A5088776131- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Gas Sensing Nanomaterials and Sensors
- Electrocatalysts for Energy Conversion
- ZnO doping and properties
- Catalytic Processes in Materials Science
- CO2 Reduction Techniques and Catalysts
- Electrochemical Analysis and Applications
- Advancements in Battery Materials
- Advanced battery technologies research
- Transition Metal Oxide Nanomaterials
- Nanomaterials for catalytic reactions
- Electronic and Structural Properties of Oxides
- Supercapacitor Materials and Fabrication
- Ammonia Synthesis and Nitrogen Reduction
- TiO2 Photocatalysis and Solar Cells
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Iron oxide chemistry and applications
- Thermal properties of materials
- Mesoporous Materials and Catalysis
- Analytical Chemistry and Sensors
- Advanced Battery Materials and Technologies
- Catalysis and Hydrodesulfurization Studies
- Fuel Cells and Related Materials
Pusan National University
2019-2025
Government of the Republic of Korea
2017-2019
Jeonnam Bioindustry Foundation
2016-2018
Mokpo National University
2014-2018
The University of Texas at Austin
2013
Korea Advanced Institute of Science and Technology
2008-2012
Sogang University
2008
Mie University
1995
Pure rocksalt (c-CoO) and wurtzite (h-CoO) phases of cobaltous oxide (CoO) have been selectively prepared through thermodynamically kinetically controlled reactions a single molecular precursor Co(acac)3 (acac: acetylacetonate), respectively. Changing thermal decomposition conditions the produces different distinct morphologies oxides. Hexagonal pyramidal shaped h-CoO nanocrystals formed by flash heating reaction mixture (185 °C for 2 h, kinetic control condition), whereas cube c-CoO...
Abstract Developing catalytic systems with high efficiency and selectivity is a fundamental issue for photochemical carbon dioxide conversion. In particular, rigorous control of the structure morphology photocatalysts decisive performance. Here, we report synthesis zinc oxide-copper(I) oxide hybrid nanoparticles as colloidal forms bearing copper(I) nanocubes bound to spherical cores. The behave direct conversion methane in an aqueous medium, under ambient pressure temperature. catalysts...
Hollow nan': face-centered cubic (fcc) Co nanoparallelepipeds were prepared by thermolysis of solid fcc CoO in oleylamine (see TEM image). The are reduced the surfactant to form hollow nanoparallelepipeds. Voids and generated on surface removal oxide as carbon monoxide. Detailed facts importance specialist readers published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please note: publisher is responsible for...
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...
Colloidal, monodisperse, highly crystalline ITO nanoparticles with various particle sizes and tin contents were prepared by a one-pot thermal decomposition of indium precursors in oleylamine. The PL emission maxima become blue-shifted as the size decreases content increases.
Controlling the bulk and surface structure of metal oxide nanostructures is crucial to obtain superior electronic electrochemical properties. However, synthetic or post-treatment techniques for preparing such structures, especially those with complex configurations, still remains a challenge. Herein, we report completely novel approach-an amorphous carbon coating on coupled controlled oxidation state in bulk-via simple glucose treatment. The structures iron oxides are by carbothermal...
We report that oxide composite electrodeposition can be used for the facile preparation of metal-doped BiVO4 photoelectrodes photoelectrochemical water oxidation. The photoactivity film was improved by addition a small amount tungstic acid particles during electrodeposition. These are incorporated in deposit and finally generate tungsten-doped bismuth vanadate. suspended plating solution were electrostatically attracted to cathode accordingly into (electrostatic deposition). WO3...
We describe a composite of the n-type semiconductors for photoelectrochemical oxygen evolution reaction (OER). A simple drop-casting technique mixed precursors and one-step annealing process were used in synthesis WO3/CuWO4 composite. The showed improved photocurrent water oxidation compared to either two compounds individually. discuss possible electron-hole separation mechanisms comprising primary photon-absorbing semiconductor CuWO4 with secondary WO3. When is simultaneously irradiated,...
Electrochemical and chemical phase transformations of α-Co(OH) 2 into various other cobalt hydroxides were performed, their structures characterized to discern the correlation between electrocatalytic activity crystal structure.
The evolution of the phase and morphology FeOOH nanorods prepared by a hydrothermal method is studied via X-ray diffraction (XRD) in situ transmission electron microscopy. nanorod with tetragonal structure (β-FeOOH) gradually converted into rhombohedral Fe2O3 simple thermal treatment. existence an intermediate high lattice strains during transition identified Rietveld analysis using XRD. electrochemical properties are investigated based on crystal phases to elucidate their relative catalytic...
