A5078886160- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Supercapacitor Materials and Fabrication
- ZnO doping and properties
- Luminescence Properties of Advanced Materials
- Perovskite Materials and Applications
- Ga2O3 and related materials
- Advancements in Battery Materials
- GaN-based semiconductor devices and materials
- Advanced Photocatalysis Techniques
- Fuel Cells and Related Materials
- Graphene research and applications
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Electrochemical Analysis and Applications
- Semiconductor Quantum Structures and Devices
- Advanced Memory and Neural Computing
- Nanomaterials for catalytic reactions
- Organic Light-Emitting Diodes Research
- Semiconductor materials and devices
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- Microwave Dielectric Ceramics Synthesis
- Semiconductor Lasers and Optical Devices
Soonchunhyang University
2021-2025
Korea Electronics Technology Institute
2018-2021
BASF (United States)
2021
The University of Texas at Dallas
2021
Government of the Republic of Korea
2017-2020
Seonam University
2019-2020
Sungkyunkwan University
2009-2018
Sejong University
2018
Center for Integrated Nanotechnologies
2018
Los Alamos National Laboratory
2018
We report on reduced graphene oxide (rGO)/mesoporous (mp)-TiO2 nanocomposite based mesostructured perovskite solar cells that show an improved electron transport property owing to the interfacial resistance. The amount of rGO added TiO2 nanoparticles layer was optimized, and their impacts film resistivity, diffusion, recombination time, photovoltaic performance were investigated. rGO/mp-TiO2 reduces resistance when compared mp-TiO2 film, hence, it improves charge collection efficiency. This...
The mesoporous NiO/NiFe<sub>2</sub>O<sub>4</sub>multi-composite hollow nanocage electrodes are fabricated and achieve a low overpotential (303 mV at 10 cm<sup>−2</sup>) Tafel plot (58.5 dec<sup>−1</sup>), respectively, excellent cycling stability (12 h) as an anode material for oxygen evolution reaction, holding great promise water splitting.
Abstract The effect of the doping configuration and concentration nitrogen (N) sulfur (S) on electrochemical performance 3 D N S co‐doped hole defect graphene hydrogel (NS‐HGH) electrodes is investigated. Surprisingly, by introducing a surface, difference in concentrations can be used to effectively modulate behavior NS‐HGH. defects provide rapid ion diffusion path. Finally, we showed that intriguing specific capacitance (536 F g −1 ) NS‐HGH could enhance overall pseudocapacitance electric...
There have been rapidly increasing demands for flexible lighting apparatus, and micrometer-scale light-emitting diodes (LEDs) are regarded as one of the promising sources deformable device applications. Herein, we demonstrate a method creating LED, based on remote heteroepitaxy GaN microrod (MR) p-n junction arrays c-Al2O3 wafer across graphene. The use graphene allows transfer MR LED onto copper plate, spatially separate offer ideal geometry suitable in various shapes without serious...
Abstract Water electrolyzers powered by renewable energy are emerging as clean and sustainable technology for producing hydrogen without carbon emissions. Specifically, anion exchange membrane (AEM) utilizing non‐platinum group metal (non‐PGM) catalysts have garnered attention a cost‐effective method production, especially when integrated with solar cells. Nonetheless, the progress of such systems is hindered inadequate water electrolysis efficiency, primarily caused poor oxygen evolution...
Nickel cobalt sulfide nanoparticles embedded in holey defect graphene hydrogel (HGH) that exhibit highly porous structures and uniform nickel nanoparticle sizes are successfully prepared by a facile solvothermal-hydrothermal method. As an electrode material for supercapacitors, the as-prepared NiCo2 S4 @HGH shows ultra-high specific capacitances of 1000 F g-1 800 at 0.5 6 A , respectively, owing to outstanding electrical conductivity HGH high capacitance . After 2100 charge/discharge cycles...
