A5061056362- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Quantum Dots Synthesis And Properties
- Perovskite Materials and Applications
- Supercapacitor Materials and Fabrication
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Chalcogenide Semiconductor Thin Films
- Graphene research and applications
- Transition Metal Oxide Nanomaterials
- Electrocatalysts for Energy Conversion
- Advancements in Battery Materials
- Gas Sensing Nanomaterials and Sensors
- MXene and MAX Phase Materials
- Advanced battery technologies research
- Analytical Chemistry and Sensors
- Molecular Junctions and Nanostructures
- Organic Electronics and Photovoltaics
- Advanced Nanomaterials in Catalysis
- Force Microscopy Techniques and Applications
- Advanced Battery Materials and Technologies
- Nanowire Synthesis and Applications
- Solid-state spectroscopy and crystallography
- Mechanical and Optical Resonators
- Hydrogen Storage and Materials
Korea University
1999-2024
Korea Institute of Science and Technology
2023-2024
Government of the Republic of Korea
2015-2020
Konkuk University
2013-2019
Konkuk University Medical Center
2013-2018
Ulsan National Institute of Science and Technology
2009-2013
Electronics and Telecommunications Research Institute
2006-2012
Korea Basic Science Institute
2012
Kongju National University
2010
Sungkyunkwan University
2009
Abstract Although the power conversion efficiency of perovskite solar cells has increased from 3.81% to 22.1% in just 7 years, they still suffer stability issues, as degrade upon exposure moisture, UV light, heat, and bias voltage. We herein examined degradation presence light alone. The were exposed 365 nm for over 1,000 h under inert gas at <0.5 ppm humidity without encapsulation. 1-sun illumination after resulted recovery fill factor efficiency. Furthermore, during consecutive...
Few-layered MoSe<sub>2</sub> nanosheets are synthesized <italic>via</italic> a facile hydrothermal method. A symmetric two-electrode device consisting of showed enhanced performance and good capacitance retention over 10 000 cycles.
A stand-alone, wireless solar water splitting device without external energy supply has been realized by combining in tandem a CH3NH3PbI3 perovskite single junction cell with cobalt carbonate (Co-Ci)-catalyzed, extrinsic/intrinsic dual-doped BiVO4 (hydrogen-treated and 3 at% Mo-doped). The photoanode recorded one of the highest photoelectrochemical oxidation activity (4.8 mA/cm(2) at 1.23 VRHE) under simulated 1 sun illumination. oxygen evolution Co-Ci co-catalyst showed similar performance...
Conductive, flexible, and durable reduced RGO textiles with a facile preparation method are presented. BSA proteins serve as universal adhesives for improving the adsorption of GO onto any textile, irrespective materials surface conditions. Using this method, we successfully prepared various based on nylon-6 yarns, cotton polyester nonwoven fabrics.
Graphene-decorated V2O5 nanobelts (GVNBs) were synthesized via a low-temperature hydrothermal method in single step. (VNBs) formed the presence of graphene oxide, mild oxidant, which also enhanced conductivity GVNBs. From electron energy loss spectroscopy analysis, reduced oxide (rGO) are inserted into layered crystal structure nanobelts, further confirmed nanobelts. The electrochemical energy-storage capacity GVNBs was investigated for supercapacitor applications. specific capacitance...
Abstract Electric components based on fibers or textiles have been investigated owing to their potential applications in wearable devices. High performance response gas, drape-ability and washing durability are of important for gas sensors fiber substrates. In this report, we demonstrate the bendable washable electronic textile ( e -textile) composed reduced graphene oxides (RGOs) using commercially available yarn molecular glue through an electrostatic self-assembly. The -textile sensor...
Electrochemical alcohol oxidation is considered a promising alternative to the oxygen evolution reaction due production of high-value products and early onset potential. Herein, we analyze different reactivities NiOOH Cu(OH)2 toward electrochemical aldehyde on furan ring utilize their characteristics synergistically enhance performance 5-hydroxymethylfurfural (HMF) 2,5-furandicarboxylic acid (FDCA) conversion. We discovered that has higher reactivity for carboxylic than NiOOH, while...
