A5100750096- Electrocatalysts for Energy Conversion
- Silicon Nanostructures and Photoluminescence
- Nanowire Synthesis and Applications
- 2D Materials and Applications
- Hybrid Renewable Energy Systems
- Perovskite Materials and Applications
- MXene and MAX Phase Materials
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Surfactants and Colloidal Systems
- Electric Vehicles and Infrastructure
- Semiconductor materials and interfaces
- Block Copolymer Self-Assembly
- Fuel Cells and Related Materials
- Advanced Photocatalysis Techniques
- Advanced Battery Technologies Research
- Catalytic Processes in Materials Science
- TiO2 Photocatalysis and Solar Cells
- Advanced battery technologies research
- Copper-based nanomaterials and applications
- Analytical Chemistry and Sensors
- Polymer Surface Interaction Studies
- Advanced Chemical Sensor Technologies
- Pigment Synthesis and Properties
- Nanomaterials and Printing Technologies
Seoul National University
2011-2024
Pusan National University
2023-2024
Stanford University
2016-2022
Kangwon National University
2020-2022
UNSW Sydney
2007-2008
ARC Centre of Excellence in Advanced Molecular Imaging
2007-2008
Hanyang University
2001-2006
Virginia Tech
2003
Korea Institute of Science and Technology
2001-2003
LG Chem (South Korea)
2001
Abstract Recently, sulfur (S)-vacancies created on the basal plane of 2 H -molybdenum disulfide (MoS ) using argon plasma exposure exhibited higher intrinsic activity for electrochemical hydrogen evolution reaction than edge sites and metallic 1 T -phase MoS catalysts. However, a more industrially viable alternative to desulfurization process is needed. In this work, we introduce scalable route towards generating S-vacancies desulfurization. Even though atoms are known be stable inert, find...
Silicon (Si) quantum dot (QD) materials have been proposed for 'all-silicon' tandem solar cells. In this study, cells consisting of phosphorus-doped Si QDs in a SiO2 matrix deposited on p-type crystalline substrates (c-Si) were fabricated. The formed by alternate deposition and silicon-rich SiOx with magnetron co-sputtering, followed high-temperature annealing. Current tunnelling through the QD layer was observed from spacing 2 nm or less. To get required current densities devices, had to be...
Photoelectrochemical oxidation of water presents a pathway for sustainable production hydrogen peroxide (H2O2). Two-electron toward H2O2, however, competes with the popular four-electron process to form oxygen and one-electron OH radical. To date, bismuth vanadate (BiVO4) has been shown exhibit promising selectivity especially under illumination, but it suffers from high overpotential notoriously poor stability. Herein, using density functional theory calculations, we predict that doping...
The basal plane of molybdenum disulfide (MoS2) was recently activated for hydrogen evolution reaction (HER) by creating sulfur (S) vacancies (MoS2–x). However, the HER activity those S-vacancies depends on concentration S-vacancies, imposing a dilemma either improving per site or increasing overall active density. Herein, we use density functional theory (DFT) calculations and experiments to show that activities MoS2–x are greatly enhanced adding cobalt (Co) clusters plane. Our DFT results...
Copper ferrite (CuFe2O4) possesses an indirect bandgap in the range of 1.54–1.95 eV. It is used as attractive p-type photocathode photoelectrochemical (PEC) water splitting, and theoretically it can yield a maximum photocurrent density ∼27 mA/cm2 solar-to-hydrogen conversion efficiency ∼33%. To date, only few reports have been published on CuFe2O4 photocathodes with very low-photocurrent densities, value 0.4 at V vs RHE. Herein, we prepared FTO glass sol–gel method followed by either...
Monolayer MoS2 is a promising semiconductor to overcome the physical dimension limits of microelectronic devices. Understanding thermochemical stability essential since these devices generate heat and are susceptible oxidative environments. Herein, promoting effect molybdenum oxides (MoO x ) particles on thermal oxidation monolayers shown by employing operando X-ray absorption spectroscopy, ex situ scanning electron microscopy photoelectron spectroscopy. The study demonstrates that chemical...
As the demand for sustainable energy sources increases, water electrolysis has attracted huge attention in research fields due to its cleanliness and high purity of hydrogen generation. Electrolysis technology involves splitting molecules into oxygen using electricity. The combined with renewable electricity makes it a key method producing sustainably. Herein, we present comprehe1nsive review systems efficient production. First, representative components membrane electrode assembly (MEA)...
