A5049712479- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- Mesoporous Materials and Catalysis
- Supercapacitor Materials and Fabrication
- Electrochemical Analysis and Applications
- Zeolite Catalysis and Synthesis
- Advanced Photocatalysis Techniques
- Catalysis and Hydrodesulfurization Studies
- Catalysis and Oxidation Reactions
- CO2 Reduction Techniques and Catalysts
- Nanomaterials for catalytic reactions
- Polyoxometalates: Synthesis and Applications
- Advancements in Battery Materials
- Conducting polymers and applications
- Electrochemical sensors and biosensors
- Advanced Memory and Neural Computing
- Semiconductor materials and devices
- Advanced Battery Materials and Technologies
- MXene and MAX Phase Materials
- Covalent Organic Framework Applications
- Copper-based nanomaterials and applications
- Metal-Organic Frameworks: Synthesis and Applications
- Machine Learning in Materials Science
Seoul National University
2023-2025
National University College
2024
New Generation University College
2024
Ulsan National Institute of Science and Technology
2014-2023
Weatherford College
2023
Government of the Republic of Korea
2015-2021
ORCID
2021
Ulsan College
2015-2016
Catholic University of Daegu
2015
Inha University
2015
Ordered carbon molecular sieves exhibiting Bragg diffraction of X-ray lines have been synthesized for the first time, using mesoporous silica as template. Sucrose was converted to inside mesopores through a mild carbonization process sulfuric acid catalyst. The were obtained after removal framework an aqueous solution sodium hydroxide. diffraction, transmission electron microscopy, and pore size analysis showed that structure consisted three-dimensional regular array uniform 3 nm in...
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of New, Nanoporous Carbon with Hexagonally Ordered MesostructureShinae Jun, Sang Hoon Joo, Ryong Ryoo, Michal Kruk, Mietek Jaroniec, Zheng Liu, Tetsu Ohsuna, and Osamu TerasakiView Author Information Materials Chemistry Laboratory School Molecular Science-BK21 Korea Advanced Institute Science Technology Taejon, 305-701, Department Chemistry, Kent State University Kent, Ohio 44242 CREST, JST, Tohoku Sendai 980-8578, Japan for...
Ordered mesoporous carbons have recently been synthesized using ordered silica templates. The synthesis procedure involves infiltration of the pores template with appropriate carbon precursor, its carbonization, and subsequent removal. needs to exhibit three-dimensional pore structure in order be suitable for synthesis, otherwise disordered microporous is formed. MCM-48, SBA-1, SBA-15 silicas were successfully used synthesize cubic or hexagonal frameworks, narrow mesopore size distributions,...
Iron-nitrogen on carbon (Fe-N/C) catalysts have emerged as promising nonprecious metal (NPMCs) for oxygen reduction reaction (ORR) in energy conversion and storage devices. It has been widely suggested that an active site structure Fe-N/C contains Fe-Nx coordination. However, the preparation of high-performance mostly involves a high-temperature pyrolysis step, which generates not only catalytically sites, but also less large iron-based particles. Herein, we report general...
The development of two-dimensional (2D) high-performance electrode materials is the key to new advances in fields energy conversion and storage. MXenes, a intriguing family 2D transition metal carbides, nitrides, carbonitrides, have recently received considerable attention due their unique combination properties such as high electrical conductivity, hydrophilic nature, excellent thermal stability, large interlayer spacing, easily tunable structure, surface area. In this review, we discuss...
Carbon monoxide oxidation over ruthenium catalysts has shown an unusual catalytic behavior. Here we report a particle size effect on CO Ru nanoparticle (NP) catalysts. Uniform NPs with tunable from 2 to 6 nm were synthesized by polyol reduction of Ru(acac)3 precursor in the presence poly(vinylpyrrolidone) stabilizer. The measurement activity two-dimensional arrays under oxidizing reaction conditions (40 Torr and 100 O2) showed dependence NP size. increases size, catalyst shows 8-fold higher...
Nanostructured carbon materials doped with a variety of heteroatoms have shown promising electrocatalytic activity in the oxygen reduction reaction (ORR). However, understanding working principles that underpin superior ORR observed nanocarbons is still limited to predictions based on theoretical calculations. Herein, we demonstrate, for first time, enhanced can be correlated variation their nanoscale work function. A series ordered mesoporous carbons (OMCs) were prepared using N, S, and O...
The synthesis and application aspects of ordered mesoporous carbon (OMC) as a novel material for fuel cell catalysts are reviewed in this paper. structural characterization OMC is outlined the recent advances relevant to technologies presented. Recent examples support summarized practical approaches systems discussed. Future perspectives on use energy conversion storage devices also suggested.
