectivity. Herein, we report combination series catalysts comprising potassium superoxide doped iron oxide highly acidic zeolite (ZSM-5 MOR) that directly convert either light (in or ZSM-5)...
Photoactive metal-organic frameworks (MOFs) represent one of the most promising materials for photocatalytic hydrogen production, but phosphonate-based MOFs have remained largely underdeveloped compared to other conventional MOFs. Herein, a photocatalyst 1D titanium phosphonate MOF is designed through an easy and scalable stirring hydrothermal method. Homogeneous incorporation organophosphonic linkers can narrow bandgap, which due strong electron-donating ability OH functional group that...
Abstract New covalent organic frameworks (COFs), encompassing redox‐functionalized moieties and an aza‐fused π‐conjugated system, are designed, synthesized, deployed as negative electrodes in asymmetric supercapacitors (ASC), for the first time. The Hex‐Aza‐COFs synthesized based on solvothermal condensation reaction of cyclohexanehexone aromatic tetramines with benzoquinone (Hex‐Aza‐COF‐2) or phenazine (Hex‐Aza‐COF‐3). show a specific capacitance 585 F g −1 Hex‐Aza‐COF‐2 663 Hex‐Aza‐COF‐3...
Solid-state electrolytes with high Li+ conductivity, flexibility, durability, and stability offer an attractive solution to enhance safety energy density. However, meeting these stringent requirements poses challenges the existing solid polymeric or ceramic electrolytes. Here, electrolyte-mediated single-Li+ -conductive covalent organic framework (COF) is presented, which represents a new category of quality solid-state conductors. In situ solidification tailored liquid electrolyte boosts...
The design of materials and their manufacture into membranes that can handle industrial conditions separate complex nonaqueous mixtures are challenging. We report a versatile strategy to fabricate polytriazole with 10-nanometer-thin selective layers containing subnanometer channels for the separation hydrocarbons. process involves use classical nonsolvent-induced phase method thermal cross-linking. membrane selectivity be tuned lower end typical nanofiltration range (200 1000 gram mole −1 )....
Abstract Nanoporous graphitic carbon membranes with defined chemical composition and pore architecture are novel nanomaterials that actively pursued. Compared easy-to-make porous powders dominate the research applications in energy generation/conversion environmental remediation, synthetically more challenging though rather appealing from an application perspective due to their structural integrity, interconnectivity purity. Here we report a simple bottom–up approach fabricate large-size,...
2D membrane with azobenzene switches has the photo-responsive pores for nanofiltration.
Recent discoveries highlighted the activity and intriguing mechanistic features of NbCl5 as a molecular catalyst for cycloaddition CO2 epoxides under ambient conditions. This has inspired preparation novel silica-supported Nb species by reacting niobium precursor, [NbCl5·OEt2], with silica dehydroxylated at 700 °C (SiO2-700) or 200 (SiO2-200) to generate diverse surface complexes. The product reaction between SiO2-700 [NbCl5·OEt2] was identified monopodal supported species, [≡SiONbCl4·OEt2]...
Copper-based nanomaterials have attracted tremendous interest due to their unique properties in the fields of photoluminescence and catalysis. As a result, studies on correlation between molecular structure are great importance. Copper nanoclusters new class that can provide an atomic-level view crystal copper nanoparticles. Herein, high-nuclearity nanocluster with 81 atoms, formulated as [Cu81(PhS)46(tBuNH2)10(H)32]3+ (Cu81), was successfully synthesized fully studied by X-ray...
Although core–shell copper metal nanoclusters are important emerging materials for practical applications and fundamental scientific research, their synthesis lags behind that of gold silver nanoclusters–challenged by copper's much lower half-cell reduction potential, M(I)/M(0). To overcome this synthetic hurdle, we introduce a simple reaction strategy, involving the mild reducing agent borane tert-butylamine complex, to produce superatom nanocluster, [Cu61(StBu)26S6Cl6H14]+ (−StBu;...
A systematic molecular level and spectroscopic investigation is presented to show the cooperative role of Brønsted acid Lewis sites in zeolites for conversion methanol. Extra-framework alkaline-earth metal containing species aluminum decrease number sites, as protonated clusters are formed. combined experimental theoretical effort shows that postsynthetically modified ZSM-5 zeolites, by incorporation extra-framework metals or demetalation with dealuminating agents, contain both mononuclear...
Abstract Cascade processes are gaining momentum in heterogeneous catalysis. The combination of several catalytic solids within one reactor has shown great promise for the one-step valorization C1-feedstocks. metal-based catalysts and zeolites gas phase hydrogenation CO 2 leads to a large degree product selectivity control, defined mainly by zeolites. However, deal mechanistic understanding remains unclear: usually lead complex compositions that may result unexpected zeolite reactivity. Here...
The production of 1-butene by ethylene dimerization is an important chemical industrial process currently implemented using homogeneous catalysts. Here, we describe a highly active heterogeneous catalyst (Ni-ZIF-8) for dimerization, which consists isolating Ni-active sites selectively located on the crystal surface zeolitic imidazolate framework. Ni-ZIF-8 can be easily prepared simple one-pot synthesis method in site-specific anchoring Ni achieved spontaneously because incompatibility...
We report here an accurate surface organometallic chemistry (SOMC) approach to propane oxidative dehydrogenation (ODH) using a μ2-oxo-bridged, bimetallic [V2O4(acac)2] (1) (acac = acetylacetonate anion) complex as precursor. The identity and the nuclearity of product grafting subsequent treatment have been systematically studied by means FT-IR, Raman, solid-state (SS) NMR, UV–vis DRS, EPR EXAFS spectroscopies. show that 1 on silica under rigorous SOMC protocol thermal lead exclusively...
The synthesis and full characterization of a well-defined silica-supported ≡Si-O-W(Me)5 species is reported. Under an inert atmosphere, it stable material at moderate temperature, whereas the homoleptic parent complex decomposes above -20 °C, demonstrating stabilizing effect immobilization molecular complex. Above 70 °C grafted converts into two methylidyne surface complexes [(≡SiO-)W(≡CH)Me2] [(≡SiO-)2W(≡CH)Me]. All these are active precursors for propane metathesis reactions.
The dynamic catalytic site on Mo/HZSM-5 for methane dehydroaromatization is formed during the initial phases of reaction. Labelling experiments show that carbon from carbidic active incorporated into final products.