A5089198254- Electrocatalysts for Energy Conversion
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Metallurgical Processes and Thermodynamics
- Molten salt chemistry and electrochemical processes
- Metal-Organic Frameworks: Synthesis and Applications
- Radioactive element chemistry and processing
- Nanoporous metals and alloys
- Electrochemical sensors and biosensors
- Nuclear reactor physics and engineering
- Nanomaterials for catalytic reactions
- Magnetism in coordination complexes
- Gold and Silver Nanoparticles Synthesis and Applications
- Electrodeposition and Electroless Coatings
- Anodic Oxide Films and Nanostructures
- Polyoxometalates: Synthesis and Applications
- Nuclear Materials and Properties
- Nanomaterials and Printing Technologies
- Extraction and Separation Processes
- Chemical Synthesis and Characterization
- Advanced Nanomaterials in Catalysis
- Advancements in Solid Oxide Fuel Cells
- Mesoporous Materials and Catalysis
Korea Atomic Energy Research Institute
2022-2024
Chungbuk National University
2012-2019
Environmental damage from serious nuclear accidents should be urgently restored, which needs the removal of radioactive species. Radioactive iodine isotopes are particularly problematic for human health because they released in large amounts and retain radioactivity a substantial time. Herein, we prepare platinum-coated iron nanoparticles (Fe@Pt) as highly selective reusable adsorbent species, i.e., iodide (I-), (I2), methyl (CH3I). Fe@Pt selectively separates species seawater groundwater...
This paper reports the findings of our efforts toward gaining a more complete understanding and utilization galvanic replacement reactions involving manganese oxide with noble metals. It was revealed that site metal deposition is significantly affected by variable oxidation state oxide. The use carbon-encapsulated MnO nanoparticles as reaction template led to growth specifically on outermost surfaces carbon shells rather than cores, which allowed for selective decoration external hollow...
We report a simple one-step electrodeposition of triangular Pd rod nanostructures on clean Au substrates without additives. Scanning electron microscopy, transmission and electrochemical techniques were utilized to characterize the structural features nanostructures. The regulation rate by optimizing electrolyte concentration applied potential was critical for anisotropic growth in vertical direction. structures exhibited electrocatalytic activities oxygen reduction methanol oxidation...
The characteristic properties of metal surfaces, i.e., wettability and surface-enhanced Raman scattering (SERS) activity, have been the subject intensive research because their useful applications. In present work, we report a simple electrodeposition nanoflake Pd structures onto clean Au surfaces without use additives. fine structure was regulated by controlling deposition charge, effect structural variations on SERS activity examined. in terms water contact angle closely related to...
Radical-ionic metal-organic frameworks (MOFs) have unique optical, magnetic, and electronic properties. These radical ions, forcibly formed by external stimulus-induced redox processes, are structurally unstable short lifetimes. Here, we report two naphthalenediimide-based (NDI-based) Ca-MOFs: DGIST-6 DGIST-7. Neutral DGIST-6, which is generated first during solvothermal synthesis, decomposes converted into radical-anionic Cofacial (NDI)2•- (NDI)22- dimers effectively stabilized in DGIST-7...
The exploitation of nanoconfined conversion Au- and Pt-containing binary nanocrystals for developing a controllable synthesis surfactant-free AuPt with enhanced formic acid oxidation (FAO) activity is reported, which can be stably evenly immobilized on various support materials to diversify optimize their electrocatalytic performance. In this study, an atomic layer Pt(2+) species discovered spontaneously deposited in situ the Au nanocrystal generated from reverse-microemulsion solution....
Designing and synthesizing noble metal nanostructures with tunable porosity nanoscopic intricacies is crucial for highly augmented surface properties as gateway to the wide range of applications. Here, we develop a pore-engineered nanoreactor (PENR)-based approach toward synthesis porous platinum nanodendrites (PtNDs) "yolk-in-shell" "shell-in-shell" morphologies nanoscale porosity. In our strategy, first, various silica-based PENRs variable each containing single Au seed were synthesized by...
Pd@Pt core-shell nanocubes with a partially covered Pt shell on the Pd were synthesized by direct seed-mediated growth method without washing process. The FAO activity of 0.4 at% was 4.3 times and 2.2 higher than that cubes commercial Pt/C, respectively.
A novel reverse microemulsion strategy was developed to asymmetrically encapsulate metal-oxide nanoparticles in silica by exploiting the self-catalytic growth of aminosilane-containing at a single surface site. This produced various colloidal Janus nanoparticles, including Au/Fe3O4@asy-SiO2, which were converted an Au-containing nanosphere, Au@con-SiO2, reductive Fe3O4 dissolution. The use Au@con-SiO2 as metal-growing nanoreactor allowed templated synthesis noble-metal nanocrystals, hollow...
The electrooxidation of formic acid (FA) on Pt has received great attention because its fundamental significance as a model reaction and technical importance in fuel cells. layers modified Au surfaces were recently reported to exhibit enhanced electrocatalytic activity for FA oxidation; however, the mechanistic details have not been clearly elucidated. In this work, mechanism was investigated via situ electrochemical surface-enhanced Raman scattering (SERS). SERS-active DAR@Pt(n) substrates...
Carbon thin-layer-coated manganese-oxide nanocrystals as an effective support for high-performance Pt electrocatalysts stabilized at a metal–metal oxide–carbon triple junction.
The preparation of nanoporous gold ( NPG ) has been the subject extensive research, and anodization Au in chloride solutions received recent attention as an efficient time‐saving method. In present work, effects reaction temperature Cl – concentration on anodic formation structures were investigated. efficiency was evaluated terms roughness factor R f layers, which varied a function these two parameters. gradually increased with up to 40 °C then leveled off at higher temperatures....
Determining the phase-transition temperature is crucial in design of molten salt reactors, as operational temperatures need to be established considering safety margins related thermodynamic stability system. This study introduces a novel approach determine based on rapid electrical conductivity measurements using microsecond-scale staircase voltammetry technique. spans range covering solidus and liquidus ionic compound mixtures. The determined near distinct points where abruptly changes,...
Determining the phase-transition temperature is crucial in design of molten salt reactors, as operational temperatures need to be established considering safety margins related thermodynamic stability system. This study introduces a novel approach determine based on rapid electrical conductivity measurements using microsecond-scale staircase voltammetry technique. The determined near distinct points where abruptly changes, indicating phase transitions. three LiCl–KCl systems, proposed...
The epsilon particles that result from UO2 fuel nuclear fission possess both advantages and disadvantages a spent (SNF) management perspective. In this study, the effect of particles, namely Ru, Mo, Pd, inherent in simulated pellets is examined. Various analytical methods have been used to explore changes structural, surface, electrochemical properties which contain particles. A notable finding are not evenly distributed tend clump together, transforming into metallic state after sintering,...
The nanospace-confined solid-sate conversion of Au- and Pt-containing binary nanocrystals is exploited by J. Kim, I. S. Lee, co-workers for the development a controllable synthesis surfactant-free AuPt with enhanced formic acid oxidation activity, which can be stably evenly immobilized on various support materials to diversify optimize their electrocatalytic performance. On page 4884, this strategy produces AuPt/Fe3O4/RGO nanocomposites whose catalyst–oxide–graphene triple-junction structure...