A5055851063- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Electrochemical Analysis and Applications
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Advanced Photocatalysis Techniques
- Catalytic Processes in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- Advancements in Battery Materials
- Advanced Electron Microscopy Techniques and Applications
- Perovskite Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- Advancements in Solid Oxide Fuel Cells
- Corrosion Behavior and Inhibition
- Copper-based nanomaterials and applications
- Catalysis and Hydrodesulfurization Studies
- Nanomaterials for catalytic reactions
- Nanoporous metals and alloys
- Hybrid Renewable Energy Systems
- Metal-Organic Frameworks: Synthesis and Applications
- Membrane-based Ion Separation Techniques
- CO2 Reduction Techniques and Catalysts
- Machine Learning in Materials Science
Institute for Basic Science
2013-2025
Seoul National University
2012-2025
Korea Advanced Institute of Science and Technology
2022-2024
Kootenay Association for Science & Technology
2023
Gwangju Institute of Science and Technology
2020-2022
Argonne National Laboratory
2018-2022
Seoul Institute
2018
Government of the Republic of Korea
2015-2018
Demand on the practical synthetic approach to high performance electrocatalyst is rapidly increasing for fuel cell commercialization. Here we present a synthesis of highly durable and active intermetallic ordered face-centered tetragonal (fct)-PtFe nanoparticles (NPs) coated with "dual purpose" N-doped carbon shell. Ordered fct-PtFe NPs size only few nanometers are obtained by thermal annealing polydopamine-coated PtFe NPs, shell that in situ formed from dopamine coating could effectively...
A highly active and stable non-Pt electrocatalyst for hydrogen production has been pursued a long time as an inexpensive alternative to Pt-based catalysts. Herein, we report simple effective approach prepare high-performance iron phosphide (FeP) nanoparticle electrocatalysts using oxide nanoparticles precursor. single-step heating procedure of polydopamine-coated leads both carbonization polydopamine coating the carbon shell phosphidation FeP, simultaneously. Carbon-shell-coated FeP show low...
The effect of porous structures on the electrocatalytic activity N-doped carbon is studied by using electrochemical analysis techniques and result applied to synthesize highly active stable Fe-N-C catalyst for oxygen reduction reaction (ORR). We developed synthetic procedures prepare three types model catalysts that are designed systematic comparison structures. difference in their catalytic investigated relation surface area parameters. found macro- mesoporous contribute different stages...
Methanol is a promising fuel for direct methanol cells in portable devices. A deeper understanding of its electro-oxidation needed evaluating electrocatalytic performance and catalyst design. Here we provide an in-depth investigation the cyclic voltammetry (CV) electro-oxidation. The oxidation peak backward scan shown to be unrelated residual intermediate oxidation. origin second (If2) expected on Pt–Ox. Electrochemical impedance spectroscopy coupled with CV reveals hysteresis shift...
Edge-exposed MoS2 nano-assembled structures are designed for high hydrogen evolution reaction activity and long term stability. The number of sulfur edge sites spheres sheets is confirmed by Raman spectroscopy EXAFS analysis. By controlling the morphology with formation assembly small-size fragments MoS2, resulting assembled have electrocatalytic HER thermodynamic
Perovskite oxides are an important class of oxygen evolution reaction (OER) catalysts in alkaline media, despite the elusive nature their active sites. Here, we demonstrate that origin OER activity a La1–xSrxCoO3 model perovskite arises from thin surface layer Co hydr(oxy)oxide (CoOxHy) interacts with trace-level Fe species present electrolyte, creating dynamically stable Generation is consequence process driven by A-site dissolution and O-vacancy creation. In turn, this imparts 10-fold...
ConspectusElectrocatalysis is a key process for renewable energy conversion and fuel production in future systems. Various nanostructures have been investigated to optimize the electrocatalytic activity realize efficient use. However, long-term stability of electrocatalysts also crucial sustainable reliable operation devices. Nanocatalysts are degraded by various processes during electrocatalysis, which causes critical performance loss. Recent operando analyses revealed mechanisms...
Abstract Solvothermal processes are considered efficient approaches for the gram-scale production of graphene. Further modification graphene by chemical doping is an important approach to tailor its properties. In this work, we successfully synthesized sulfur-doped using a solvothermal method with dimethyl sulfoxide as precursor, which common laboratory reagent. Nitrogen-doped was produced demonstrate generality process. These heteroatom-doped materials exhibited high surface areas and...
Structure effects of NiS and Ni<sub>3</sub>S<sub>2</sub> nanoparticles were investigated for their electrocatalytic activity in the hydrogen evolution reaction both acid alkaline media.
Heteroatom‐doped porous carbon materials have attracted much attention because of their extensive application in energy conversion and storage devices. Because the performance fuel cells rate capability supercapacitors depend significantly on multiple factors, such as electrical conductivity transport ions reactants, designing these carbon‐based to optimize factors is vital. In order address issues, alveoli that possess a hollow cavity where oxygen exchange can occur are synthesized,...
CO poisoning of Pt catalysts is one the most critical problems that deteriorate electrocatalytic oxidation and reduction reactions taking place in fuel cells. In general, enhancing properties by tailoring electronic structure (electronic effect) or increasing amount supplied oxygen species (bifunctional effect), which typical reactant for oxidation, has been performed to remove from surface. However, though there have a few reports about understanding effect rapid separate bifunctional...
We propose a method to enhance the fuel cell efficiency with simultaneous removal of toxic heavy metal ions. Carbon monoxide (CO), an intermediate methanol oxidation that is primarily responsible for Pt catalyst deactivation, can be used as in-situ reducing agent hexavalent chromium (Cr (VI)) reactivating CO-poisoned catalyst. Using electro-oxidation measurements, adsorbed CO molecules coupled concurrent conversion Cr (VI) (III) was confirmed. This concept also successfully applied its...
Molybdenum disulfide (MoS<sub>2</sub>)-based hybrid nanostructures have attracted much attention as promising alternatives to Pt-based electrocatalysts for the hydrogen evolution reaction.
Abstract Nickel nitride electrodes were prepared by reactive sputtering of nickel under a N 2 atmosphere at room temperature for application in mesoscopic dye- or quantum dot- sensitized solar cells. This facile and reliable method led to the formation Ni film with cauliflower-like nanostructure tetrahedral crystal lattice. The exhibited an excellent chemical stability toward both iodide polysulfide redox electrolytes. Compared conventional Pt electrodes, showed inferior electrocatalytic...
Nitrogen-doped porous carbon materials have been highlighted as promising alternatives to high-cost platinum in various electrochemical energy applications. However, protocols generate effective pore structure are still challenging, which hampers mass production and utilization of materials. Here, we suggest a facile method for hierarchical by single-step carbonization coffee waste (CW) with ZnCl2. The CW, is one the most earth-abundant organic waste, can be successfully converted...
Abstract Demands for sustainable production of hydrogen are rapidly increasing because environmental considerations fossil fuel consumption and development cell technologies. Thus, the high‐performance economical catalysts has been extensively investigated. In this study, a nanoporous Mo carbide electrode is prepared using top‐down electrochemical process it applied as an electrocatalyst evolution reaction (HER). Anodic oxidation foil followed by heat treatment in carbon monoxide (CO)...
Abstract Given that a considerably large population suffers from shortage of water, there are numerous on‐going efforts to turn seawater into freshwater, and electrochemical desalination processes—particularly capacitive deionization (CDI)—have gained significant attention due their high energy efficiency reliable performance. Meanwhile, carbonaceous electrode materials, which most commonly used in CDI systems, have poor long‐term stability unfavorable interactions with oxygen saline water....