We report work progress on the growth of Si quantum dots in different matrices for future photovoltaic applications. The reported here seeks to engineer a wide-bandgap silicon-based thin-film material by using confinement silicon and utilize this complete tandem cell, without constraints lattice matching, but which nonetheless gives an enhanced efficiency through increased spectral collection efficiency. Coherent-sized dots, dispersed matrix carbide, nitride, or oxide, were fabricated...
The nature of the S-vacancy is central to controlling electronic properties monolayer MoS2. Understanding geometric and structures on basal plane MoS2 remains elusive. Here, operando S K-edge X-ray absorption spectroscopy shows formation clustered S-vacancies under reaction conditions (H2 atmosphere, 100-600 °C). First-principles calculations predict spectral fingerprints consistent with experimental results. Mo extended fine structure local as coordinatively unsaturated 4.1 ± 0.4 atoms...
Significance The ability to endow the surface of existing objects with desired electronic features enables many emerging applications such as Internet Things (IoT). Despite significant progress in optimization thin-film materials and construction schemes, realization high-performance electronics on arbitrary place through a wafer-scale batch process is limited. This paper presents wafer-recyclable, environment-friendly transfer printing that physical delivery large-scale integrated circuits...
A clean solar hydrail, a locomotive operated by and hydrogen energy, has received significant attention as an alternative to current fossil fuel-based locomotive. Nevertheless, the feasibility test of hydrail is still challenging since it not yet been practically developed. Herein, we employed digital twin technology design operate diesel 30 years operation simulation starting from 2021 was conducted based on data Gangwon-do, South Korea. It confirmed that replacing single with can provide...
Abstract The state‐of‐the‐art iridium and ruthenium oxides‐based materials are best known for high efficiency stability in acidic oxygen evolution reaction (OER). However, the development of economically feasible catalysts water‐splitting technologies is challenging by requirements low overpotential, stability, resistance to dissolution during . Herein, an organometallic core–shell heterostructure composed a carbon nanotube core (CNT) bismuth telluride (Bi 2 Te 3 ) shell (denoted as nC–Bi...
Diblock copolymer (A−B) behaviors in quasi-two-dimensional space have been examined where the A block is polystyrene (PS) and B poly(methyl methacrylate) (PMMA). The length of PMMA was varied while that PS kept almost same. surface pressure isotherms were determined with aid a Langmuir film balance. exhibited two phase transitions attributed to micelle formation at low further assembly micelles high pressure. Atomic force microscope images are correlated aggregates chains forming Chains...
Abstract Mesoporous TiO 2 nanoparticle (NP) films are broadly used as electrodes in photoelectrochemical cells, dye‐sensitized solar cells (DSSCs), and perovskite (PSCs). State‐of‐the‐art mesoporous NP for these fabricated by annealing paste‐coated fluorine‐doped tin oxide glass a box furnace at 500 °C ≈30 min. Here, the use of nontraditional reactor, i.e., flame, is reported high throughput ultrafast paste (≈1 min). This flame‐annealing method, compared to conventional annealing, exhibits...
In this study, we investigate phosphomolybdic acid (PMA), which allows solution processing of quantum dot light-emitting diodes. With its low cost, easy processes, and excellent physical optical properties, PMA is a potential candidate as the hole injection layer (HIL) in optoelectronic devices. We evaluate electrical properties using various solvents. The surface morphology film was improved solvent with appropriate boiling points, tension, viscosity to form smooth, pinhole-free film....
Abstract Forming pits on molybdenum disulfide (MoS 2 ) monolayers is desirable for (opto)electrical, catalytic, and biological applications. Thermal oxidation a potentially scalable method to generate monolayer MoS , are assumed preferentially form around undercoordinated sites, such as sulfur vacancies. However, studies thermal of have not considered the effect adventitious carbon (C) that ubiquitous interacts with oxygen at elevated temperatures. Herein, C pit formation during studied. The...
In the present study, jewel beetle Chrysochroa fulgidissima was taxonomically reassessed based on molecular analyses of cytochrome c oxidase subunit I (COI) and 16S ribosomal RNA (16S) gene partial sequences, morphological approaches, excluding subspecies adachii. Molecular (three data sets, COI, 16S, COI + in mtDNA) (quantitative qualitative characters) evidence suggested that Ch. consists four independent species found seven geographical regions, namely Korea, Japan Taiwan, China (GuangXi...
Abstract Solar electric vehicle (EV) charging stations offer a promising solution to an environmental issue related EVs by supplying eco-friendly electricity. Herein, we designed and analyzed grid-connected highway solar EV station for 2022, 2030, 2050 under two scenarios: Current policy scenario with restricted grid sales mitigation allowing sale. Future systems consider changes in station, CO 2 emissions, carbon prices, renewable costs. In high PV battery costs led grid-only system. By...