A5073857137- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- Advanced Battery Technologies Research
- Extraction and Separation Processes
- Graphene research and applications
- MXene and MAX Phase Materials
- Transition Metal Oxide Nanomaterials
- Fuel Cells and Related Materials
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Semiconductor materials and interfaces
- Carbon and Quantum Dots Applications
- Electrochemical sensors and biosensors
- Magnetic Properties and Synthesis of Ferrites
- Electrochemical Analysis and Applications
- Electrospun Nanofibers in Biomedical Applications
- Layered Double Hydroxides Synthesis and Applications
- Semiconductor materials and devices
- Advanced Nanomaterials in Catalysis
- Carbon Nanotubes in Composites
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
Chungbuk National University
2021-2025
Korea University
2014-2021
Government of the Republic of Korea
2017-2020
Seoul Institute
2018-2020
Highly porous MoSe2-reduced graphene oxide-carbon nanotube (MoSe2-rGO-CNT) powders were prepared by a spray pyrolysis process. The synergistic effect of CNTs and rGO resulted in containing ultrafine MoSe2 nanocrystals with minimal degree stacking. initial discharge capacities MoSe2-rGO-CNT, MoSe2-CNT, MoSe2-rGO, bare for sodium ion storage 501.6, 459.7, 460.2, 364.0 mA h g-1, respectively, at 1.0 A g-1. MoSe2-rGO-CNT composite had superior cycling rate performances compared the MoSe2-rGO...
Abstract A simple one‐pot synthesis of metal selenide/reduced graphene oxide (rGO) composite powders for application as anode materials in sodium‐ion batteries was developed. The detailed mechanism formation the CoSe x –rGO that were selected first target material spray pyrolysis process studied. crumple‐structured prepared by at 800 °C had a crystal structure consisting mainly Co 0.85 Se with minor phase 2 . bare comparison spherical shape and hollow structure. discharge capacities 50th...
Uniquely structured CoSe2 -carbon nanotube (CNT) composite microspheres with optimized morphology for the hydrogen-evolution reaction (HER) are prepared by spray pyrolysis and subsequent selenization. The ultrafine nanocrystals uniformly decorate entire macroporous CNT backbone in -CNT microspheres. strongly improves electrocatalytic activity of improving electrical conductivity minimizing growth during synthesis process. In addition, structure resulting from increasing removal rate...
A new mechanism for the transformation of nanostructured metal selenides into uniquely structured oxides via Kirkendall effect, which results from different diffusion rates and Se ions O 2 gas, is proposed. SnSe nanoplates are selected as first target material transformed SnO hollow by effect. SnSe‐C composite powder, in attached or stuck to amorphous carbon microspheres, transforms several tens a thermal oxidation process under an air atmosphere. Core–shell‐structured SnSe‐SnSe @SnO ,...
Abstract As rechargeable battery technology continues to advance, the development of advanced electrode materials is becoming increasingly crucial meet emerging demand for electrochemical energy storage devices with higher and power densities. However, progress in anode has been sluggish graphite still widely applied commercial batteries. Alloying conversion reaction‐based materials, including Si, Sn, metal oxides, chalcogenides, have investigated as they exhibit much theoretical capacities...
Recently, nanostructured carbon materials, such as hollow-, yolk-, and core-shell-configuration, have attracted attention in various fields owing to their unique physical chemical properties. Among them, yolk-shell structured is considered a noteworthy material for energy storage due its fast electron transfer, structural robustness, plentiful active reaction sites. However, the difficulty of synthesis controllable has been raised limitation. In this study, novel strategy microspheres that...
Abstract Uniquely structured FeSe x -reduced graphene oxide (rGO) composite powders, in which hollow nanoparticles are uniformly distributed throughout the rGO matrix, were prepared by spray pyrolysis applying nanoscale Kirkendall diffusion process. Iron oxide-rGO powders transformed into -rGO a two-step post-treatment Metallic Fe nanocrystals formed during first-step process selenization The had mixed crystal structures of and 2 phases. A content 33% was estimated from TG analysis powders....
SnSe nanoplates with thin and uniform morphology are prepared by one-pot spray pyrolysis, examined as anode materials for Na-ion batteries. During the pyrolysis process, metallic Se Sn from SeO2 SnO2, respectively, under a reducing atmosphere. Metallic metalloid Se, melting points of 232 221 °C, form melted Sn–Se mixture, which reacts exothermally to nanocrystals. Several these nanocrystals grown simultaneously forming micron-sized powder. Complete elimination excess amount H2Se gas, results...
Abstract Highly efficient anode materials with novel compositions for Li‐ion batteries are actively being researched. Multicomponent metal selenite is a promising candidate, capable of improving their electrochemical performance through the formation oxide and selenide heterostructure nanocrystals during first cycle. Here, binary nickel–cobalt derived from Ni–Co Prussian blue analogs (PBA) chosen as target material: PBA selenized partially oxidized in sequence, yielding (NiCo)SeO 3 phase...
Unique structured microspheres with multishells comprising graphitic carbon-coated Fe<sub>3</sub>O<sub>4</sub> hollow nanopowders are successfully synthesized as an efficient anode material for lithium-ion batteries
Potassium-ion batteries (KIBs) are considered as promising alternatives to lithium-ion owing the abundance and affordability of potassium. However, development suitable electrode materials that can stably store large-sized K ions remains a challenge. This study proposes facile impregnation method for synthesizing ultrafine cobalt-iron bimetallic selenides embedded in hollow mesoporous carbon nanospheres (HMCSs) superior anodes KIBs. involves loading metal precursors into HMCS templates using...
Abstract Multicomponent materials with various double cations have been studied as anode of lithium‐ion batteries (LIBs). Heterostructures formed by coupling different‐bandgap nanocrystals enhance the surface reaction kinetics and facilitate charge transport because internal electric field at heterointerface. Accordingly, metal selenites can be considered efficient LIBs they transform into selenide oxide in first cycle. However, few studies reported synthesis uniquely structured selenite...
Abstract Highly porous carbon materials with a rationally designed pore structure can be utilized as reservoirs for metal or nonmetal components. The use of small‐sized compound nanoparticles, completely encapsulated by materials, has attracted significant attention an effective approach to enhancing sodium ion storage properties. These have the ability mitigate structural collapse caused volume expansion during charging process, enable short transport length, and prevent polysulfide...
Herein, synthesis of nanostructured carbon yolk–shell, which have various thicknesses the outer shell, are introduced. The optimized nickel–cobalt selenide–carbon yolk–shell exhibited excellent performance as a sodium-ion battery anode material.
We report the kilogram-scale, simple, and cost-effective synthesis of Pd-loaded quintuple-shelled Co3O4 microreactors by spray drying aqueous droplets containing cobalt nitrate, palladium citric acid, ethylene glycol subsequent heat treatment. Highly viscous gel spheres Co Pd salts were successfully converted into multi thin-shelled reactors uniformly loaded with catalysts sequential combustion carbon decomposition metal from outer to inner regions during one-step The responses (resistance...
Multicomponent metal oxide hollow-nanosphere decorated reduced graphene (rGO) composite powders are prepared by spray pyrolysis with nanoscale Kirkendall diffusion. The double-layer NiFe2O4@NiO-hollow-nanosphere rGO using the first target material. NiFe-alloy-nanopowder as an intermediate product post-treatment under reducing atmosphere of NiFe2O4/NiO-decorated obtained pyrolysis. different diffusion rates Ni (83 pm for Ni2+) and Fe (76 Fe2+, 65 Fe3+) cations radii during result in...