A5006231132- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Advanced Electron Microscopy Techniques and Applications
- Advanced battery technologies research
- Advanced Photocatalysis Techniques
- Ammonia Synthesis and Nitrogen Reduction
- Semiconductor materials and devices
- 2D Materials and Applications
- Electron and X-Ray Spectroscopy Techniques
- Chalcogenide Semiconductor Thin Films
- Nanomaterials for catalytic reactions
- MXene and MAX Phase Materials
- Graphene research and applications
- Phase-change materials and chalcogenides
- Hydrogen Storage and Materials
- Organic Light-Emitting Diodes Research
- Ion-surface interactions and analysis
- Quantum Dots Synthesis And Properties
- Advanced Battery Materials and Technologies
- Semiconductor materials and interfaces
- CO2 Reduction Techniques and Catalysts
- Aluminum Alloy Microstructure Properties
- Carbon dioxide utilization in catalysis
- Nanomaterials and Printing Technologies
- Dielectric properties of ceramics
Korea Institute of Energy Research
2021-2025
Sungkyunkwan University
2015-2023
Government of the Republic of Korea
2020
Suwon Research Institute
2020
Abstract Generation of hydrogen fuel via electrochemical water splitting powered by sustainable energy, such as wind or solar is an attractive path toward the future renewable energy landscape. However, current electrolysis requires desalinated resources, eventually leading to costs and scarcity. The development cost‐effective electrocatalysts capable saline feeds directly can be evident solution. Herein, a surface reconstructed nickel‐iron layered double hydroxide (NF‐LDH) reported...
Abstract Nickel‐iron layered double hydroxides (Ni‐Fe LDHs) consist of stacked Fe 3+ ‐doped positively charged Ni‐hydroxide layers containing charge‐balancing anions and water molecules between the layers. Although Ni‐Fe LDHs are highly active in oxygen evolution reaction (OER) under alkaline conditions, their poor operational stability remains an issue. Herein, based on density functional theory calculations, it is proposed that inclusion a higher content (>40%) than theoretical limit...
Ammonia is a promising COx-free hydrogen (H2) carrier because of its high volumetric H2 density. However, developing highly active/stable ammonia decomposition catalysts for production remains challenging. In this study, the role ceria (CeO2) as promoter Ru-based was investigated. Ru/Cex/MgAl(y00) were prepared by incipient wetness impregnation (IWP) and deposition–precipitation (DP) methods. The surface oxygen vacancy (OV) concentration controlled Ce loading calcination temperature. By...
The metallic 1T phase of WS2 (1T-WS2 ), which boosts the charge transfer between electron source and active edge sites, can be used as an efficient electrocatalyst for hydrogen evolution reaction (HER). As semiconductor 2H (2H-WS2 ) is inherently stable, methods synthesizing 1T-WS2 are limited complicated. Herein, a uniform wafer-scale film prepared using plasma-enhanced chemical vapor deposition (PE-CVD) system. growth temperature maintained at 150 °C enabling direct synthesis films on both...
Single-atom catalysts (SACs) are being widely developed for the CO2 reduction reaction (CO2RR) because of their remarkable activity and selectivity. However, insufficient CO2RR performance poor long-term stability SACs remain obstacles to process scale-up. Herein, we explore Ni (Ni-N/NCNT) under practical conditions using a zero-gap electrolyzer CO production. We demonstrate that Ni-N/NCNT results from suitable Ni–N–C, which enhanced electron transfer increased adsorption. Furthermore,...
In this study, we developed a roll-to-roll Ag electroplating process for metallic nanowire electrodes using galvanostatic mode. Electroplating is low-cost and facile method deposition of metal onto target surface with precise control both the composition thickness. Metallic networks [silver nanowires (AgNWs) copper (CuNWs)] coated polyethylene terephthalate (PET) film were immersed directly in an bath containing AgNO3. Solvated silver ions (Ag+ ions) deposited through application constant...
