A5033839627- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Energetic Materials and Combustion
- Copper-based nanomaterials and applications
- Rocket and propulsion systems research
- Fuel Cells and Related Materials
- Gas Sensing Nanomaterials and Sensors
- TiO2 Photocatalysis and Solar Cells
- Iron oxide chemistry and applications
- Fullerene Chemistry and Applications
- Polymer Nanocomposites and Properties
- Boron and Carbon Nanomaterials Research
- Thermal and Kinetic Analysis
- Advanced battery technologies research
- Ga2O3 and related materials
- Catalysis and Hydrodesulfurization Studies
- Cardiac Health and Mental Health
- Chalcogenide Semiconductor Thin Films
- Superconductivity in MgB2 and Alloys
- Electronic and Structural Properties of Oxides
- Bipolar Disorder and Treatment
- Perovskite Materials and Applications
- Solar-Powered Water Purification Methods
- MXene and MAX Phase Materials
Massachusetts General Hospital
2025
Samsung Medical Center
2025
Sungkyunkwan University
2016-2025
Stanford University
2019-2025
Government of the Republic of Korea
2019
Suwon Research Institute
2019
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...
Coupling dissimilar oxides in heterostructures allows the engineering of interfacial, optical, charge separation/transport and transfer properties photoanodes for photoelectrochemical (PEC) water splitting. Here, we demonstrate a double-heterojunction concept based on BiVO4/WO3/SnO2 triple-layer planar heterojunction (TPH) photoanode, which shows simultaneous improvements transport (∼93% at 1.23 V vs RHE) transmittance longer wavelengths (>500 nm). The TPH photoanode was prepared by facile...
Developing stable and efficient electrocatalysts is vital for boosting oxygen evolution reaction (OER) rates in sustainable hydrogen production. High-entropy oxides (HEOs) consist of five or more metal cations, providing opportunities to tune their catalytic properties toward high OER efficiency. This work combines theoretical experimental studies scrutinize the activity stability spinel-type HEOs. Density functional theory confirms that randomly mixed sites show thermodynamic stability,...
Photoelectrochemical (PEC) water splitting has been extensively studied as a method to convert sunlight and hydrogen.
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...
Electrolysis coupled with renewable energy is essential for green hydrogen production and its application to achieving deep decarbonization. The efficiency of electrolysis limited by the oxygen evolution reaction (OER), which requires an efficient, low-cost, acid-stable catalyst proton exchange membrane (PEM) electrolysis. In this work, we designed a highly active, involving iridium-tungsten trioxide (Ir:WO3/Ir). Our theory predicts that high-valence Ir atoms are active sites OER they can be...
Boron has been regarded as a promising high-energy fuel due to its high volumetric and gravimetric heating values. However, it remains challenging for boron attain theoretical heat of combustion because the existence native oxide layer melting boiling temperatures that delay ignition inhibit complete combustion. is known be enhanced by physically adding fluorine-containing chemicals, such fluoropolymer or metal fluorides, remove surface oxides. Herein, we chemically functionalize particles...
Abstract Electrochemical two-electron water oxidation reaction (2e-WOR) has drawn significant attention as a promising process to achieve the continuous on-site production of hydrogen peroxide (H 2 O ). However, compared cathodic H generation, anodic 2e-WOR is more challenging establish catalysts due severe oxidizing environment. In this study, we combine density functional theory (DFT) calculations with experiments discover stable and efficient perovskite catalyst for 2e-WOR. Our...
Abstract Alkaline water splitting electrocatalysts have been studied for decades; however, many difficulties remain commercialization, such as sluggish hydrogen evolution reaction (HER) kinetics and poor catalytic stability. Herein, by mimicking the bulk‐heterojunction morphology of conventional organic solar cells, a uniform 10 nm scale nanocube is reported that consists subnanometer‐scale heterointerfaces between transition metal phosphides oxides, which serves an alkaline electrocatalyst;...
