A5069487156- Advancements in Battery Materials
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Conducting polymers and applications
- Fuel Cells and Related Materials
- Advanced Sensor and Energy Harvesting Materials
- Advanced Battery Technologies Research
- Electrocatalysts for Energy Conversion
- Dielectric materials and actuators
- Advanced battery technologies research
- Electrochemical sensors and biosensors
- Synthesis and properties of polymers
- Molecular Junctions and Nanostructures
- Membrane-based Ion Separation Techniques
- Ferroelectric and Piezoelectric Materials
- Graphene and Nanomaterials Applications
- Ionic liquids properties and applications
- Electrochemical Analysis and Applications
- Bone health and treatments
- Graphene research and applications
- Analytical chemistry methods development
- Electrospun Nanofibers in Biomedical Applications
- Boron Compounds in Chemistry
- Silicone and Siloxane Chemistry
- Multiferroics and related materials
National Nanotechnology Center
2018-2024
National Science and Technology Development Agency
2018-2024
Sungkyunkwan University
2016-2019
Pennsylvania State University
2010-2017
Park University
2017
King Mongkut's University of Technology Thonburi
2006
The ever‐increasing demand for compact electronics and electrical power systems cannot be met with conventional dielectric materials limited energy densities. Numerous efforts have been made to improve the densities of dielectrics by incorporating ceramic additives into polymer matrix. In spite increased permittivities, thus‐fabricated nanocomposites typically suffer from significantly decreased breakdown strengths, which preclude a substantial gain in density. Herein, organic–inorganic...
Polymeric binder is extremely important for Si-based anode in lithium-ion batteries due to large volume variation during charging/discharging process. Here, natural rubber-incorporated chitosan networks were designed as a material obtain both adhesion and elasticity. Chitosan could strongly anchor Si particles through hydrogen bonding, while the rubber stretch reversibly of particles, resulting high cyclic performance. The prepared electrode exhibited specific capacities 1350 mAh/g after...
Single-ion conducting electrolytes present a unique alternative to traditional binary salt conductors used in lithium-ion batteries. It has been shown theoretically that single-ion can eliminate the concentration gradient and polarization loss cell develop system, resulting substantial improvements materials utilization for high power energy densities. Here, we describe synthesis characterization of class based on aromatic poly(arylene ether)s with pendant lithium perfluoroethyl sulfonates....
Multiferroic laminate composites consisting of chain-end cross-linked ferroelectric polymers and magnetostrictive Metglas are reported. The exhibit a greatly enhanced multiferroic voltage coefficient sensitivity relative to analogous composites. These remarkable properties attributed high piezoelectric electromechanical coupling coefficients, because the formation larger crystalline sizes concurrent improvement in polarization ordering polymers.
Ionic liquid-based solid electrolytes with outstanding room-temperature ionic conductivity and excellent electrochemical stability are developed for all-solid-state Li metal batteries.
In this research, natural rubber (NR)-TiO2 nanocomposites were developed for triboelectric nanogenerator (TENG) application to harvest mechanical energy into electrical energy. Rutile TiO2 nanoparticles used as fillers in NR material improve dielectric properties so enhance the conversion performance of composite TENG. The effect filler concentration on TENG NR-TiO2 composites was investigated. addition, ball-milling method employed reduce agglomeration order their dispersion film. It found...
An environmentally friendly triboelectric nanogenerator (TENG) is fabricated from a natural rubber (NR)-Ag nanocomposite for harvesting mechanical energy human motions. Ag nanoparticles (AgNPs) synthesized with two different capping agents are added to NR polymer improving dielectric constant that contributes the enhancement of TENG performance. Dielectric modulated via interfacial polarization between AgNPs and matrix. The effects AgNP concentration, particle size dispersion in composite,...
