A5066765415- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Fuel Cells and Related Materials
- Advanced Battery Materials and Technologies
- Membrane-based Ion Separation Techniques
- Advancements in Battery Materials
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Thermoelectric Materials and Devices
- Membrane Separation Technologies
- Supercapacitor Materials and Fabrication
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- Electrocatalysts for Energy Conversion
- Advanced Photocatalysis Techniques
- Hydrogen Storage and Materials
- Nuclear materials and radiation effects
- Thermal Expansion and Ionic Conductivity
- Graphene research and applications
- Chemical Synthesis and Characterization
- Inorganic Chemistry and Materials
- Zeolite Catalysis and Synthesis
- Thermal properties of materials
- Perovskite Materials and Applications
- Crystallization and Solubility Studies
Ajou University
2007-2025
Mokpo National University
2019-2023
Government of the Republic of Korea
2016-2020
Korea Institute of Energy Research
2013-2019
Daejeon University
2014-2017
University of Twente
2010-2014
Institute of Nanotechnology
2014
Samsung (South Korea)
2005
Abstract Covalent organic frameworks (COFs) have emerged as a promising light-harvesting module for artificial photosynthesis and photovoltaics. For efficient generation of free charge carriers, the donor–acceptor (D-A) conjugation has been adopted two-dimensional (2D) COFs recently. In 2D D-A COFs, photoexcitation would generate polaron pair, which is precursor to carriers lower binding energy than an exciton. Although character primary excitation species key factor in determining...
Selection of an appropriate electrolyte medium is essential for successful NH3 electro-synthesis at low temperature and pressure. In this study, 2-propanol was employed as its effectiveness in the electro-reduction N2 to under ambient conditions evaluated. synthesis faradaic efficiency using a mixture 2-propanol/water (9:1, v/v) surpassed those when electrosynthesis carried out solely water. The concentration H2SO4 applied current density influenced 2-propanol-based system, optimal led...
In this study, a novel electrolysis cell based on ethylenediamine (EDA) as cathodic solvent was developed for NH3 electro-synthesis. The NH3-generating cathode chamber filled with 0.1 M LiCl/EDA and separated by cation exchange membrane from the anodic compartment, which 0.05 H2SO4 aqueous solution. It appeared that EDA cathodically stable, thus electron-stealing medium destruction substantially avoided. faradaic efficiency synthesis 17.2%, producing 7.73 × 10−7 mol 1 h at voltage of 1.8 V...
Graphite is used as a state-of-the-art anode in commercial lithium-ion batteries (LIBs) due to its highly reversible storage capability and low electrode potential. However, graphite anodes exhibit sluggish diffusion kinetics for intercalation/deintercalation, thus limiting the rate of LIBs. In order determine coefficient anodes, we employed galvanostatic intermittent titration technique (GITT) quantify quasi-equilibrium open circuit potential function concentration electrode. Three plateaus...
Abstract Lithium‐mediated reduction of dinitrogen is a promising method to evade electron‐stealing hydrogen evolution, critical challenge which limits faradaic efficiency (FE) and thus hinders the success traditional protic‐solvent‐based ammonia electro‐synthesis. A viable implementation lithium‐mediated pathway using lithium‐ion conducting glass ceramics involves i) lithium deposition, ii) nitridation, iii) formation. Ammonia was successfully synthesized from molecular nitrogen water,...
Nanostructured silicon (Si) is useful in many applications and has typically been synthesized by bottom-up colloid-based solution processes or top-down gas phase reactions at high temperatures. These methods, however, suffer from toxic precursors, low yields, impractical processing conditions (i.e., pressure). The magnesiothermic reduction of oxide (SiO2) also introduced as an alternative method. Here, we demonstrate the SiO2 a simple milling process using lab-scale planetary-ball mill...
Microsupercapacitors are microscale rechargeable energy storage devices that can support or replace batteries in ultrasmall electronic devices. Although the use of high-capacitive, two-dimensional materials is promising, other methods needed to reach a high capacitance and density, which cannot be achieved by fully utilizing surface electrode materials. Here, we introduce an effective strategy control geometry interdigital microelectrodes for achieving ultrahigh edge effect in-plane...
Electrical conductivity relaxation is used for monitoring the cubic-to-hexagonal phase transition in perovskite-type oxide Ba0.5Sr0.5Co0.8Fe0.2O3−δ. After situ annealing at 1173 K, which temperature cubic polymorph stable, electrical experiments are conducted during long-term 1073 K. The decreases surface exchange and chemical diffusion coefficients with time due to sluggish found be correlated. It demonstrated that B-site doping Zr an amount as low 3 mol % stabilizes high-temperature...
We report a high-performance redox flow capacitor by using redox-active hydroquinone-based pseudocapacitive slurry electrodes.
Dual-phase ceramic membranes with very high oxygen flux have been designed by taking into account the volume fraction of fluorite phase, membrane thickness, and surface modification. The Ce0.9Gd0.1O2−δ–La0.6Sr0.4Co0.2Fe0.8O3−δ (GDC–LSCF) dual-phase has systematically investigated as a function thickness phase or without percolation threshold composites for electronic conduction determined to be about 20 vol % LSCF general effective-medium theory. uncoated phase-rich (80 GDC–20 LSCF) 30-μm...
Most reported thermoelectric modules suffer from considerable power loss due to high electrical and thermal resistivity arising at the interface between legs metallic contacts. Despite increasing complaints on this critical problem, it has been scarcely tackled. Here we report metallization layer of Fe–Ni alloy seamlessly securing skutterudite materials electrodes, allowing for a minimal energy transferred former. It is applied an 8-couple module that consists n-type (Mm,Sm)yCo4Sb12 (ZTmax =...
Flow-electrode capacitive deionization (FCDI) offers infinite ion adsorption for continuous desalination of high-concentration saline water by supplying a flow-electrode to the cell. Although extensive efforts have been made maximize rate and efficiency FCDI cells, electrochemical properties these cells are not fully understood. This study investigated factors affecting containing activated carbon (AC; 1–20 wt %) various flow rates (6–24 mL/min) using impedance spectroscopy before after...
Abstract Organic–inorganic copper(I) halide complexes have attracted attention due to their optoelectronic properties and non‐toxic nature. In this study, we systematically synthesized melamine as single crystals, (CuBr(melamine) CuI(melamine)) polycrystalline powders, CuBr x I 1‐ (melamine) (0 ≤ 1). The crystal structures of CuBr(melamine) CuI(melamine) are isotypic with a triclinic space group P , where is connected three adjacent halides along the ‐axis ligand c ‐axis, forming an infinite...
Abstract Manganese batteries garnered significant attention as sustainable and cost‐effective alternatives to lithium‐ion batteries. For the first time, manganese are demonstrated using a hexacyanoferrate cathode organic electrolyte solution, specifically saturated Mn(ClO₄)₂ in acetonitrile. The exhibits an average operating voltage of 1.7 V discharge capacity 73.4 mAh g −1 at 0.1 A , retaining 71.1% after 1500 cycles 0.2 . Diffusion pathways barriers reveal efficient 3D Mn 2 ⁺ ion diffusion...
The oxygen surface exchange kinetics of mixed conducting perovskite oxides SrTi1−xFexO3−δ (x = 0, 0.01, 0.05, 0.35, 0.5) has been investigated as a function temperature and partial pressure using the pulse-response 18O–16O isotope (PIE) technique. Arrhenius activation energies range from 140 kJ mol−1 for x 0 to 86 0.5. Extrapolating dependence intermediate range, 500–600 °C, indicates that rate exchange, in air, increases with increasing iron mole fraction, but saturates at highest fraction...