A5001444898- Organic Light-Emitting Diodes Research
- Advanced battery technologies research
- Lubricants and Their Additives
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Tribology and Wear Analysis
- Advancements in Battery Materials
- Fuel Cells and Related Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Electrocatalysts for Energy Conversion
- Ionic liquids properties and applications
- Advanced Combustion Engine Technologies
- Biodiesel Production and Applications
- Concrete and Cement Materials Research
- Microbial Applications in Construction Materials
- biodegradable polymer synthesis and properties
- Dendrimers and Hyperbranched Polymers
- Recycling and Waste Management Techniques
- Green IT and Sustainability
- Polymer crystallization and properties
- Synthesis and properties of polymers
- Luminescence and Fluorescent Materials
- Thin-Film Transistor Technologies
- Modeling, Simulation, and Optimization
Pacific Northwest National Laboratory
2013-2022
Battelle
2011-2022
Richland College
2016-2021
Carestream (United States)
2006
Kodak (United States)
2004-2005
Disordered nanocomposites comprised of polyethylene oxide and exfoliated MoS2 are cycled in the voltage range 0.01−3.0 V. The showed a significant increase reversible capacity cycle stability when compared to or bulk may be used as anode material lithium ion batteries.
A TEMPO-based non-aqueous electrolyte with the TEMPO concentration as high 2.0 m is demonstrated a high-energy-density catholyte for redox flow battery applications. With hybrid anode, Li|TEMPO cells using this deliver an energy efficiency of ca. 70% and impressively density 126 W h L(-1) .
Abstract Nonaqueous redox flow batteries hold the promise of achieving higher energy density because broader voltage window than aqueous systems, but their current performance is limited by low material concentration, cell efficiency, cycling stability, and density. We report a new nonaqueous all‐organic battery based on high concentrations materials, which shows significant, comprehensive improvement in performance. A mechanistic electron spin resonance study reveals that choice supporting...
A nonaqueous, hybrid metal-organic redox flow battery based on tailored anthraquinone structure is demonstrated to have an energy efficiency of ~82% and a specific discharge density similar those aqueous batteries, which due the significantly improved solubility in supporting electrolytes.
The effects of lithium salts on the performance Li–O2 batteries and stability salt anions in O2 atmosphere during discharge/charge processes were systematically investigated by studying seven common tetraglyme as electrolytes for batteries. discharge products reactions analyzed X-ray diffraction, photoelectron spectroscopy, nuclear magnetic resonance spectroscopy. was strongly affected used electrolyte. Lithium tetrafluoroborate (LiBF4) bis(oxalato)borate (LiBOB) decomposed formed LiF...
Nonaqueous redox flow batteries are emerging flow‐based energy storage technologies that have the potential for higher densities than their aqueous counterparts because of wider voltage windows. However, performance has lagged far behind inherent capability due to one major limitation low solubility species. Here, a molecular structure engineering strategy towards high nonaqueous electrolyte is reported with significantly increased solubility. Its outweighs state‐of‐the‐art batteries. In...
We report high efficiency and low roll-off for blue electrophosphorescent organic light emitting devices based on a mixed host layer architecture. The were fabricated using of di-[4-(N,N-ditolyl-amino)-phenyl]cyclohexane, hole transport material, 2,8-bis(diphenylphosphoryl)dibenzothiophene, an electron as the doped with phosphor iridium (III) bis[(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate. Using allowed us to achieve power (59 lm/W at 100 cd/m2), turn-on voltage (2.7 V >10 in...
Abstract We report a series of ionically modified ferrocene compounds for hybrid lithium-organic non-aqueous redox flow batteries, based on the ferrocene/ferrocenium couple as active catholyte material. Tetraalkylammonium ionic moieties were incorporated into structure, in order to enhance solubility otherwise relatively insoluble ferrocene. The effect various counter anions tetraalkylammonium ionized species appended ferrocene, such bis(trifluoromethanesulfonyl)imide, hexafluorophosphate,...
A chemical recycling approach of mixed PET was demonstrated here that provides a mechanism by which waste can be efficiently recovered and repurposed to value-added products. The utilizes aminolysis with variety amine nucleophiles, generating small library terephthalic amides distinct structures, such as polar, nonpolar, lipophilic. In order probe the value these products, were added road-grade asphalt binder at 5 wt %, fresh resulting composite evaluated. Specifically, rutting fatigue...
