A5052161495- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Supercapacitor Materials and Fabrication
- Advanced battery technologies research
- Conducting polymers and applications
- Catalytic Processes in Materials Science
- Nanomaterials for catalytic reactions
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced Photocatalysis Techniques
- Advanced Battery Materials and Technologies
- Graphene research and applications
- Advanced Sensor and Energy Harvesting Materials
- Advancements in Battery Materials
- Advanced Nanomaterials in Catalysis
- TiO2 Photocatalysis and Solar Cells
- Covalent Organic Framework Applications
- Copper-based nanomaterials and applications
- Electrochemical Analysis and Applications
- Carbon Nanotubes in Composites
- Advanced Memory and Neural Computing
- Nanoparticle-Based Drug Delivery
- Fiber-reinforced polymer composites
- Dendrimers and Hyperbranched Polymers
- Electrochemical sensors and biosensors
- Nanoplatforms for cancer theranostics
Korea Institute of Materials Science
2020-2023
Ulsan National Institute of Science and Technology
2011-2016
Ulsan College
2016
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...
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 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...
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...
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...
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...
All-in-one hybrid composite fiber integrates ultrahigh energy storage performance and superior mechanical stability.
Metal sulfide-based nanostructured materials have emerged as promising catalysts for hydrogen evolution reaction (HER), and significant progress has been achieved in enhancing their activity durability the HER. The understanding of nanoscale size-dependent catalytic activities can suggest critical information regarding reactivity, providing scientific basis design advanced catalysts. However, size effects metal HER not yet established fully, due to synthetic difficulty precisely...
Developments of high-performance cost-effective electrocatalyts that can replace Pt catalysts have been a central theme in polymer electrolyte membrane fuel cells (PEMFCs) and direct methanol (DMFCs). In this direction, nitrogen-doped carbon nanostructures free metallic components attracted particular attention. Here we show directing graphitic nitride frameworks into mesoporous architecture generate highly promising metal-free electrocatalyst for an oxygen reduction reaction (ORR) acidic...
Selective targeting of tumor cells and release drug molecules inside the microenvironment can reduce adverse side effects traditional chemotherapeutics because lower dosages required. This be achieved by using stimuli‐responsive targeted delivery systems. In present work, a robust simple one‐pot route is developed to synthesize polymer‐gatekeeper mesoporous silica nanoparticles noncovalent capping pores drug‐loaded nanocontainers with disulfide cross‐linkable polymers. The method offers very...
Efficient and cost‐effective bifunctional electrocatalysts for oxygen evolution reaction (OER) reduction (ORR) are of vital importance in energy conversion storage devices. Despite the recent progress electrocatalysts, their unbalanced insufficient OER ORR activities has continued to pose challenges practical application such The design highly integrated, high‐performance, composed graphitic nanoshells embedded mesoporous carbon (GNS/MC) is reported. GNS/MC exhibits very high electrode...
We report the preparation of highly interconnected ordered mesoporous carbon–carbon nanotube nanocomposites which show Pt-like dye-sensitized solar cell (DSSC) efficiency and remarkable long-term durability as DSSC counter electrodes.
In this study, a range of carbon nanotube yarn (CNTY) architectures was examined and controlled by chemical modification to gain deeper understanding CNTY load-bearing systems produce lightweight superstrong CNTYs. The architecture CNTY, which has polymer layers surrounding compact bundle without hampering the original state CNTs in bundle, is favorable design for further cross-linking enhancing load-transfer efficiency, as confirmed situ Raman spectroscopy under stress load. resulting...
Ordered mesoporous carbon–carbon nanotube (OMC–CNT) nanocomposites were prepared and used as catalyst supports for polymer electrolyte fuel cells. The OMC–CNT composites synthesized via a nanocasting method that ordered silica template Ni–phthalocyanine carbon source. For comparison, sucrose phthalocyanine to generate two other OMCs, OMC(Suc) OMC(Pc), respectively. All three carbons exhibited hexagonally mesostructures uniform mesopores. Among the showed highest electrical conductivity,...
The π-π interaction-dependent vapour pressure of phenanthrenequinone can be used to synthesize a phenanthrenequinone-confined ordered mesoporous carbon. Intimate contact between the insulating and conductive carbon framework improves electrical conductivity. This enables more complete redox reaction take place. confinement in mitigates diffusion dissolved out cycling performance.
We report on a new class of hierarchical micro- and mesoporous materials, termed metallomacrocycle–graphene frameworks (MGFs), which can be constructed by covalently and/or coordinatively pillaring graphene oxide (GO) sheets with metallomacrocycles. This approach to fabricating 3D MGFs enables the alternative stacking GO Ni(II/III) metallomacrocycles in layer-by-layer manner, without phase separation structural entities. show that, depending preparation conditions, porosity could modulated...
The preparation of redox-active metal-organic framework (ra-MOF)-supported Pd nanoparticles (NPs) via the redox couple-driven method is reported, which can yield unprotected metallic NPs at room temperature within 10 min without use reducing agents. Pd@ra-MOF has been exploited as a precursor an active catalyst for CO oxidation. Under oxidation reaction condition, transformed into PdOx-NiOy/C nanocomposite to generate catalytically species in situ, and resultant nanocatalyst shows...
Despite significant advances in the development of flexible gel polymer electrolytes (GPEs), there are still problems to be addressed apply them electric double layer capacitors (EDLCs), including interfacial interactions between electrolyte and electrode under deformation. Previously reported EDLCs using GPEs have laminated structures with weak electrolyte, leading fragility upon elongation low power density due lower utilization surface area carbon material electrode. To overcome these...
The facile synthesis of silica supported platinum nanoparticles with ultrathin titania coating to enhance metal–support interactions suitable for high temperature reactions is reported, as thermal and structure stability metal important catalytic reactions.