Density functional calculations were performed on 15 functionalized graphene models to investigate the enhancement of quantum capacitance (CQ) by common dopant elements N, P, S, and O from biomaterials. Geometry optimizations formation energy demonstrated that van der Waals radius additional covalent bonds influenced mechanical stress energy, particularly due distortion lattice caused larger S or P atoms replacing carbon atoms. According both CQ calculations, nitrogen emerged as most...
The energy conversion performance of the triboelectric nanogenerator (TENG) is a function charges which depend on intrinsic properties materials to hold or dielectric materials. In this work, Ag nanoparticles were synthesized and used incorporate into natural rubber (NR) in order enhance constant for enhancing electrical output TENG. It was found that size reduced with increasing CTAB concentration. Furthermore, surfactant helped dispersion metallic NR-insulating matrix, promoted interfacial...
Abstract The silicon (Si)/graphene composite has been touted as one of the most promising anode materials for lithium ion batteries. However, optimal fabrication method this remains a challenge. Here, we developed novel using supercritical carbon dioxide (scCO 2 ) to intercalate Si nanoparticles into graphene nanosheets. Silicon was modified with thin layer polyaniline, which assisted dispersion sheets by introducing π-π interaction. Using scCO , well-dispersed Si/graphene successfully...
In this study, thesequential production of levulinic acid (LA) and supercapacitor electrode materials from cassava rhizome (CR) was investigated through an integrated biorefinery process. The CR pretreated in KOH solution at 120 °C for 1 h before valorization to LA via a catalytic hydrothermal process 0.1–0.7 M HCl 150–200 1–3 h. maximum yield (19.62 wt %) obtained under experimental conditions 200 0.4 HCl. Thereafter, the hydrochar coproduct further converted into porous activated carbon...
Despite receiving high regard as potential energy storage devices, high-performance supercapacitors that can be produced from bio-renewable sources at low cost are still in need. In this work, a novel fabrication process for cassava-based was described which carbon dots (CDs) and activated (AC) were prepared cassava peel quasi-solid polymer electrolyte the first time starch (CS). A specific capacitance (Csp) of 138.2 F g–1 obtained AC electrode CS/H2SO4 electrolyte, much greater than 95.9...
A new class of ionic liquid-containing triblock copolymers have been prepared viaRAFT polymerization the imidazolium methacrylate monomer using a telechelic fluoropolymer as macro-chain transfer agent. It is found that anionic counterion has direct impact on thermal properties, conductivity and segmental dynamics polymers. The temperature dependence well described by Vogel-Tamman-Fulcher model, suggesting ion motion closely coupled to motion.
In this study, nitrogen-enriched activated carbon from silkworm pupae waste (P-AC) was successfully prepared and its electrochemical performances in aqueous organic electrolytes were investigated. Silkworm is beneficial because it a nitrogen-enriched, inexpensive, locally available material. The preparation process includes hydrothermal treatment of the at 200 °C, chemical activation using zinc chloride temperatures 700, 800 900 °C (P700, P800, P900, respectively). nitrogen content P-ACs...
Abstract A proton‐exchange membrane for a direct methanol fuel cell was prepared by modifying the chemical structure of poly(vinyl alcohol) (PVA) via sulfonation. The sulfonation carried out using sulfophthalic acid (sPTA) as sulfonating agent. sulfonated PVA membranes, with variety degrees substitutions, were obtained varying crosslinking time and amount agents. thermal stability characterized FTIR thermogravimetric analysis techniques, respectively. ion‐exchange capacity (IEC) water uptake...
Gel polymer electrolyte (GPE) membrane was prepared by the facile amine-epoxy crosslinking reaction of poly(ethylene glycol)diglycidylether (PEGDE) with diamino-poly(propylene oxide) (DPPO) and subsequent immersion in 1 M LiPF6 solution. To apply GPE for Si anode a Li-ion battery, physical properties were optimized degree which controlled molecular weight each part. The crosslinked composed PEGDE(1,000 g mol−1) DPPO (4,000 exhibited desirable dimensional stability, low electrical resistance,...