High-speed air-breathing propulsion systems, such as solid fuel ramjets (SFRJ), are important for space exploration and national security. The development of SFRJ requires high-performance fuels with excellent mechanical combustion properties. One the current candidates is composed high-energy particles (e.g., boron (B)) polymeric binder hydroxyl-terminated polybutadiene (HTPB)). However, opposite polarities surface HTPB lead to poor B particle dispersion distribution within HTPB. Herein, we...
Aluminum (Al) is a widely used metal fuel for energetic applications ranging from space propulsion and exploration, materials processing, to power generation nano- microdevices due its high energy density earth abundance. Recently, the ignition combustion performance of Al particles were found be improved by graphene-based additives, such as graphene oxide (GO) fluoride (GF), their reactions provide heat accelerate oxidation, gas reduce particle agglomeration, fluorine-containing species...
Abstract Nonprecious metal‐based 2D materials have shown promising electrocatalytic activity toward the oxygen evolution reaction (OER). However, catalytically active sites of are mainly presented at edge, and most their basal planes still inactive, which turns into a significant drawback on catalytic efficiency. Here, novel p–n heterojunction strategy is suggested that generates plane NiFe‐layered double hydroxide (NiFe‐LDH). The n‐type NiFe‐LDH first grown nickel foam (NF) substrate,...
Boron (B), with high energy density and low cost, is regarded as a promising fuel for energetic applications such propellants. However, achieving efficient combustion of B challenging due to its delayed ignition slow combustion. Additives are needed promote the particles by providing heat, gases, and/or fluorine-containing species. In this study, we demonstrated that mixture graphene oxide (GO) graphite fluoride (GtF) new effective additive particles. We compared performance B/GO/GtF...
High-entropy metal oxides (HEOs) have recently received growing attention for broad energy conversion and storage applications due to their tunable properties. HEOs typically involve the combination of multiple cations in a single oxide lattice, thus bringing distinctive structures, controllable elemental composition, functional Many synthesis methods been reported, such as solid-state reactions carbon thermal shock methods. These frequently are energy-intensive or require relatively...
Individuals with bipolar disorder are at greater risk of developing cardiovascular disease. However, the mechanisms underlying this association remain poorly understood. This study aimed to (1) determine major adverse events (MACE) after adjusting for important confounders and (2) evaluate neural, autonomic, immune link between Leveraging Mass General Brigham Biobank, incident MACE were identified using International Classification Disease (ICD) codes. Incident assessed from enrollment date...
Although various highly active transition metal-based electrocatalysts have been identified for the anodic oxygen evolution reaction (OER) alkaline water electrolysis, necessity of a binder to coat onto conductive supports affects overall durability. Thus, developing active, durable, and binder-free anode is beneficial advancing electrolysis broader applications. This study presents new yet effective surface sulfidation method converting commercial FeNiCo alloy, Kovar, into stable, OER...
There remains continued interest in improving the advanced water oxidation process [e.g., ultraviolet (UV)/hydrogen peroxide (H2O2)] for more efficient and environmentally friendly wastewater treatment. Here, we report design, fabrication, performance of graphene oxide (GO, on top)/nickel-doped iron oxyhydroxide (Ni:FeOOH, shell)/silicon nanowires (SiNWs, core) as a new multifunctional photocatalyst degradation common pollutants like polystyrene methylene blue through enhancing hydroxyl...
Magnesium diboride (MgB2) has been explored as an alternative fuel to boron (B) due its high energy density and the additive effect of magnesium (Mg) promote B combustion. However, primary oxidation MgB2 does not occur unless it decomposes at a temperature (830 °C), which makes ignition difficult reaction slow. Recently, two-dimensional (2D) exfoliated nanosheets have attracted increasing attention their unique properties potential applications in various fields. In this study, we...
A nanodome structured BiVO 4 /GaO x N 1− (BVO/GaON) bilayer photoanode that is prepared by a facile solution method, and exhibits an improved photoelectrochemical water‐oxidation performance reported. GaON porous nanospheres with average size of ≈300 nm are first synthesized nitridation (NH 3 flow, 800 °C) Ga (OH) 10 SO nanospheres. The coated slurry coating then the BVO layer uniformly deposited sol–gel spin‐coating method to form structure. Band alignment, light absorption, relative...