A5074976953- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Electrocatalysts for Energy Conversion
- Copper-based nanomaterials and applications
- Quantum Dots Synthesis And Properties
- Transition Metal Oxide Nanomaterials
- Advanced battery technologies research
- Gas Sensing Nanomaterials and Sensors
- Supercapacitor Materials and Fabrication
- ZnO doping and properties
- Advancements in Battery Materials
- Ga2O3 and related materials
- Conducting polymers and applications
- Fuel Cells and Related Materials
- CO2 Reduction Techniques and Catalysts
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Electrochemical Analysis and Applications
- Semiconductor materials and devices
- Advanced Nanomaterials in Catalysis
- Photonic Crystals and Applications
- Advanced Thermoelectric Materials and Devices
- Ammonia Synthesis and Nitrogen Reduction
- Perovskite Materials and Applications
- Iron oxide chemistry and applications
Chonnam National University
2016-2025
Gwangju National University of Education
2016-2025
Chonnam National University Hospital
2012-2024
Gwangju University
2020-2021
Government of the Republic of Korea
2020
Convergence
2018
National Renewable Energy Laboratory
2009-2013
The University of Texas at Austin
2013
Seoul National University
2006-2010
Seoul National University of Science and Technology
2006-2010
We report on the characteristics of a ZnO light-emitting diode (LED) comprised heterostructure p-ZnO/n-GaN. The LED structure consisted phosphorus doped p-ZnO film with hole concentration 6.68×1017cm−3 and Si-doped n-GaN an electron 1.1×1018cm−3. I–V showed threshold voltage 5.4 V electroluminescence (EL) emission 409 nm at room temperature. EL peak was attributed to band gap which reduced as result offset interface n-GaN.
Straight-stranded anatase TiO2 nanotubes were produced by anodic oxidation on a pure titanium substrate in an aqueous solution containing 0.45 wt % NaF electrolyte (pH 4.3 fixed). The average length of the was approximately 3 μm, which had effect level dye adsorption dye-sensitized solar cells. applied as working electrode solid-state cell. An 1 nm ZnO shell coated nanotube to improve open-circuit voltage (Voc) and conversion efficiency cell, retard any back reaction. Although Voc...
A general template-assisted electrochemical approach was used to synthesize three-dimensional ordered Ni core-NiO shell inverse opals (IOs) as electrodes for supercapacitors. The Ni-NiO IO displayed pseudo-capacitor behavior, good rate capability and cycling performance.
A rapid screening technique utilizing a modified scanning electrochemical microscope has been used to screen photocatalysts and determine how metal doping affects its photoelectrochemical (PEC) properties. We now extend this the examination of photocatalyst (semiconductor/semiconductor) composites: by examining variety ZnWO4/WO3 composites, 9% Zn/W ratio produced an increased photocurrent over pristine WO3 with both UV visible irradiation on spot array electrode. With bulk films various...
Herein, we report the preparation and characterizations of sulfur (S)-doped TiO2 nanotube (TONT) arrays prepared by a sulfurization process TONT via electrochemical anodization on Ti substrate with pure arrays. The S-doped were annealing temperature from 450 to 550 °C under H2S gas for 10 min, these reaction conditions corresponded no modification morphological features relative that Furthermore, 500 annealed showed enhanced visible light absorption high electric conductivity, thus resulting...
Inverse opal (IO) films of tin dioxide (SnO2) were fabricated on polystyrene (PS) beads (diameter = 350 nm (±20 nm) with a spin coating method. To compensate for the large band gap (Eg 3.8 eV), thin TiO2 shell was deposited SnO2–IO atomic layer deposition (ALD), which produced shells thicknesses 10–40 nm. The morphological changes and crystalline properties SnO2 TiO2-coated (herein after referred to as TiO2/SnO2) IO investigated field-emission scanning electron microscopy X-ray diffraction,...
Hollow nanostructured materials have attracted considerable interest as lithium ion battery electrodes because of their good electrochemical properties. In this study, we developed a general procedure for the synthesis hollow metal silicates via hydrothermal process using silica nanoparticles templates. The morphology and composition could be controlled by changing precursor. as-prepared hierarchical nanostructures with diameters ∼100–200 nm were composed variously shaped primary particles...
Herein, bimetallic iron (Fe)-manganese (Mn) oxyhydroxide ((Fe1-x, Mnx )OOH, FeMnOOH) nanosheets on fluorine-doped tin oxide conducting substrates and semiconductor photoanodes are synthesized by a facile, room temperature, electroless deposition method as catalysts for both electrochemical photo-electrochemical (PEC) water splitting, respectively. Surprisingly, Mn-doped FeOOH can significantly modulate the nanosheet morphology to increase active surface area, boost more sites, augment...
Hydrogen is one of the most widely used essential chemicals worldwide, and it also employed in production many other chemicals, especially carbon-free energy fuels produced via photoelectrochemical (PEC) water splitting. At present, gallium arsenide represents efficient photoanode material for PEC oxidation, but known to either be anodically photocorroded or photopassivated by native metal oxides competitive reaction, limiting efficiency stability. Here, we report chemically etched GaAs that...