The high cost of the platinum-based cathode catalysts for oxygen reduction reaction (ORR) has impeded widespread application polymer electrolyte fuel cells. We report on a new family non-precious metal based ordered mesoporous porphyrinic carbons (M-OMPC; M = Fe, Co, or FeCo) with surface areas and tunable pore structures, which were prepared by nanocasting silica templates metalloporphyrin precursors. FeCo-OMPC catalyst exhibited an excellent ORR activity in acidic medium, higher than other...
A highly efficient, metal-free carbon nanocatalyst is presented that possesses abundant active, oxygenated graphitic edge sites. The site-rich nanocarbon catalyst exhibits about 28 times higher activity for H2 O2 production than a basal plane-rich nanotube with selectivity over 90 %. oxidative treatment further promotes the generation to reach close thermodynamic limit. optimized shows very high activity, surpassing previously reported catalysts in alkaline media. Moreover, it can stably...
We report the use of noble metal-free ordered mesoporous Co3O4 spinels (meso-Co3O4), templated from KIT-6 silica, as highly active and stable bifunctional electrocatalysts for both oxygen evolution reduction reactions (OER ORR, respectively). The meso-Co3O4 nanostructures showed high activity OER in an alkaline medium (0.1 M KOH), which makes them comparable to most Ir/C catalyst better than nanoparticles (NPs) Pt/C catalyst. Furthermore, exhibited enhanced stability, compared NPs. stability...
Nanoframe electrocatalysts have attracted great interest due to their inherently high active surface area per a given mass. Although recent progress has enabled the preparation of single nanoframe structures with variety morphologies, more complex such as double-layered not yet been realized. Herein, we report rational synthetic strategy for structurally robust Ir-based multimetallic (DNF) structure, nanoframe@nanoframe. By leveraging differing kinetics dual Ir precursors and transition...
Nanoporous metal oxide materials are ubiquitous in the material sciences because of their numerous potential applications various areas, including adsorption, catalysis, energy conversion and storage, optoelectronics, drug delivery. While synthetic strategies for preparation siliceous nanoporous well-established, nonsiliceous oxide-based still present challenges. Herein, we report a novel strategy that exploits metal–organic framework (MOF)-driven, self-templated route toward oxides via...
Abstract Chlorine evolution reaction (CER) is a critical anode in chlor-alkali electrolysis. Although precious metal-based mixed metal oxides (MMOs) have been widely used as CER catalysts, they suffer from the concomitant generation of oxygen during CER. Herein, we demonstrate that atomically dispersed Pt−N 4 sites doped on carbon nanotube (Pt 1 /CNT) can catalyse with excellent activity and selectivity. The Pt /CNT catalyst shows superior to nanoparticle-based commercial Ru/Ir-based MMO...
Triple perovskite, Nd 1.5 Ba CoFeMnO 9−δ , enriched with oxygen defects shows high activity and durability as a bifunctional electrocatalyst.
Development of oxygen evolution reaction (OER) catalysts with reduced precious metal content while enhancing catalytic performance has been pivotal importance in cost‐effective design acid polymer electrolyte membrane water electrolyzers. Hollow multimetallic nanostructures well‐defined facets are ideally suited for saving the usage expensive metals as well boosting performances; however, Ir‐based hollow nanocatalysts have rarely reported. Here, a very simple synthetic scheme is reported...
Abstract A facile, scalable route to new nanocomposites that are based on carbon nanotubes/heteroatom‐doped (CNT/HDC) core–sheath nanostructures is reported. These were prepared by the adsorption of heteroatom‐containing ionic liquids walls CNTs, followed carbonization. The design CNT/HDC composite allows for combining electrical conductivity CNTs with catalytic activity HDC sheath layers. highly active electrocatalysts oxygen reduction reaction and displayed one best performances among...
Catalytic properties of nanoparticles can be significantly enhanced by controlling nanoscale alloying and its structure. In this work, using a facet-controlled Pt@Ni core–shell octahedron nanoparticle, we show that the phase segregation have directionality geometrically controlled to produce Ni is penetrated Pt atoms along three orthogonal Cartesian axes coated edges. This peculiar anisotropic diffusion core ⟨100⟩ vertex, then toward ⟨110⟩ edges, explained via minimum strain energy for Ni–Ni...
Abstract Noble metal binary alloy nanoframes have emerged as a new class of fuel cell electrocatalysts because their intrinsic high catalytic surface area and accompanied activity. However, inferior structural compositional stability during catalysis pose formidable huddles to practical applications. Herein, it is reported that introduction an additional component the system may serve simple effective means enhancing nanoframe‐based electrocatalysts. It demonstrated in situ doping Co PtCu...
Atomically dispersed precious metal catalysts have emerged as a frontier in catalysis. However, robust, generic synthetic strategy toward atomically is still lacking, which has limited systematic studies revealing their general catalytic trends distinct from those of conventional nanoparticle (NP)-based catalysts. Herein, we report catalysts, consists "trapping" precursors on heteroatom-doped carbonaceous layer coated carbon support and "immobilizing" them with SiO2 during thermal...