A5051993858- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Transition Metal Oxide Nanomaterials
- ZnO doping and properties
- Gas Sensing Nanomaterials and Sensors
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Electrocatalysts for Energy Conversion
- Semiconductor materials and devices
- Conducting polymers and applications
- Advanced battery technologies research
- GaN-based semiconductor devices and materials
- Semiconductor materials and interfaces
- Ga2O3 and related materials
- Supercapacitor Materials and Fabrication
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Electronic and Structural Properties of Oxides
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Advancements in Battery Materials
- Advanced Memory and Neural Computing
- Advanced Nanomaterials in Catalysis
- Thin-Film Transistor Technologies
- Silicon and Solar Cell Technologies
Yeungnam University
2016-2025
Government of the Republic of Korea
2020
National Renewable Energy Laboratory
2007-2012
Samsung (South Korea)
2006-2009
Keimyung University
2009
Gwangju Institute of Science and Technology
2000-2005
University of Pennsylvania
2005
Seoul National University
2004
Abstract The limited lifespan of aqueous zinc‐ion batteries (with vanadium‐oxide based cathodes) is constrained by practical applications due to corrosion accelerated vanadium ions leaching from the cathode and uneven dendrite growth on zinc metal anode. To address these issues, difference in size between hydrated (4.30 Å) electrolyte (8.34 considered. Uniformly coating MOF‐801 nanoparticles a pore 6.0 foil formed selective ion transport layer. uniform flux generated layer allows be...
We report on the crystallinity and photoelectrochemical (PEC) response of ZnO thin films codoped by Ga N. The ZnO:(Ga,N) were deposited cosputtering at room temperature followed postannealing 500°C in air for 2h. found that exhibited significantly enhanced compared to doped solely with N same growth conditions. Furthermore, incorporation over high temperatures. As a result, achieved dramatically improved PEC response, any Our results suggest general way improve wide-band-gap oxides.
We report on the effects of treating TiO2 nanocrystalline films with different concentrations TiCl4 (5–500 mM) film morphology, charge-carrier dynamics, and performance dye-sensitized solar cells. Transport recombination in TiCl4-treated were studied by frequency-resolved modulated photocurrent/photovoltage spectroscopies. These studies showed that, at a low concentration (5 mM), electron diffusion coefficient annealed increased. At intermediate (15–50 surface area increased, resulting an...
A heterojunction photocathode of CuO and CuBi2O4 grown on an FTO substrate (FTO/CuO/CuBi2O4) was synthesized using hydrothermal method followed by spin coating annealing to overcome the bottlenecks encountered in photoelectrochemical (PEC) water splitting application. The synthesis methods, morphological, structural properties, composition each sample under condition are discussed detail. with 15 layers annealed at 450 °C exhibited best PEC performance. Moreover, its current density reached...
p -type ZnO thin films with significantly reduced band gaps were synthesized by heavy Cu incorporation at room temperature and followed postdeposition annealing 500°C in air for 2h. All the rf magnetron sputtering on F-doped tin oxide-coated glass. The p-type conductivity was confirmed Mott-Schottky plots illuminated I-V analysis. Cu+1 acceptor states (at substitutional sites) their band-gap reduction demonstrated UV-visible absorption x-ray excited valence measurements.
Abstract Nickel nitride electrodes were prepared by reactive sputtering of nickel under a N 2 atmosphere at room temperature for application in mesoscopic dye- or quantum dot- sensitized solar cells. This facile and reliable method led to the formation Ni film with cauliflower-like nanostructure tetrahedral crystal lattice. The exhibited an excellent chemical stability toward both iodide polysulfide redox electrolytes. Compared conventional Pt electrodes, showed inferior electrocatalytic...
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,...
Electron diffusion coefficient (D) and electron lifetime (τ) of mesoporous TiO2 films with Nb2O5 energy barrier were investigated by the stepped light-induced transient measurements photocurrent photovoltage, compared that without Nb2O5. Both D τ values significantly increased barrier, resulting in remarkable enhancements length optimum thickness film. As a result, could provide much more efficient dye-sensitized solar cells additional effect improved as well existing at same film thickness.
We report on synthesis of a uniform and large area new form ZnO nanocorals. These nanostructures can provide suitable electrical pathways for efficient carrier collection as well surface areas the photoelectrochemical (PEC) cells. PEC devices made from these nanocoral structures demonstrate significantly enhanced photoresponse compared to compact nanorod films. Our results suggest that could be an excellent choice nanomaterial-based applications such dye-sensitized solar cells,...
PtRu alloy and PtRu−WO3 nanocomposite thin-film electrodes for methanol electrooxidation were fabricated by means of a sputtering method. The structural electrochemical properties well-defined characterized using X-ray diffraction (XRD), Rutherford backscattering spectroscopy (RBS), photoelectron (XPS), transmission electron microscopy, measurements. classified as follows: Pt-based (10−40 atom % Ru) Ru-based (60 structure. Among the formed method, PtRu-80, with 62 Pt confirmed XRD, showed...
The photoelectrochemical responses of WO3 thin films have been investigated as a function annealing temperature up to 600 °C. were deposited on unheated substrates by thermal evaporation followed at temperatures 300, 500, and °C for 5 h in air. film annealed 500 shows the best response due improved crystallinity enhanced light absorption long-wavelength region. Although exhibits better increased properties, it decreased comparison one These results strongly suggests that reduced amount...
The photoelectrochemical properties of nitrogen-incorporated films prepared by reactive radio frequency (rf) magnetron sputtering were measured and compared with those pure films. We find that nitrogen incorporation narrows the bandgap shifts optical absorption into visible light regions. further provide considerable photoresponse in long-wavelength regions up to above . As a result, exhibit higher photocurrents than under illumination. obtained photocatalytic activity indicates are...