We report highly efficient ethyl cellulose with CsPbBr3 perovskite QD films for white light generation in LED application. Ethyl quantum dots is applied Sr2Si5N8 : Eu2+ red phosphor on an InGaN blue chip, achieving a luminous efficacy of 67.93 lm W−1 under 20 mA current.
Ni 3 FeN and a N-doped carbon shell have improved electrical conductivity with the electronic structure modified through extra electrons of nitrogen. FeN@NC in water splitting reaction provide excellent electrochemical catalytic properties.
Abstract Combining an electrochemically stable material onto the surface of a catalyst can improve durability transition metal catalyst, and enable to operate stably at high current density. Herein, contribution N‐doped carbon shell (NCS) electrochemical properties is evaluated by comparing characteristics Ni 3 Fe@NCS with shell, Fe catalyst. The synthesized has distinct overpotential difference from ( η OER = 468.8 mV, HER 462.2 mV) (200 −200) mA cm −2 in 1 m KOH. In stability test (10 −10)...
An organic–inorganic perovskite solar cell (PSC) is a very promising candidate for next-generation photovoltaic system.
With advancement of technology, requirements for light-emitting devices are increasing. Various types packaging technologies have been suggested to improve the performance diode (LED). Among them, phosphor in glass (PiG) is attracting attention due its manufactural facility and easily tunable characteristics. As PiG draws increasing attention, research on materials also being actively conducted. However, studies about field mainly conducted fabrication. Only a few recycling reported. Thus,...
Abstract Herein, we have designed a highly active and robust trifunctional electrocatalyst derived from Prussian blue analogs, where Co 4 N nanoparticles are encapsulated by Fe embedded in N‐doped carbon nanocubes to synthesize hierarchically structured N@Fe/N–C for rechargeable zinc–air batteries overall water‐splitting electrolyzers. As confirmed theoretical experimental results, the high intrinsic oxygen reduction reaction, evolution hydrogen reaction activities of were attributed...
The anion-exchange membrane water electrolyzer (AEM electrolyzer) is an advanced technology for the sustainable production of green hydrogen. However, its commercialization has been hindered by relatively low performance, which necessitates use platinum group metal (PGM)-based electrocatalysts. Herein, we address this challenge developing a composite material consisting non-PGM-based amorphous Cu(OH)2 and ZIF-67. abundant defects in modification electronic structure, induced strong...
Semiconductor epitaxy on two-dimensional materials is beneficial for transferrable and flexible device applications. Graphene, due to the absence of permanent electric dipoles, cannot screen field coming from opposite side surface, allowing remote heteroepitaxy. This study demonstrates heteroepitaxy ZnO microrods (MRs) GaN substrate across graphene layers via hydrothermal growth. Even use tri-layer yields heteroepitaxial MR arrays. Transmission electron microscopy reveals relation between...
To overcome the parasitic absorption of ultraviolet (UV) light in transparent conductive oxide (TCO) layer flexible Cu(In,Ga)Se2 (CIGS) thin film solar cells, a CsPbBr3 perovskite nanocrystal based luminescent down-shifting (LDS) was integrated on CIGS cells fabricated stainless steel foil. The absorbs irradiation at wavelengths shorter than 520 nm and emits photons wavelength 532 nm. These down-shifted pass TCO without are absorbed absorber where they generate photocurrent. By minimizing...
We report successfully synthesizing two-dimensional (2D) and nanocrystalline (NC) Fe2Ni2N/rGO nanohybrid sheets (NHSs) via ammonolysis of as-prepared 2D Ni2.25Fe0.75[Fe(CN)6]2/rGO precursors. compared the electrochemical properties 2D-NC NHSs as non-precious-metal nitride graphene electrocatalysts for an oxygen evolution reaction (OER) with those NiFe-based composition. The overpotential Tafel plot had their lowest values 290 49.1 mV dec–1, respectively, at a current density 10 mA cm–2 (0.1...