A5042285451- Ionic liquids properties and applications
- Crystallography and molecular interactions
- Supercapacitor Materials and Fabrication
- Semiconductor materials and devices
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Solid-state spectroscopy and crystallography
- Advanced Battery Materials and Technologies
- Chemical and Physical Properties in Aqueous Solutions
- Advancements in Battery Materials
- Conducting polymers and applications
- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- Electronic and Structural Properties of Oxides
- Electron and X-Ray Spectroscopy Techniques
- Advanced Sensor and Energy Harvesting Materials
- Electrostatics and Colloid Interactions
- Anodic Oxide Films and Nanostructures
- Semiconductor materials and interfaces
- Thermodynamic properties of mixtures
- Engineering and Material Science Research
- ZnO doping and properties
- Fuel Cells and Related Materials
- Electrostatic Discharge in Electronics
- Electrospun Nanofibers in Biomedical Applications
North Carolina State University
2013-2022
North Central State College
2018
Atomic layer deposition (ALD) is a viable means to add corrosion protection copper metal. Ultrathin films of Al2O3, TiO2, ZnO, HfO2, and ZrO2 were deposited on metal using ALD, their properties measured electrochemical impedance spectroscopy (EIS) linear sweep voltammetry (LSV). Analysis ∼50 nm thick each oxide demonstrated low porosity provided enhanced from aqueous NaCl solution. The surface pretreatment roughness was found affect the extent protection. Films Al2O3 or HfO2 highest level...
A Raman spectroscopic evaluation of numerous crystalline solvates with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI or LiN(SO2CF3)2) has been conducted over a wide temperature range. Four new solvate structures—(PHEN)3:LiTFSI, (2,9-DMPHEN)2:LiTFSI, (G3)1:LiTFSI and (2,6-DMPy)1/2:LiTFSI phenanthroline, 2,9-dimethyl[1,10]phenanthroline, triglyme, 2,6-dimethylpyridine, respectively—have determined to aid in this study. The data have correlated varying modes TFSI–···Li+ cation coordination...
Atomic layer deposition (ALD) of vanadium oxide is a viable means to add pseudocapacitive layers porous carbon electrodes. Two commercial activated materials with different surface areas and pore structures were acid treated coated by V2O5 ALD using triisopropoxide water at 150 °C. The process was characterized various temperatures confirm saturated growth conditions. Capacitance electrochemical impedance analysis subsequently constructed capacitors (ECs) showed improved charge storage for...
Molecular dynamics (MD) simulations of acetonitrile (AN) mixtures with LiBF4, LiCF3SO3 and LiCF3CO2 provide extensive details about the molecular- mesoscale-level solution interactions thus explanations as to why these electrolytes have very different thermal phase behavior electrochemical/physicochemical properties. The simulation results are in full accord a previous experimental study (AN)n-LiX electrolytes. This computational reveals how structure anions strongly influences ionic...
Kevlar, poly( p ‐phenylene terephthalamide) (PPTA), yarns are modified for use as flexible supercapacitor electrodes by coating them with a nanometer‐scale film of conductive platinum metal and pseudocapacitive V 2 O 5 using atomic layer deposition (ALD). The PPTA incorporated into solid‐state through the polyvinyl alcohol/lithium chloride gel electrolyte. Pseudocapacitive films 11 nm thick provide up to 5× increase in areal capacitance (18.4 mF cm −2 ) over Pt‐only‐coated PPTA. Thicker...
This work highlights the intrinsic capabilities and limitations of coating microporous materials using atomic layer deposition (ALD).
A Raman spectral evaluation of numerous crystalline solvates with lithium perchlorate (LiClO4) has been conducted over a wide temperature range. Two new solvate crystal structures─(PMDETA)1:LiClO4 and (THF)1:LiClO4 N,N,N′,N″,N″-pentamethyldiethylenetriamine tetrahydrofuran─have determined to aid in this study. With help density functional theory (DFT) molecular dynamics (MD) simulations, the spectroscopic data have correlated varying modes ClO4–···Li+ cation coordination within structures...
RF sources are used in many applications, including high-power radar, communications, cancer therapy and diagnosis, electronic countermeasures, high-energy accelerators. Many of these located well controlled environments where high-quality coolant fluids readily available. Others, however, on platforms harsh environmental conditions exist, coolants not easily provided. This includes ships at sea remote transmitters the second-world third-world countries. Corrosive ethylene glycol mixtures...
Electrolyte formulations are frequently perceived to be a linchpin for enabling the use of new battery electrode chemistries. The electrolyte serves as medium transport active ions and from electrodes undergo redox reactions, but molecular-level interactions which govern solvent-ion (solvation) ion-ion (ionic association) remain poorly understood. New characterization methods/tools, or improvements existing evaluation methods, needed obtain detailed information about such interactions...and...
The utilization of electrolytes for lithium batteries is linked with a significant body conventional wisdom about based largely upon assumptions—unfortunately, many these assumptions are inaccurate. misconstrual the analysis experimental data often leads to highly erroneous interpretations electrolyte interactions. resulting poor understanding molecular- and mesoscale-level solution structure restrictive tailoring new formulations advanced battery chemistries. This talk will discuss utility...
Electrochemical capacitors can deliver high power density and long cyclability, but it is necessary to increase their energy promote widespread use. 1,2 The charge storage capacity of supercapacitors be increased by adding a pseudocapacitance material create Faradaic layer. High surface area activated carbon electrodes give good performance, conformal layer could further improve storage. pseudocapacitive properties V 2 O 5 have been well studied has incorporated into /carbon nanotube...
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Abstract not Available.
The interface of electrode materials in contact with solid-state electrolytes is current interest for the development devices high energy density and good safety. In-situ transmission electron microscopy (TEM) storage allows detailed study structure-property relationships near solid interfaces during electrochemical charge discharge. Here, we will describe design an in-situ TEM platform to investigate relationship a model oxide, V 2 O 5 , state-of-the-art electrolyte Li 7 La 3 Zr 12 (LLZO)....
Research is continuing to develop nanometer-scale, ceramic coatings reduce or eliminate corrosion in cooling channels of RF sources and components. The separate the metal substrate from coolant, preventing erosion. This addressing issues remote mobile environments where high quality coolant fluids are not available. Previous research demonstrated effectiveness alumina hafnia nanoscale coatings. current investigating additional materials optimum thickness application processes. A prototype...
Calabazas Creek Research, Inc., in collaboration with N.C. State University, is developing a system to apply nanometer-scale, ceramic coatings inside liquid cooling circuits prevent corrosion and erosion <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> . The proj ect focused on addressing issues encountered Naval ships operating substandard coolants. Salts, oxygen, particles the coolant have caused catastrophic failure of RF sources...