A5077569769- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- TiO2 Photocatalysis and Solar Cells
- Perovskite Materials and Applications
- Glass properties and applications
- ZnO doping and properties
- Luminescence Properties of Advanced Materials
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Iron oxide chemistry and applications
- Advanced Battery Materials and Technologies
- Electronic and Structural Properties of Oxides
- Nuclear materials and radiation effects
- Advancements in Battery Materials
- Catalytic Processes in Materials Science
- Layered Double Hydroxides Synthesis and Applications
- Polymer Surface Interaction Studies
- Advanced Polymer Synthesis and Characterization
- Polyoxometalates: Synthesis and Applications
- Supercapacitor Materials and Fabrication
- Photorefractive and Nonlinear Optics
- Conducting polymers and applications
- Catalysis and Oxidation Reactions
- Multiferroics and related materials
- Chalcogenide Semiconductor Thin Films
Korea Basic Science Institute
2015-2024
Pusan National University
2012-2021
Korea Advanced Institute of Science and Technology
2018
Hanlim Pharm (South Korea)
2017
Government of the Republic of Korea
2016
Vellore Institute of Technology University
2015
LG (South Korea)
2011
Pohang University of Science and Technology
2000-2009
Pukyong National University
2007
General Motors (United States)
2004
A novel photocatalyst, PbBi2Nb2O9 has been discovered that shows high activities for degradation of organic pollutants, generation photocurrent, and water decomposition into O2 or H2, all under visible right irradiation (lambda >/= 420 nm). This is the first example an undoped, single-phase oxide photocatalyst such reactivity. Its quantum yields are much higher than those most previously reported materials, especially in to generate oxygen (29%). Since it oxide, there less concern stability...
In the search for efficient photocatalysts working under visible light, we have investigated effect of cation substitution on a layered perovskite, La2Ti2O7. Among various metal dopants, only Cr and Fe induced intense absorption light (λ > 400 nm), these catalysts produced H2 photocatalytically from water in presence methanol irradiation 420 nm). The polymerized complex method was found to be more fabrication present producing homogeneous structure than solid-state reaction. characterization...
A bulk heterojunction photocatalyst of interfacing CaFe(2)O(4) and MgFe(2)O(4) nanoparticles is highly active for oxidative degradation isopropyl alcohol hydrogen production from water under visible light, because the exciton easily reaches interface dissociates to minimize recombination.
CdS/TiO2 composite photocatalysts were platinized by different methods such as photodeposition (PD), wet impregnation (WI), and chemical reduction (CR), studied for hydrogen production from water under visible light. All Pt species in the metallic state, yet PD WI contained electron-deficient Pt. In particular, Pt−Ti formation was identified catalyst, which contributed to electron deficiency of These two exhibited higher rates evolution due favorable diffusion photoelectrons excited CdS...
With the demands for better performance of polymer electrolyte membrane fuel cells, studies on controlling distribution ionomers have recently gained interest. Here, we present a tunable ionomer in catalyst layer (CL) with dipropylene glycol (DPG) and water mixtures as dispersion medium. Dynamic light scattering molecular dynamics simulation demonstrate that, by increasing DPG content dispersion, size aggregates is exponentially reduced because higher affinity Nafion ionomers. The resulting...
High-temperature annealing above 700 °C improves the activity of photoelectrochemical water oxidation by hematite photoanodes increasing its crystallinity. Yet, it brings severe agglomeration nanostructured thin films and deteriorates electrical conductivity transparent conducting oxide (TCO) substrate. We report here that nanostructure TCO could be preserved, while high crystallinity is attained, hybrid microwave (HMA) utilizing a graphite susceptor for efficient absorption. Thus, thin-film...
Nitrogen-doped perovskite type materials, Sr2Nb2O7−xNx (0, 1.5 < x 2.8), have been studied as visible light-active photocatalysts for hydrogen production from methanol–water mixtures. Nitrogen doping in Sr2Nb2O7 red-shifted the light absorption edge into range and induced photocatalytic activity. There existed an optimum amount of nitrogen that showed maximum rate production. Among potential variables might cause this activity variation, crystal structure appeared to be most important. Thus,...
The Pb substitution effect was investigated experimentally and theoretically on the crystal structure of BaSnO3 photo-oxidation activity H2O. chemically doped in induced a concentration-dependent redshift experimental band gap (BG). BaPb0.8Sn0.2O3 system produced 32μmol∕h O2 under λ⩾420nm photons, but no for BaSnO3. DFT calculations BaPbxSn1−xO3 (x=0,0.5,1) by using generalized approximation, implying BG alteration photocatalytic BaPbxSn1−xO3, are due to 6s orbital Thus modified insulating...
Numerous modifications strategies are applied to spinel ZnFe<sub>2</sub>O<sub>4</sub> nanorods with a band gap energy of ∼2.0 eV enhance their activity as photoanode for photoelectrochemical (PEC) water splitting.
The study focuses on hydrothermal synthesis of MoS<sub>2</sub>–MoO<sub>3</sub> nanostructures and their application in the modification CdS photoanodes.
The WO3∕W∕PbBi2Nb1.9Ti0.1O9 photocatalyst was fabricated by depositing the tungsten clusters over p-type perovskite base material with chemical vapor deposition method, and later partly oxidizing surfaces of these to obtain n-type WO3 overlayers W metal layer as an Ohmic junction. This NCPC showed unprecedented high activity for photocatalytic oxidation water, photocurrent generation, acetaldehyde decomposition under visible light irradiation (λ⩾420nm).