Understanding electron transport in metal-molecule-metal (MMM) junctions is of great importance for the advancement molecular electronics. Critical factors that determine conductivity a MMM junction include nature metal-molecule contacts and electronic structure backbone. We have studied property valence on rigid, conjugated oligoacenes increasing length with either thiol (-S) or isocyanide (-CN) linkers using conducting probe atomic force microscopy (CP-AFM) ultraviolet photoelectron...
Dye-sensitized solar cells (DSSCs) have been extensively evolved for the past two decades in order to improve their cell performance. From commercialization point of view, overall electrical energy conversion efficiency should compete with other cells. But, due structural restrictions DSSC using liquid electrolyte and a space requirement between electrodes, direct tandem construction DSSCs by stacking repeating units is highly limited. In this feature article, important research trials...
Epidermal electronics are extensively explored as an important platform for future biomedical engineering. devices typically fabricated using high‐cost methods employing complex vacuum microfabrication processes, limiting their widespread potential in wearable electronics. Here, a low‐cost, solution‐based approach electroconductive reduced graphene oxide (RGO) sheets on elastic and porous poly(dimethylsiloxane) (PDMS) thin films multifunctional, high‐performance, graphene‐based epidermal...
In the present study, molybdenum diselenide/reduced graphene oxide (MoSe2/rGO) nanosheets were synthesized via a facile hydrothermal process and electrochemical performance of was evaluated for supercapacitor applications. The MoSe2 uniformly distributed on surface rGO matrix. MoSe2/rGO nanosheet electrode exhibited an enhanced specific capacitance (211 F g(-1)) with excellent cycling stability, compared pristine MoSe2. is mainly attributed to improved electron ion transfer mechanism...
We report the preparation of highly interconnected ordered mesoporous carbon–carbon nanotube nanocomposites which show Pt-like dye-sensitized solar cell (DSSC) efficiency and remarkable long-term durability as DSSC counter electrodes.
Abstract Flexible perovskite solar cells (FPSCs) have various applications such as wearable electronic textiles and portable devices. In this work, we demonstrate FPSCs on a titanium metal substrate employing solution‐processed silver nanowires (Ag NWs) the top electrode. The Ag NW electrodes were deposited of spiro‐MeOTAD hole transport layer by carefully controlled spray‐coating method at moderate temperatures. power conversion efficiency (PCE) reached 7.45 % under AM 1.5 100 mW cm −2...
Organometallic halide perovskite solar cells (PSCs) have unique photovoltaic properties for use in next-generation energy harvesting systems. The highest efficiency of PSCs reached 22.1% on a laboratory scale <0.1 cm2 device area. Thus, scaling up is the next step toward commercialization, but difficulty controlling quality large-area thin films remains fundamental challenge. It has also been frequently reported that J- V hysteresis intensified with areas larger than 1 cm2. In this study, we...
Flexible perovskite solar cells have been developed on a metal substrate using silver thin film as the top electrode.
Thin colloidal crystals (or synthetic opals) composed of Stober silica spheres typically develop cracks when they are utilized to obtain photonic band gap inverted opals). We find that by sintering the prior assembly opal these can be avoided. report effects temperature and duration heat treatment on 850 nm using electron microscopy, thermogravimetry, light scattering. also a large dependence refractive index treatment. This may allow tuning spheres.
Highly efficient dye-sensitized solar cells using a flexible stainless steel substrate for preparation of mesoporous film electrode were fabricated by controlling the dark current density. Optimal photovoltaic properties obtained with cell where was coated on Ti-isopropoxide-treated steel–based substrate. The quality underlayer characterized and found to be related properties.
A step towards commercialization of dye-sensitized solar cells (DSSCs) requires more attention to engineering aspects, such as flexibility, the roll fabrication process, use cost effective materials, etc. In this aspect, advantages flexible DSSCs attracted many researchers contemplate transparent conducting oxide coated plastic substrates and thin metallic foils. feature article, pros cons these two kinds are compared. The fabricated using metal briefly discussed. working electrodes on...
The tubular-shaped nanostructure of TiO(2) is very interesting, and highly ordered arrays nanotubes (TNTs) can be easily fabricated by anodization the Ti substrate in specific electrolytes. Here this feature article, we review synthesis methods for various TNTs including normal, alloy, architectural forms such as bamboos, lace, flowers. Specific nanosize architectures bamboo lace types regulated alternating voltage further anodizing. In order to extend light response visible solar spectra,...