A5024874071- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Graphene research and applications
- Carbon Nanotubes in Composites
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Hydrogen Storage and Materials
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Battery Technologies Research
- Synthesis and properties of polymers
- Fiber-reinforced polymer composites
- Advanced Sensor and Energy Harvesting Materials
- Polymer Nanocomposites and Properties
- Organic Electronics and Photovoltaics
- Advanced Thermoelectric Materials and Devices
- Advanced battery technologies research
- Electromagnetic wave absorption materials
- Thermal Radiation and Cooling Technologies
- Polymer crystallization and properties
- Fuel Cells and Related Materials
- Recycling and Waste Management Techniques
- Graphene and Nanomaterials Applications
- Thermal properties of materials
- Nanotechnology research and applications
- Supramolecular Self-Assembly in Materials
Seoul National University
2015-2024
Materials Design (France)
2023
Seoul Institute
2017-2020
Inha University
2020
University of Seoul
2014-2017
Materials Science & Engineering
2014-2017
Government of the Republic of Korea
2017
GE Global Research (United States)
2014
National University
2013
Korea Institute of Science and Technology
2013
Highly porous carbon has played an important role in tackling down the energy and environmental problems due to their attractive features such as high specific surface area (SSA), stability, mass productivity. Especially, desirable characteristics of highly lightweight, fast adsorption/desorption kinetics, SSA have attracted extensive attention "hydrogen storage" application which is a main bottleneck for realization on-board hydrogen fuel cell vehicles. We herein presented with hierarchical...
Hierarchically porous carbon-coated ZnO quantum dots (QDs) (~3.5 nm) were synthesized by a one-step controlled pyrolysis of the metal-organic framework IRMOF-1. We have demonstrated scalable and facile synthesis QDs without agglomeration structural reorganization. This unique microstructure exhibits outstanding electrochemical performance (capacity, cyclability, rate capability) when evaluated as an anode material for lithium ion batteries.
Abstract The lithium–sulfur (Li–S) battery is considered as a promising future energy storage device owing to its high theoretical density, low cost of the raw active material (sulfur), and environmental friendliness. On other hand, there are still challenging issues for practical applications Li–S batteries, including sulfur utilization, poor cyclability, rate capability. Although considerable efforts made overcome current obstacles in one far from meeting requirements commercialization...
Metal−organic frameworks (MOFs) are a rapidly growing class of microporous materials. Various MOFs with tailored nanoporosities have recently been developed as potential storage media for natural gases and hydrogen. However, wider applications limited because even atmospheric moisture levels cause MOF instability, unexpectedly low H2 capacity, at 298 K. To overcome these problems, we synthesized hybrid composite acid-treated multiwalled carbon nanotubes (MWCNTs) MOF-5 [Zn4O(bdc)3; bdc =...
Hummers method has been used for 50 years to prepare graphene oxide (GO) by oxidizing graphite using Mn2O7. In this work, a new angle on is described. The oxidation procedure before the addition of water, which respected as main step method, named I oxidation, and widely ignored further after water II oxidation. chemical structural evolutions during was demonstrated first time various techniques including atomic force microscopy (AFM), dynamic light scattering (DLS), X-ray photoelectron...
As practical interest in flexible/or wearable power-conversion devices increases, the demand for high-performance alternatives to thermoelectric (TE) generators based on brittle inorganic materials is growing. Herein, we propose a flexible and ultralight TE generator (TEG) carbon nanotube yarn (CNTY) with excellent performance. The as-prepared CNTY shows superior electrical conductivity of 3147 S/cm due increased longitudinal carrier mobility derived from highly aligned structure. Our TEG...
To allow for the use of graphene in various nanoelectronic applications, methods large-scale production with controllable electrical properties need to be developed. Here, we report results a fundamental study on remarkable conversion between n- and p-type reduced oxide (rGO) changes thermal annealing temperature. It was found that charge carriers rGO temperatures 300–450 °C 800–1000 are electrons (n-type), whereas 450–800 °C, they holes (p-type). This is because individual oxygen functional...
Abstract Developing methods to assemble nanomaterials into macroscopic scaffolds is of critical significance at the current stage nanotechnology. However, complications fabrication impede widespread usages newly developed materials even with superior properties in many cases. Here, we demonstrate feasibility a highly-efficient and potentially-continuous fiber-spinning method produce high-performance carbon nanotube (CNT) fiber (CNTF). The processing time <1 min from synthesis CNTs highly...
Displaying information on transparent screens offers new opportunities in next-generation electronics, such as augmented reality devices, smart surgical glasses, and windows. Outstanding luminance transparency are essential for "see-through" displays to show vivid images over clear background view. Here quantum dot light-emitting diodes (Tr-QLEDs) reported with high brightness (bottom: ≈43 000 cd m-2 , top: ≈30 total: ≈73 at 9 V), excellent transmittance (90% 550 nm, 84% visible range), an...
As commercial interest in flexible power‐conversion devices increases, the demand for high‐performance alternatives to brittle inorganic thermoelectric (TE) materials is growing. an alternative, we propose a rationally designed graphene/polymer/inorganic nanocrystal free‐standing paper with high TE performance, flexibility, and mechanical/chemical durability. The ternary hybrid system of includes two heterojunctions that induce double‐carrier filtering, which significantly increases...
The development of one-dimensional fluorescent nanowires (1D-NWs) and their higher-dimensional architectures such as nanowebs nanofabrics (2D-NFs) could open a new area in nanomaterials science nanotechnology. In particular, pi-electronic 1D-NWs are considered promising materials for realizing innovative nanodevices together with semiconductors metallic NWs. We earlier reported that 1-cyano-trans-1,2-bis-(3',5'-bis-trifluoromethyl-biphenyl)ethylene (CN-TFMBE), simple but very peculiar...
Partially deacetylated chitins with different degrees of deacetylation (DD) were prepared by alkaline treatment under homogeneous conditions, and the effect DD on their solubility was discussed in terms crystal structure mode hydrogen bonding. With an increase time, chitin increased proportionally. The became soluble dilute acetic acid at ca. 28% or over water 49%. partially had a close relationship structure, crystallinity, imperfection as well glucosamine content. wide-angle X-ray...
Precise control of the size and structure is one critical design parameter micellar systems for drug delivery applications. To self-aggregates, chitosan was depolymerized with various amounts sodium nitrite, hydrophobically modified deoxycholic acid to form self-aggregates in aqueous media. Formation physicochemical characteristics size-controlled were investigated using dynamic light scattering, fluorescence spectroscopy, computer simulation method. The varied range 130−300 nm diameter,...
A straightforward method for significantly improving the moisture resistance of MOFs is described. In proposed method, are subjected to thermal treatment, thus inducing formation an amorphous carbon coating on MOF surfaces that prevents hydrolysis. This approach should open up new practical applications in areas hitherto unexplored due concerns regarding sensitivity.
The battery–supercapacitor hybrid electrode, consisting of both faradaic rechargeable battery components and non-faradaic supercapacitor in a single is successfully developed using Li4Ti5O12–activated carbon (LTO–AC) nanotubes negative electrode for an advanced energy storage device. Li4Ti5O12 PVA-derived activated are hybridized with morphological control over the one-dimensional (1D) tubular structures via situ sol–gel reaction combined electrospinning, followed by hydrothermal appropriate...
1T exfoliated MoS<sub>2</sub>@CNT-based bifunctional separators in a tandem configuration delivered excellent electrochemical performance, and rational guidelines for preparing lithium sulfur batteries were suggested.