A5032298186- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Battery Technologies Research
- Advancements in Battery Materials
- Electrochemical Analysis and Applications
- Advanced Battery Materials and Technologies
- Astrophysical Phenomena and Observations
- Phenothiazines and Benzothiazines Synthesis and Activities
- Gamma-ray bursts and supernovae
- Graphene research and applications
- Innovative Microfluidic and Catalytic Techniques Innovation
- Crystallography and molecular interactions
- Carbon Nanotubes in Composites
- Astronomy and Astrophysical Research
- Ionic liquids properties and applications
- Perovskite Materials and Applications
- Machine Learning in Materials Science
- Conducting polymers and applications
- Oxidative Organic Chemistry Reactions
- Fuel Cells and Related Materials
- CO2 Reduction Techniques and Catalysts
- Supercapacitor Materials and Fabrication
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
Energy Storage Systems (United States)
2022-2023
University of Kentucky
2014-2023
Argonne National Laboratory
2020-2022
University of Illinois Urbana-Champaign
2020
University of Vienna
2014
Florida International University
2011
Punjabi University
2008
Symmetric flow cell cycling of a soluble phenothiazine.
Simple modification of <italic>N</italic>-ethylphenothiazine (left) with electron-donating substituents (right) increases the molecular charge-storage capacity this donor.
Abstract A phenothiazine derivative with high solubility in carbonate solvents containing lithium salts showed extensive overcharge protection and, as a result, has been evaluated catholyte for non‐aqueous redox flow batteries. We report the testing of 3,7‐bis(trifluoromethyl)‐ N ‐ethylphenothiazine and 2,3,6‐trimethylquinoxaline anolyte batteries 0.05, 0.15, 0.35 M active material found longest capacity retention over about 60 cycles at 0.15 . To our knowledge, this is most soluble...
Loosely aggregated conjugated polymer nanoparticles (CPNs) were used as nontoxic and efficient small interfering RNA (siRNA) delivery vehicles with visualization. A significant down regulation (94%) of a target gene was achieved by transfection HeLa cells the CPNs/siRNA complexes, supporting CPN promising siRNA carrier.
X-ray crystal structures of a phenothiazine posolyte and viologen negolyte cyclic voltammograms solution containing both compounds.
3,7-Disubstituted N-ethylphenothiazine derivatives were synthesized as redox shuttle candidates for lithium-ion batteries. Battery cycling results show that three prevent overcharge.
The stability and reactivity of the multiple oxidation states aromatic compounds are critical to performance these species as additives electrolytes in energy-storage applications. Both for overcharge mitigation ion-intercalation batteries electroactive redox flow batteries, neutral, radical-cation, radical-anion may be present during charging discharging processes. Despite wide range evaluated both applications, progress identifying stable materials has been slow, limited perhaps by overall...
Constant overcharging of LiFePO<sub>4</sub>/synthetic graphite lithium-ion batteries in which the electrolyte additives 1,4-di-<italic>tert</italic>-butyl-2,5-dimethoxybenzene (DBB), <italic>N</italic>-ethylphenothiazine (EPT), and 3,7-bis(trifluoromethyl)-<italic>N</italic>-ethylphenothiazine (BCF3EPT) limit battery voltage.
Organic radical cations are important intermediates in a wide variety of chemical processes. To date, significant progress has been made to improve the stability these charged materials for use electrochemical energy storage applications, especially redox flow batteries. Here, we report synthesis and isolation four cation salts N-(2-(2-methoxyethoxy)ethyl)phenothiazine (MEEPT), synthesizing MEEPT-X where X is tetrafluoroborate (BF4–), hexafluorophosphate (PF6–), perchlorate (ClO4–),...
Nonaqueous redox flow batteries are a promising technology for grid-scale energy storage, however, their success relies on identifying redox-active materials that exhibit extreme potentials, high solubilities , and long cycling stabilities.
Overcharge, a condition in which cell voltage rises to undesirably high potentials, can be prevented lithium-ion batteries by incorporating redox shuttles into the battery electrolyte. Although extensive overcharge protection has been demonstrated with LiFePO4 cathodes, that work these are incompatible higher cathodes. Designing stable additives oxidation potentials is necessary protect from overcharge. Toward goal, we synthesized diarylamines varied structures, including fused...
We highlight the status of, and propose future approaches for, rheological, electrochemical, spectroscopic characterization of concentrated redoxmer electrolytes for energy storage, with an emphasis on nonaqueous redox flow batteries.
Extensive overcharge protection via redox shuttling in lithium-ion batteries has been limited by the solubility of stable electrolyte additives. Only a few compounds dissolve at concentrations above 0.1 M carbonate-based electrolytes. Here we report performance highly soluble shuttle 3,7-bis(trifluoromethyl)-N-ethylphenothiazine as high 1.0 M. The compound enables for hundreds hours rates 1C, and even M, normal battery function is not affected presence low charging rates. results on these...
A new fluorinated phenothiazine derivative mitigates excess current in an overcharging lithium-ion cell containing a high-voltage cathode by shuttling it across the electrolyte <italic>via</italic> redox reactions at electrode/electrolyte interfaces.
When building energy dense redox flow batteries, the cell voltage of is critical. However, stability charged forms redox-active species often suffers at extreme potentials due to either self-discharge in electrolyte solutions or molecular degradation, presenting a challenge for achieving high voltages. In this work, we explore chemical and cycling series organic posolytes with 0.8 V vs Cp2Fe0/+ range oxidation nonaqueous systems. The relationship between coulombic efficiency during...
Increasing redox-active species concentrations can improve viability for organic redox flow batteries by enabling higher energy densities, but the required concentrated solutions become viscous and less conductive, leading to inefficient electrochemical cycling low material utilization at current densities. To better understand these tradeoffs in a model system, we study highly soluble stable couple, N-(2-(2-methoxyethoxy)ethyl)phenothiazine (MEEPT), its bis(trifluoromethanesulfonyl)imide...
ExpFlow, a software that allows the systematic encoding of laboratory workflows through graphical user interface, facilitates translation human-developed procedures to robotic experimentation.
Typical measurements of parasitic heat flow in lithium-ion cells can determine the magnitude but cannot differentiate between different types reactions. This causes difficulty when comparing that contain coatings and solvent systems, which may affect reaction pathways. In this work, a new technique to measure rate net enthalpy change (ΔH) reactions lithium ion is introduced. Isothermal microcalorimetry precision current are used make in-situ, non-destructive during high-voltage holds. The...
Lichens are resilient organisms, known for their unique profiles of secondary metabolites and exhibiting antioxidative, antibacterial, cytotoxic effects. Analyzing the potential Lobaria scrobiculata, a bioassay-guided fractionation strategy yielded seven metabolites, with two these compounds, 2 3, cytotoxicity against HL-60 cells. In order to verify impact degradation on observed bioactivity, purity stability evaluation was conducted. The consistency results obtained by water-soluble...
Integrated computational and experimental studies of concentrated redoxmer/electrolyte solutions reveal that charging leads to softening the solution.