A5100330186- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advancements in Photolithography Techniques
- Supercapacitor Materials and Fabrication
- Electrocatalysts for Energy Conversion
- Semiconductor materials and devices
- Extraction and Separation Processes
- Copper Interconnects and Reliability
- Graphene research and applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced Battery Technologies Research
- Advanced battery technologies research
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Surface Polishing Techniques
- Semiconductor materials and interfaces
- Fiber-reinforced polymer composites
- Nanofabrication and Lithography Techniques
- Transition Metal Oxide Nanomaterials
- Fuel Cells and Related Materials
- Luminescence and Fluorescent Materials
- Molecular Sensors and Ion Detection
- Synthesis and properties of polymers
- Quantum Dots Synthesis And Properties
- Electrochemical Analysis and Applications
- 2D Materials and Applications
Samsung (South Korea)
2000-2024
Ulsan National Institute of Science and Technology
2024
Sungkyunkwan University
2016-2023
Government of the Republic of Korea
2021
The University of Texas at Austin
2007-2016
Twin Cities Orthopedics
2007-2009
University of Minnesota
2007-2009
IMEC
2006
Nanocomposites reinforced with graphite platelets were compared to those functionalized sheets (FGS) prepared by partial pyrolysis of oxide. Melt dispersion in poly(ethylene-2,6-naphthalate) (PEN) was quantified using a range characterization techniques: electron microscopy, X-ray scattering, melt rheology, electrical conductivity, gas barrier, and mechanical properties. Conductivity percolation obtained as little 0.3 vol % FGS, whereas 3 required for graphite. The threshold concentrations...
The poor catalyst stability in acidic oxidation evolution reaction (OER) has been a long-time issue. Herein, we introduce electron-deficient metal on semiconducting oxides-consisting of Ir (Rh, Au, Ru)-MoO3 embedded by graphitic carbon layers (IMO) using an electrospinning method. We systematically investigate IMO's structure, electron transfer behaviors, and OER catalytic performance combining experimental theoretical studies. Remarkably, IMO with surface (Irx+; x > 4) exhibit low...
On the basis of density functional theory calculations, we present energetics, structure, and electronic mechanical properties crystalline amorphous Li−Si alloys. We also discuss dynamic behavior alloys at finite temperatures based on ab initio molecular dynamics. When Li content is sufficiently high, alloying between Si energetically favorable as evidenced by negative mixing enthalpy; alloy most stable around 70 atom % in phase ± 5 phase. Our calculations unequivocally show that...
On the basis of density functional theory calculations, we first present a comparative study on behavior Li atoms in M (M = Si, Ge, and Sn) evaluate how incorporation affects electronic structure bonding nature host lattices. We then discuss energetics, structural evolution, variations mechanical properties crystalline amorphous Li–M alloys. Our calculations show that insertion is least favorable Si most Sn owing to its large effective interstitial space softer matrix. Upon incorporation,...
Quantum states of quasiparticles in solids are dictated by symmetry. Thus, a discovery unconventional symmetry can provide new opportunity to reach novel quantum state. Recently, Dirac and Weyl electrons have been observed crystals with discrete translational Here we experimentally demonstrate two-dimensional quasicrystal without A dodecagonal was realized epitaxial growth twisted bilayer graphene rotated exactly 30 degree. The grown up millimeter scale on SiC(0001) surface while maintaining...
Because of the salient impact on performance oxygen evolution reaction (OER), surface dynamics precatalysts accompanying oxidation and dissolution catalytic components demands immense research attention. Accordingly, change in structural integrity under high current density generally results inconsistent OER performances. To address this challenge, here, we present intricate design precatalysts, strategically followed by reconstruction treatment presence Fe water condition, which...
Abstract Lithium rich layered oxide xLi 2 MnO 3 ∙(1−x)LiMO (M = Mn, Co, Ni, etc.) materials are promising cathode for next generation lithium ion batteries. However, the understanding of their electrochemical kinetic behaviors is limited. In this work, phase separation and kinetics 0.5Li ∙0.5LiCoO with various Li domain sizes were studied. Despite having similar morphological, crystal local atomic structures, exhibited different behavior resulting in disparate transport kinetics. For first...
Noble-metal-oxide support catalysts have been demonstrated to be unique for electrocatalytic water oxidation in acidic media. Highly porous three-dimensional oxide supported can serve as an ideal platform confine ultrasmall metal on specific sites and modulate their reactivity, resulting the reduction of noble content catalyst by boosting mass activity. However, due poor control over morphology, geometric-driven shifts activity metal-oxide oxygen evolution reaction media not realized....
Although lithium-ion batteries are currently the most reliable power supply system for various mobile applications, further improvement in energy density is still required as need large energy-consuming devices rapidly growing. However, anode, widely commercialized graphite-based anode materials almost face theoretical limitations. In addition, sodium-ion have been actively studied to replace expensive charge carriers with cheaper ones. Accordingly, conversion-based extensively high-capacity...
Numerous studies have been conducted on a MoS2 material owing to its high capacity and good rate capability as promising substitute for commercial graphite materials in lithium-ion batteries. However, contrary the continuous improvement performance, mechanism of reversible storage remains still unclear. Herein, we carried out an in-depth study about lithium behavior during lithiation/delithiation process. The conversion reaction was verified by monitoring formation phase through X-ray...
Abstract In this study, four different MnO 2 polymorphs are synthesized with a controlled morphology of hollow porous structures to systematically investigate the influences in conversion‐based material. As structure these materials transforms into nanosized metal and maintains an extremely low‐crystalline phase during cell operation, effects overlooked as compared case insertion‐based materials. Thus, differences ion storage behaviors among various not well identified. Herein, structural...
Metallic lithium storage occurs in MoO 2 , whereas 3 store by conversion reaction. First-principles calculations demonstrate that the different electrochemical properties originated from metal–oxygen bonding of and .
Understanding thermal behaviors of energy storage materials according to the charged states is essential uncover key factors for improving stability. Herein, we trace crystallographic changes Ni-based layered during an increase in external temperature three different states-of-charges. The most remarkable aspect that onset formation disordered spinel structure dominantly influenced by intermediate tetrahedron size, space through which cations pass. However, completion determined Li contents...
Abstract To further increase the energy density of rechargeable batteries to meet rapidly growing needs high‐energy consuming devices, various materials are tested as anode materials. Some these newly developed exhibit anomalously high capacities that exceed their theoretical values. Advanced analytical techniques have revealed unconventional reaction mechanisms account for extra capacities. However, despite potential take current battery technology development next level, research on...