Dae‐Woon Lim 교수

Hexagonal-disk-shaped magnesium nanocrystals (MgNCs) are fabricated within a porous metal-organic framework (MOF, see picture). The MgNCs@MOF stores hydrogen by both physi- and chemisorptions, exhibiting synergistic effects to decrease the isosteric heat of H(2) physisorption compared with that of pristine MOF, and decrease the H(2) chemisorption/desorption temperatures by 200 K compared with those of bare Mg powder.

To develop a metal-organic framework (MOF) for hydrogen storage, SNU-200 incorporating a 18-crown-6 ether moiety as a specific binding site for selected cations has been synthesized. SNU-200 binds K(+), NH4(+), and methyl viologen (MV(2+)) through single-crystal to single-crystal transformations. It exhibits characteristic gas-sorption properties depending on the bound cation. SNU-200 activated with supercritical CO2 shows a higher isosteric heat (Qst) of H2 adsorption (7.70 kJ mol(-1)) than oth

Highly stable superprotonic conductivity (>10^-2 S cm^-1) has been achieved through the unprecedented <i>solvent-free-</i>coordinative urea insertion in MOF-74 [M₂(dobdc), M = Ni²⁺, Mg²⁺; dobdc = 2,5-dioxido-1,4-benzenedicarboxylate] without an acidic moiety. The urea is bound to open metal sites and alters the void volume and surface functionality, which triggers a significant change in proton conductivity and diffusion mechanism. Solid-state

Proton conductivity has been traditionally investigated with various materials such as organic polymers, metal oxides, and other inorganic and organic compounds because of their potential application in the electrochemical devices. In particular, during the last decade, crystalline porous coordination polymers (PCPs) or metal-organic frameworks (MOFs) have received considerable attention in recent years, as solid-state proton conductors (SSPCs). To date, proton-conductive MOFs have achieved high

Void space and functionality of the pore surface are important structural factors for proton-conductive metal-organic frameworks (MOFs) impregnated with conducting media. However, no clear study has compared their priority factors, which need to be considered when designing proton-conductive MOFs. Herein, we demonstrate the effects of void space and pore-surface modification on proton conduction in MOFs through the surface-modified isoreticular MOF-74(Ni) series [Ni₂ (dobdc or dobpdc)

Hexagonale Magnesium-Nanokristallplättchen (MgNCs) wurden in einem porösen Metall-organischen Gerüst (MOF, siehe Bild) erzeugt. Das MgNC@MOF-Komposit speichert Wasserstoff durch Physi- und Chemisorption; dabei setzt es die isostere Wärme der H2-Physisorption sowie die H2-Chemisorptions-/Desorptions-Temperaturen deutlich herab.

Abstract To develop a metal–organic framework (MOF) for hydrogen storage, SNU‐200 incorporating a 18‐crown‐6 ether moiety as a specific binding site for selected cations has been synthesized. SNU‐200 binds K + , NH 4 + , and methyl viologen(MV 2+ ) through single‐crystal to single‐crystal transformations. It exhibits characteristic gas‐sorption properties depending on the bound cation. SNU‐200 activated with supercritical CO 2 shows a higher isosteric heat ( Q st ) of H 2 adsorption (7.70 kJ mol

The unprecedented ternary nanocomposites have been synthesized as a single platform via cross-linking of two nanoporous materials, MOFs and Pt nanoparticle (NP) loaded zeolite. The heterojunction of the novel nanocomposites is anticipated to work as a chemical platform for size selective catalytic hydrogenation or deuteration of small molecules.

Ionic conduction in highly designable and porous metal-organic frameworks has been explored through the introduction of various ionic species (H⁺ , OH^- , Li⁺ , etc.) using post-synthetic modification such as acid, salt, or ionic liquid incorporation. Here, we report on high ionic conductivity (σ>10^-2 S cm^-1 ) in a two-dimensionally (2D)-layered Ti-dobdc (Ti₂ (Hdobdc)₂ (H₂ dobdc), H₄ dobdc: 2,5-dihy

This study reports moisture-triggered proton-conductivity switching behavior in Zn 5 FDC MOFs, [Zn 5 (μ 3 -OH) 2 (FDC) 4 (solvent) 2 ] (FDC = 9 H -fluorene-2,7-dicarboxylate), induced by the presence and absence of coordinating solvents.

Design of solid-state proton conductors (SSPCs) operating at low to intermediate temperatures (25–60 °C) is desirable to address the thermal-management issue in proton-exchange membrane fuel cells (PEMFCs). Among the various approaches in designing SSPCs, “orthophosphate coordination” is highly unexplored in MOFs. Herein, a new MOF: IITKGP-103 {[Ag(hmta)H2PO4]·2H2O}n with orthophosphate coordinated to Ag(I) center, is rationally designed. Synchronous alignments of two amphiprotic proton sources/

Ammonia is useful for the production of fertilizers and chemicals for modern technology, but its high toxicity and corrosiveness are harmful to the environment and human health. Here, we report the recyclable and tunable ammonia adsorption using a robust imidazolium-based MOF (JCM-1) that uptakes 5.7 mmol g^-1 of NH₃ at 298 K reversibly without structural deformation. Furthermore, a simple substitution of NO₃ ^- with Cl^- in a post-synthetic ma

Metal–organic materials (MOMs) are receiving widespread interest for use in many energy-related applications due to their tunable structure attained by the deliberate selection of metal and ligand components and their associated structure–property relationships. In this work, we demonstrate the dimensional crossover of discrete metal–organic polyhedra, CuMOP-3 (0-D, [Cu24(5-sip)24(S)24]·xS; 5-sip = 5-sulfoisophthalic acid, C8O7H5S), into Cu-based coordination polymers, CuCP-1 (2-D, [Cu(Im)4·Cu2(

In this paper, we introduce a new partial transmit sequence (PTS) orthogonal frequency division multiplexing (OFDM) scheme with low computational complexity. In the proposed scheme, 2/sup n/ - point inverse fast Fourier transform (IFFT) is divided into two parts. An input symbol sequence is partially transformed using the first l stages of IFFT to generate an intermediate signal sequence and the intermediate signal sequence is partitioned into a number of intermediate signal subsequences. Then,

Molecular confinement within a limited space induces unique behaviour not seen in bulk systems. In particular, the proton diffusion in conducting medium under confined conditions is significantly affected by the surrounding environment.H2O, efficient conducting medium, confined in hydrophobic channels forms unique clusters allowing rapid diffusion, whereas confined NH3, having a similar degenerate system (Fig. 1a), has not been reported. Herein, we show NH3-mediated proton conduction in micropor