A5100318791- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced battery technologies research
- Membrane-based Ion Separation Techniques
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Advancements in Solid Oxide Fuel Cells
- Hybrid Renewable Energy Systems
- Advanced Battery Technologies Research
- Crystallography and molecular interactions
- Gold and Silver Nanoparticles Synthesis and Applications
- Membrane Separation and Gas Transport
- Advanced Sensor and Energy Harvesting Materials
- Thin-Film Transistor Technologies
- Synthesis and properties of polymers
- Chemical Synthesis and Reactions
- Synthetic Organic Chemistry Methods
- Organic Light-Emitting Diodes Research
- Chemical Synthesis and Analysis
- CO2 Reduction Techniques and Catalysts
- Asymmetric Synthesis and Catalysis
- Catalytic Processes in Materials Science
- Electrospun Nanofibers in Biomedical Applications
Korea Institute of Science and Technology
2016-2025
Korea University
2018-2024
Hanyang University
2012-2023
Sungkyunkwan University
2017-2023
Myongji Hospital
2023
Los Alamos National Laboratory
2021-2022
Korea Advanced Institute of Science and Technology
2009-2021
Anyang University
2021
Stanford University
2020
Government of the Republic of Korea
2014-2019
Poly(fluorenyl- co -aryl piperidinium)-based AEMWEs reach outstanding current density values of 7.68 A cm −2 at 2.0 V with a cell durability 1000 h.
Anion exchange membrane fuel cells (AEMFCs) and water electrolysis (AEMWE) show great application potential in the field of hydrogen energy conversion technology. However, scalable anion membranes (AEMs) with desirable properties are still lacking, which greatly hampers commercialization this Herein, we propose a series novel multiblock AEMs based on ether-free poly(biphenyl ammonium-b-biphenyl phenyl)s (PBPA-b-BPPs) that suitable for use high performance AEMFC AEMWE systems because their...
Abstract Alkaline polymer electrolytes (APEs) are essential materials for alkaline energy conversion devices such as anion exchange membrane fuel cells (AEMFCs) and water electrolyzers (AEMWEs). Here, we report a series of branched poly(aryl‐co‐aryl piperidinium) with different branching agents (triptycene: highly‐rigid, three‐dimensional structure; triphenylbenzene: planar, two‐dimensional structure) high‐performance APEs. Among them, triptycene APEs showed excellent hydroxide conductivity...
A new bisphenol monomer, 9,9-bis(3,5-dimethoxy-4-hydroxyphenyl) fluorene, was synthesized and polymerized to form fluorene-based poly(arylene ether sulfone) copolymers containing tetra-methoxy groups (MPAES). After converting the methoxy group reactive hydroxyl group, respective side-chain type sulfonated (SPAES) were obtained by sulfobutylation. The polymers characterized 1H NMR, thermogravimetric analysis (TGA), water uptake, proton methanol transport for fuel cell applications. These...
Combed to perfection: Fully aromatic comb-shaped copolymers based on a poly(arylene ether sulfone) (PAES) backbone with highly sulfonated (SA) poly(phenylene oxide) (PPO) graft chains have nanochannel morphology (see picture) for efficient proton transport. These molecular structures show dramatic enhancement in conductivity under partially hydrated conditions compared typical hydrocarbon polymer electrolytes. Detailed facts of importance specialist readers are published as "Supporting...
Abstract A PVA nanofibrous matrix was prepared by electrospinning an aqueous 10 wt % solution. The mean diameter of the nanofibers electrospun from solution 240 nm. water resistance as‐spun improved physically crosslinking heat treatment at 150°C for min, which were found to be optimal conditions determined chemical and morphological considerations. In addition, heat‐treated (H‐PVA) coated with a chitosan construct biomimetic wound dressings. chitosan‐coated (C‐PVA) showed less hydrophilic...
Highly proton-conducting polymer electrolyte membrane (PEMs) materials are presented as alternatives to state-of-the-art perfluorinated polymers such Nafion®. To achieve stable PEMs with efficient ionic nanochannels, novel fully aromatic ABA triblock copolymers (SP3O-b-PAES-b-SP3O) based on sulfonated poly(2,6-diphenyl-1,4-phenylene oxide)s (A, SP3O) and poly(arylene ether sulfone)s (B, PAES) were synthesized. This molecular design for a PEM was implemented promote the nanophase separation...
Single-molecule surface-enhanced Raman spectroscopy (SERS) offers new opportunities for exploring the complex chemical and biological processes that cannot be easily probed using ensemble techniques. However, ability to place single molecule of interest reliably within a hot spot, enable its analysis at single-molecule level, remains challenging. Here we describe novel strategy locating securing target analyte in SERS spot plasmonic nanojunction. The "smart" was generated by employing...
Sulfonated poly(arylene sulfide sulfone nitrile)s (SN) were synthesized to investigate the effects of naphthalene units in polymer backbone on membrane properties. The small and planar main chain reduced interdomain distance, as confirmed by molecular simulations small-angle X-ray scattering patterns. SN membranes exhibited excellent chemical mechanical properties, better than those their phenylene counterpart (SP). In particular, water uptake swelling ratio much lower SP membranes....
The optimization of the localized surface plasmon resonance (LSPR)-decaying channels hot-electrons is essential for efficient optical and photochemical processes. Understanding having ability to control chemical interface damping (CID) channel contributions will bring about new possibilities tuning efficiency plasmonic hot-electron energy transfer in artificial devices. In this scanning electron microscopy-correlated dark-field scattering study, CID was controlled by focusing on electronic...
We report semi-interpenetrating polymer network (semi-IPN) membranes prepared easily from a cross-linked using poly(acrylic acid) (PAA) and poly(vinyl alcohol) (PVA) with interpenetrated Nafion for both proton-exchange membrane fuel cell (PEMFC) water electrolyzer (PEMWE) applications. Thermal esterification between PAA PVA induced three-dimensional cross-linking to improve mechanical toughness reduce hydrogen crossover, while the hydrophilic nature of PAA–PVA-based matrix still enhanced...
Abstract Alkaline polymer electrolytes (APEs) are essential materials for alkaline energy conversion devices such as anion exchange membrane fuel cells (AEMFCs) and water electrolyzers (AEMWEs). Here, we report a series of branched poly(aryl‐co‐aryl piperidinium) with different branching agents (triptycene: highly‐rigid, three‐dimensional structure; triphenylbenzene: planar, two‐dimensional structure) high‐performance APEs. Among them, triptycene APEs showed excellent hydroxide conductivity...
Segmented copoly(arylene ether sulfone) membranes having densely sulfonated pendent phenyl blocks were synthesized by the coupling reaction of phenoxide-terminated oligomers with bis(4-hydroxyphenyl) sulfone and decafluorobiphenyl (DFBP), followed postpolymerization sulfonation containing substituents. The was conducted at relatively low temperature utilizing highly reactive DFBP to prevent any possible trans-etherification that would randomize hydrophilic–hydrophobic sequences. copolymer...
We present a new approach of morphological transformation for effective proton transport within ionomers, even at partially hydrated states. Highly sulfonated poly(phenylene sulfide nitrile) (XESPSN) random network copolymers were synthesized as alternatives to state-of-the-art perfluorinated polymers such Nafion®. A combination thermal annealing and cross-linking, which was conducted 250 °C by simple trimerisation ethynyl groups the chain termini, results in transformation. The resulting...