Abstract Conventional carbon fiber reinforced thermosetting polymers (CFRPs) are neither recyclable nor repairable due to their crosslinked network. The rapid growing CFRP market raises a serious concern of the waste management. In this work, viable method develop readily based on epoxy vitrimer is introduced. First, self‐catalytic prepolymer with built‐in hydroxy and tertiary amine groups designed, which upon reaction an anhydride formed catalyst‐free vitrimer. synthesized from diamine...
In this study, we report, for the first time, basic depolymerization of mixed waste polyethylene terephthalate (PET) by hydrolysis and subsequent terephthalic acid monomer recovery with high purity using benign reaction conditions. Several conditions were tested such as PET chip size, concentration aqueous sodium hydroxide (20 or 30%), organic co-solvent (ethylene glycol ethanol), temperature at which was run, duration heating. More importantly, several grades utilized starting materials...
Global carbon dioxide (CO2) emission is expected to increase tremendously with the shift coal-powered plants for energy generation. Capture and sequestration of CO2 are needed mitigate environmental effects. Solvents currently used this energy-intensive aqueous amines. Here we present 10 advanced solvents called alkanolguanidines alkanolamidines that potentially energy-efficient CO2-capture solvents. These were synthesized in 1–3 steps from commercially available materials. One...
Here we report the design and characterization of injectable thermosensitive hydrogel composites comprised poly(lactic acid-co-glycolic acid)-g-poly(ethylene glycol)(PLGA-g-PEG) containing hydroxyapatite (HA) for potential application in bone tissue engineering. Inclusion HA into hydrogels would provide both enhanced mechanical properties bioactivity to composites. The effects on were investigated terms storage modulus, sol-gel transition properties, pH vitro dye release behavior. also...
Abstract Nonaqueous redox flow batteries hold the promise of achieving higher energy density because broader voltage window than aqueous systems, but their current performance is limited by low material concentration, cell efficiency, cycling stability, and density. We report a new nonaqueous all‐organic battery based on high concentrations materials, which shows significant, comprehensive improvement in performance. A mechanistic electron spin resonance study reveals that choice supporting...
We report new injectable and thermosensitive hydrogels from polycaprolactone-graft-polyethylene glycol (PCL-g-PEG). The PCL-g-PEG polymer aqueous solution was formed a physical hydrogel at human body temperature. rheological properties, sol-gel transition mechanisms, in vitro degradation properties of were investigated. Rheological results demonstrate that with tunable storage moduli (G') span four orders magnitude, 0.2 to 5500 Pa, can be obtained by varying concentrations. Hydrophobic dye...
An organic radical based composite cathode comprised of poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl methacrylate) (PTMA)–Ketjenblack was developed by a simple solvent-less electrode fabrication method. The demonstrated two-electron redox reaction PTMA that is from an aminoxy anion (n-type) via to oxoammonium cation (p-type) with the corresponding potential at 2.8–3.1 V and 3.5–3.7 vs. Li/Li+ when evaluated in lithium half cells. Moreover, PTMA–Ketjenblack exhibits fast kinetics enhanced...
We report the design, synthesis, thermal, and photophysical properties of two phosphine oxide based electron transport/hole blocking materials, 2,6-bis(4-(diphenylphosphoryl)phenyl)pyridine (BM-A11) 2,4-bis(4-(diphenyl-phosphoryl)phenyl)pyridine (BM-A10), for blue electrophosphorescent organic light emitting devices (OLEDs). The use these materials in OLEDs with iridium(III) bis[(4,6-difluorophenyl)-pyridinato-N,C2′]picolinate (Firpic) as phosphor was demonstrated. Using dual host device...
Abstract We report novel polymeric materials that may be used as viscosity index improvers (VII) for lubricant applications. Our efforts included probing the comb-burst hyper-branched aryl polyester architecture beneficial and friction behavior when utilized an additive in a group I oil. The monomer was designed to undergo polymerization via polycondensation within architectural construct (AB 2 ), typical of hyperbranched polymers. design comprised aliphatic arms (12 or 16 methylenes)...
We studied the influence of a pyridine moiety versus phenyl when introduced in molecular design an ambipolar host. These pyridine-based host materials for organic light-emitting diodes (OLEDs) were synthesized three to five steps from commercially available starting materials. The isomeric hosts have similar HOMO/LUMO energies; however, data OLEDs fabricated using above demonstrate that small structural modification results significant changes its carrier-transporting characteristics.
Star-shaped poly(alkyl methacrylate)s (PAMAs) with a 3-arm architecture were designed, prepared and their performance as dual additive (viscosity index improver friction modifier) for engine oils was evaluated.