Ni-based porous electrocatalysts have been widely used in the hydrogen evolution reaction (HER) alkaline water electrolysis, and catalysts are produced by selective leaching of Al from Ni-Al alloys. It is well known that chemical intermetallic compound (IMC) generates a high surface area Ni(OH)2. However, Ni(OH)2 retards reaction, which attributed to its weak adsorption energy. In this study, we controlled state Ni using plasma vapor deposition (PVD) followed heat treatment, leaching,...
Oxygen evolution reaction (OER) under acidic conditions becomes of significant importance for the practical use a proton exchange membrane (PEM) water electrolyzer. In particular, maximizing mass activity iridium (Ir) is one maiden issues. Herein, authors discover that Ir-doped calcium copper titanate (CaCu₃Ti₄O₁₂, CCTO) perovskite exhibits ultrahigh up to 1000 A gIr-1 OER, which 66 times higher than benchmark catalyst, IrO2 . By substituting Ti with Ir in CCTO, metal-oxygen (M-O) covalency...
The low sheet resistance and high optical transparency of silver nanowires (AgNWs) make them a promising candidate for use as the flexible transparent electrode light-emitting diodes (LEDs). In perovskite LED (PeLED), however, AgNW can react with overlying material by redox reactions, which limit electroluminescence efficiency PeLED causing degradation generating defect states in material. this study, we prepared Ag-Ni core-shell NW electrodes using solution-electroplating technique to...
Abstract The octahedral structure of 2D molybdenum disulfide (1T‐MoS 2 ) has attracted attention as a high‐efficiency and low‐cost electrocatalyst for hydrogen production. However, the large‐scale synthesis 1T‐MoS films not been realized because higher formation energy compared to that trigonal prismatic phase (2H)‐MoS . In this study, uniform wafer‐scale metastable film is performed by sulfidation Mo metal layer using plasma‐enhanced chemical vapor deposition (PE‐CVD) system. Thus,...
The size of the advanced Cu interconnects has been significantly reduced, reaching current 7.0 nm node technology and below. With relentless scaling-down microelectronic devices, thus requires an ultrathin reliable diffusion barrier layer to prevent into surrounding dielectric. In this paper, amorphous carbon (a-C) layers 0.75–2.5 thickness have studied for use as copper barriers. performance thermal stability a-C were evaluated by annealing Cu/SiO2/Si metal-oxide-semiconductor (MOS) samples...
Corrosion resistance of Zr that has been added to an Al alloy (U1070) is higher than a commercial (A1070). A decreasing number and size Al3Fe intermetallic particles (IMPs) were observed by electron microprobe analysis transmission microscopy. Based on the numerical corrosion simulation, it was confirmed IMPs favorable for improving due reduction galvanic effect. In addition, Al3Zr found be insignificant in promoting within matrix. Thus, advantageous alloying element alloy.
The electrochemical synthesis of ammonia at ambient temperature and pressure has the potential to replace conventional process for production ammonia. However, low yield poor long-term stability catalysts hinders application this technology. Herein, we endeavored tackle challenge by synthesizing 3-D vertical graphene (VG) on Ni foam via a one-step, low-temperature plasma process, which offered high conductivity large surface area. Subsequently, was loaded with nanolayers ruthenium oxide...
The thermal transport across the grain boundary (GB) is inevitably encountered for large-area polycrystalline graphene. However, influence of GB configuration on not well understood. Here we investigated effect misorientation angle in-plane conductivity (κ) suspended graphene by using optothermal Raman technique. Graphene with well-defined orientation was synthesized an electropolished, annealed, and oxygen plasma-treated single-crystalline Cu(111) substrate low-pressure chemical vapor...
Cost-effective and nonprecious iron-based catalysts were synthesized, evaluated, compared for electrocatalytic N2 reduction reaction (NRR) under alkaline conditions in the potential range from -0.4 to 0.1 V [vs reversible hydrogen electrode (RHE)] at low temperature (≤60 °C) atmospheric pressure. The tested H-type cell was separated by an anion exchange membrane 6 M KOH electrolyte (pH = over 14) order minimize evolution directly form NH3 gas. amount of ammonia synthesized quantified using...