A5034094757- Radioactive element chemistry and processing
- Hydrocarbon exploration and reservoir analysis
- Enhanced Oil Recovery Techniques
- Petroleum Processing and Analysis
- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Metal Extraction and Bioleaching
- Higher Education Research Studies
- Ammonia Synthesis and Nitrogen Reduction
- Advancements in Battery Materials
- Advanced battery technologies research
- Spectroscopy and Quantum Chemical Studies
- Advanced Photocatalysis Techniques
- Fuel Cells and Related Materials
- Medical Education and Admissions
- Pesticide Residue Analysis and Safety
- Electrochemical Analysis and Applications
- Garlic and Onion Studies
- Thermal Expansion and Ionic Conductivity
- Indoor Air Quality and Microbial Exposure
- Industrial Gas Emission Control
- Quinazolinone synthesis and applications
- Graphene and Nanomaterials Applications
- Mass Spectrometry Techniques and Applications
- Iron oxide chemistry and applications
Myongji University
2025
Korea Institute of Science and Technology
2022-2025
University of Michigan
2009-2022
Ann Arbor Center for Independent Living
2021
Dongguk University
2016
National Institute of Food and Drug Safety Evaluation
2015
Ministry of Food and Drug Safety
2015
Kyung Hee University
2015
Seoul National University
2011-2012
Office of Management
2009
The two-electrons (2e–) oxygen reduction reaction (ORR) offers a sustainable and decentralized alternative to the traditional synthetics for hydrogen peroxide (H2O2) production. Although various Co single atom catalysts (SACs) have been proposed as highly effective 2e– ORR catalysts, there is still room improvement through fine-tuned coordination environment. Here, Co-N5-O-C with combination of coordinated Co-N5 moieties nearby electro-withdrawing epoxides first time developed reach optimal...
Abstract Atomically dispersed single‐atom catalysts (SACs) on carbon supports show great promise for H 2 O electrosynthesis, but conventional wet chemistry methods using particulate blacks in powder form have limited their potential as two‐electron (2e − ) oxygen reduction reaction (ORR) catalysts. Here, we demonstrate high‐performance Co SACs supported a free‐standing aligned nanofiber (CNF) electrospinning and arc plasma deposition (APD). Based the surface oxidation treatment of CNF...
Abstract Hydrogen peroxide (H 2 O ) electrosynthesis via the 2e − oxygen reduction reaction (ORR) is considered as a cost‐effective and safe alternative to energy‐intensive anthraquinone process. However, in more practical environments, namely, use of neutral media air‐fed cathode slow ORR kinetics insufficient supply pose significant challenges efficient H production at high current densities. In this work, mesoporous B‐doped carbons with novel curved B 4 C active sites, synthesized carbon...
Lithium ternary halides are promising solid electrolytes, owing to their high ionic conductivity and reasonably oxidative chemical stability. Recently, fluorine substitution in Li3MCl6 has been suggested as a approach for further enhancing oxidation Accordingly, this study outlines material design strategy F-substituted through systematic theoretical analyses. Calculations reveal that the mixing limit of F Li3MCl6–xFx is range 0.5–1.5, resulting phases can retain above 1 mS/cm up x = 1.0....
Nitrogen-containing odorous compounds (NOCs) such as ammonia, ethylamine, dimethylamine, and trimethylamine (TMA) have potentially adverse effects on the environment human health. An efficient simple strategy for NOC removal is necessary. Herein, thermally dried activated carbon adsorbents (TDACs) were prepared, their surfaces subjected to controlled thermal oxidation at 50, 100, 200 °C. The resulting TDACs exhibited micropore-intensive porous structures with different specific surface areas...
Oil extraction efficiency strongly depends on the wettability status (oil- vs water-wet) of reservoir rocks during oil recovery. Aromatic compounds with polar functional groups in crude have a significant influence binding hydrophobic molecules to mineral surfaces. Most these are asphaltene fraction oil. This study focuses hydroxyl group, an identified group asphaltenes, understand how interactions between asphaltenes and surfaces begin. Phenol 1-naphthol used as surrogates model simplest...
