A5055483753- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Glass properties and applications
- Cultural Heritage Materials Analysis
- Ionic liquids properties and applications
- Transition Metal Oxide Nanomaterials
- Pigment Synthesis and Properties
- Gas Sensing Nanomaterials and Sensors
- Ga2O3 and related materials
- Metal-Catalyzed Oxygenation Mechanisms
- Advanced Battery Materials and Technologies
- Photosynthetic Processes and Mechanisms
- Magnetic Properties and Applications
- Advanced X-ray Imaging Techniques
- ZnO doping and properties
- Magnetic properties of thin films
- Material Dynamics and Properties
- Fuel Cells and Related Materials
- Catalytic Processes in Materials Science
- X-ray Spectroscopy and Fluorescence Analysis
- Metallic Glasses and Amorphous Alloys
- Advancements in Battery Materials
- CO2 Reduction Techniques and Catalysts
- Enzyme Structure and Function
- Analytical Chemistry and Sensors
Pohang Accelerator Laboratory
2006-2017
Pohang University of Science and Technology
2006-2017
The development of a water oxidation catalyst has been demanding challenge in realizing splitting systems. asymmetric geometry and flexible ligation the biological Mn4CaO5 cluster are important properties for function photosystem II, these can be applied to design new inorganic catalysts. We identified crystal structure, Mn3(PO4)2·3H2O, that precipitates spontaneously aqueous solution at room temperature demonstrated its high catalytic performance under neutral conditions. bulky phosphate...
For the efficient electroconversion of CO2 to formate, CO and H2 evolution must be suppressed. Herein, carbon-supported BiOx nanoparticles (BiOx/C) were investigated as a potential candidate for reduction. In bicarbonate solutions, BiOx/C catalysts exhibited high Faradaic efficiency 93.4% formate from −1.37 −1.70 V versus Ag/AgCl with negligible amount H2. Stable partial current densities efficiencies also achieved in 0.5 M NaCl (12.5 mA cm–2 96.0%, respectively). The possible reaction...
Abstract The oxygen evolution reaction (OER) is considered a major bottleneck in the overall water electrolysis process. In this work, highly active manganese oxide nano-catalysts were synthesized via hot injection. Facile surface treatment generated Mn(III) species on monodisperse 10 nm MnO nanocrystals (NCs). Size dependency of NCs OER activity was also investigated. Surprisingly, partially oxidized only required 530 mV @ 5 mA cm −2 under near neutral conditions.
Orthorhombic Sb2S3 (stibnite) and its amorphous Sb2S3/C composite were synthesized by solid-state routes, such as heat treatment high energy mechanical milling (HEMM). X-ray diffraction, photoelectron spectroscopy resolution transmission electron microscopy confirmed that the was composed of phases distributed uniformly within an carbon matrix. The electrochemical reaction mechanism with Li examined extended absorption fine structure analyses. fabricated electrode showed excellent...
Abstract A large change is observed in the magnetic properties of amorphous Fe–Zr thin films sputtered at different Ar pressures. The depends on composition alloys and compositions near 60 at.% Fe, for example, magnetisation measured 10 kOe increases 30-fold with an increase pressure from 2 to mTorr. are well explained by a combination two phenomena—superparamagnetism spin glass behaviours—and partly related number density magnetically correlated region. Examinations microstructure X-ray...
HIZEN celadons produced at Arita and Imari areas in Japan from 1630's to 1790's (Edo period) have been investigated by means of X-ray fluorescence analysis, diffraction absorption spectra using synchrotron radiation. It is found that, the celadons, color brightness celadon glazes depends on structural property raw basic ceramics taken Imaizumi (Arita) Ohkwachi (Imari), where former mainly Quartz-SiO2, later Sanidine ((K,Na)Si3O8). confirmed that CaCO3 natural wood ash added artificially into...
A microprobe system has been installed on the nanoprobe/XAFS beamline (BL8C) at PLS-II, South Korea. Owing to reproducible switch of gap in-vacuum undulator (IVU), intense and brilliant hard X-ray beam an IVU can be used in fluorescence (XRF) absorption fine-structure (XAFS) experiments. For high-spatial-resolution experiments a Kirkpatrick-Baez mirror focus millimeter-sized micrometer-sized beam. The performance this was examined by combination micro-XRF imaging micro-XAFS beetle wing....
HIZEN celadon glazes produced in 1630's to 1790's (Edo period, Japan) have been investigated by means of X-ray absorption spectra (XAS) near a Fe-K edge using synchrotron radiation and Mössbauer spectrum. The XAS suggest that the local structure around Fe2O3 fine powders is slightly different between Izumiyama ceramics mainly Quartz-SiO2 Ohkawachi feldspar (K,Na)Si3O8 (Sanidine), celadons include glassy state, though diffraction patterns do not show any peaks structure. spectrum suggests...
The Ca 3 (VO 4 ) 2 single crystal was grown by the Czochralski method. pulled with 1 mm/hr and rotated 10 rpm for optimum growth condition. thermal annealing of as-grown performed at 500°C 24 hours. Laue conoscopic image techniques were used to determine crystallographic axes . results showed a negative uniaxial indicatrix. spectra Ca2p, V2p, O1s core-level data in crystals investigated X-ray photoelectron spectroscopy.