A Ni single-atom catalyst with Ni–N4–xCx active sites is prepared in a single pyrolysis step which the atom incorporated carbon framework through nitrogen and coordination utilizing ionothermal synthesis method. In comparison to complicated procedures of catalysts, this method provides general facile obtain catalysts an opportunity synthesize at large scale. The precursors used such as adenine, fructose, glucose are derived from biomass essential requirement for green process. synthetic...
A BiVO4/Bi2S3 composite comprising Bi2S3 nanowires on top of a BiVO4 film was prepared via hydrothermal reaction. Because additional Bi3+ ions were not delivered during the reaction, served as ion source for development Bi2S3. detailed growth mechanism nanowire elucidated by an analysis concentration gradient and S2– The in situ followed etching to VO43– regrowth Bi2S3, which resulted rapid evolution substrate. fabricated BiVO4/Bi2S3NW exhibited improved photoelectrochemical activity...
This review describes the heteroatom-doped core–shell nanostructures (HCSNs) for oxygen reduction reaction (ORR). We also cover di-, tri-, and multi-doped HCSNs ORR reactive descriptors used enhancing activity.
Various electrocatalysts are extensively examined for their ability to selectively produce desired products by electrochemical CO
Abstract Direct seawater splitting is a promising pathway for sustainable hydrogen (H 2 ) production. However, significant challenges persist, particularly at the anode, where high concentration of chloride ions induces competitive reactions between chlorine evolution reaction (CER) and oxygen (OER). Although gas (Cl has higher commercial value than (O ), selective generation often more advantageous large‐scale Compared with freshwater splitting, introduces additional complexities, including...
Abstract The state-of-the-art anion-exchange membrane water electrolyzers (AEMWEs) require highly stable electrodes for prolonged operation. stability of the electrode is closely linked to effective evacuation H 2 or O gas generated from surface during electrolysis. In this study, we prepared a super-hydrophilic by depositing porous nickel–iron nanoparticles on annealed TiO nanotubes (NiFe/ATNT) rapid outgassing such nonpolar gases. NiFe/ATNT exhibited an overpotential 235 mV at 10 mA cm −2...
Photoelectrochemical (PEC) cells based on silicon photocathodes offer promising pathways for solar‐driven hydrogen production, yet face fundamental limitations arising from competing requirements between catalytic activity and optical absorption. Herein, a paradigm‐shifting approach is presented through spatial segregation of functional regions in photocathodes, effectively decoupling these while maintaining efficient charge transport. This design comprises precisely engineered catalyst...
Phosphidated-Li4Ti5O12 shows high capacity with a significantly enhanced kinetics opening new possibilities for ultra-fast charge/discharge of lithium rechargeable batteries. The in vitro cytotoxicity test proves its fabulous cell viability, indicating that the toxicity problem nanoparticles can be also solved by phosphidation.
Most transition metal oxides have a cubic rocksalt crystal structure, but ZnO and CoO are the only stable known to possess hexagonal structure. Unprecedented wurtzite MnO has been prepared by thermal decomposition of Mn(acac)(2) on carbon template. Structural characterization carried out TEM, SAED, Rietveld analysis using XRD. The experimental theoretical magnetic results indicate ordering MnO. Density functional calculations performed in order understand electronic piezoelectric properties...
A single-crystalline Bi2S3 nanowire array (Bi2S3NWA) is synthesized by an in situ hydrothermal reaction on the surface of a Bi2MoO6 film. As no additional source Bi3+ provided during process, layer acts as for synthesis nanowires. The fabricated Bi2MoO6/Bi2S3NWA electrode exhibited increased photoelectrochemical (PEC) sulfite oxidation activity, which attributed mainly to effective interface obtained growth, compared other electrodes. generated electron from conduction band rapidly transfers...
Noble-metal-decorated metal oxide sensors have shown promising gas-sensing properties. However, the optimal dispersion of particles on a semiconductor is still challenging for most sensing materials. In this study, Co3O4 nanocubes (NCs) and Pt-supported NCs were prepared as materials acetone gas detection. Transmission electron microscopy X-ray diffraction used to examine structure exposed facets NCs. As result, identified single-crystalline phase spinel Co3O4, each surface {100} plane. To...