Using literature and illustrations drawn from a pilot study, this article explores the theoretical methodological challenges entailed in study of student retention. We center discussion around two important efforts to expand base scope for research area: Berger's (2000) concept colleges universities as optimizers cultural capital Bensimon's (2007) recent critique narrowness frames that predominate retention research. By way exploring these issues through concrete example, presents an...
Hydroxide ions that are initially buried within an ice film segregate to the surface at elevated temperatures. This process was observed by conducting experiments with constructed a bottom H2O layer and upper D2O layer, excess of hydroxide trapped H2O/D2O interface as they were generated Na hydrolysis. The transport from interfacial examined function time using low energy sputtering method. progress H/D exchange reaction in water molecules also monitored Cs+ reactive ion scattering...
We studied the transport of hydronium, chloride, and water in an ice film at 140–180 K, a temperature range that encompasses onset sublimation, crystallization, roughening transition film. The was grown vacuum to have structure bottom H2O layer, upper D2O hydronium chloride ions embedded H2O/D2O interface, with total sample thickness ≥100 BL. from interface layer surface monitored as function using low energy sputtering (LES) method. molecules their H/D exchange reactions were Cs+ reactive...
Mineral wettability and alteration are important factors that determine the distribution mobility of oil during recovery process. Because is dependent on many (e.g., hydrocarbon composition, mineralogy, pH), predicting mineral often difficult. The goal this study to look at changes occur itself, specifically in surface structure potential, using experimental methods complemented by quantum-mechanical calculations better understand molecular-level processes involved alteration. Nanoscale...
Ethylenediaminetetraacetic acid (EDTA), a strong complexing agent, is common constituent of liquid nuclear waste streams. The interaction EDTA or other organic inorganic ligands with uranyl enhances the mobilization uranium and therefore significantly influences disposal remediation waste. Although numerous studies have focused on effect environmental uranium, including adsorption redox reactions mineral surfaces, few differentiated reaction-controlling steps (diffusion, adsorption, chemical...
A tremendous amount of ammonia (NH3) has been produced by the Haber-Bosch method during last 100 years. However, it is imperative to develop a new alternative produce NH3 in more environmentally friendly way due high energy cost and large greenhouse gas emissions method. Although mechanochemical process regarded as an emerging technique, understanding at atomic level limited. Here, we computationally model ball-milling molecular dynamics simulations with reactive force field (ReaxFF)...
Surface-active compounds, primarily in asphaltene fractions of crude oil, are responsible for binding the nonpolar oil components to mineral surfaces and, therefore, control wettability changes on reservoir rock/mineral surfaces. Surface occur mainly through polar functional groups these such as hydroxyl, carboxyl, or carbonyl. By using with its fraction removed, so-called maltenes, we investigate effect hydroxyl and carboxyl calcite Atomic force microscopy (AFM) images show significantly...
Surface diffusion can bring redox pairs closer together, which is necessary for electron transfer to happen, thereby strongly influencing the overall kinetics. However, little known about kinetics of redox-active species on pyrite and other sulfides, aid in catalyzing many reactions. Here, we calculate oxidant (UO22+) reductant (Fe2+, HS–) {100} surfaces using quantum-mechanical calculations. Energy curves along different paths are derived both inner- outer-sphere complexes by moving small...
Abstract Reaktion des Dipyridylcarbonats (I) mit den Diolen (II) und (VI), Aminoalkoholen (VIII) sowie o‐Aminophenolen (X) liefert in hohen Ausbeuten die cyclischen Carbonate (III) bzw. (VII) Oxazolidone (IX) (XI).
The redox kinetics of actinyl (An(<sc>v</sc>/<sc>vi</sc>)O<sub>2</sub><sup>+/2+</sup>)–EDTA (An = U, Np, and Pu) by ferrous iron are calculated using quantum-mechanical calculations under both circumneutral acidic conditions. EDTA complexation does not prohibit but slow down the reduction actinyl–EDTA iron.
Design strategies for core–shell or multilayered electrochemical NRR catalysts are suggested based on high-throughput DFT calculations of transition-metal catalysts.