A5052683595- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Supercapacitor Materials and Fabrication
- Advanced Battery Technologies Research
- Organic Electronics and Photovoltaics
- Extraction and Separation Processes
- Conducting polymers and applications
- Various Chemistry Research Topics
- Chemistry and Chemical Engineering
- Electrochemical sensors and biosensors
- Polymer crystallization and properties
- Ionic liquids properties and applications
- Organic Light-Emitting Diodes Research
- CO2 Reduction Techniques and Catalysts
- Food Allergy and Anaphylaxis Research
- Meat and Animal Product Quality
- Microbial Inactivation Methods
- Carbon dioxide utilization in catalysis
- Molecular Sensors and Ion Detection
University of Colorado Boulder
2020-2025
University of Colorado System
2022-2023
Abstract A systematic study of the polymorphs emerging in P(NDI2OD‐T2) (also commercially known as N2200), a prototypical organic semiconducting n‐type polymer, is presented. Using tightly integrated experimental and computational approach, detailed atomistic‐level descriptions are provided investigating three observed at room temperature function thin‐film processing. Importantly, over course work, missing link uncovered, fourth polymorph referred to here Form I‐𝜷 ; this new form...
Abstract Understanding the formation and evolution of cathode‐electrolyte interphase (CEI), which forms at interface between cathode electrolyte, is crucial for revealing degradation mechanisms in materials, especially developing strategies to stabilize strongly oxidizing conditions that evolve high operating voltages next‐generation Li‐ion batteries. However, The present understanding CEI challenged by its complex dynamic nature. In this work, near‐edge X‐ray absorption fine structure...
Ferrocyanides and ferricyanides are among the most employed positive electrolyte materials in aqueous flow battery research, but limited solubility of commonly available sodium potassium salts is a critical factor limiting application at scale. Here, we systematically study cation-dependent these and, importantly, stability anion solution. For Li4Fe(CN)6, report maximum 2.3 M show stable cycling 2 symmetric cell, corresponding to capacities 54 Ah L−1, over 200 days. We also demonstrate...
Aminopolycarboxylate chelates are emerging as a promising class of electrolyte materials for aqueous redox flow batteries, offering tunable potentials, solubility, and pH stability through careful selection ligands transition metal ions. Despite their potential, the impact molecular structure modifications on electronic electrochemical properties these remains underexplored. Here, we examine how introducing hydroxyl group, often employed its solubilizing properties, to backbone CrPDTA,...
This work studies the electrocatalytic disproportionation of CO2 into CO and CO32– mediated by a [Mn-2,6-bis(1-(alkyl)imidazol-2-ylidene)pyridine]Br pincer complex. We identify three mechanistic scenarios involving one or two catalytically active metal centers in activation carbon dioxide use density functional theory to map out energy landscape for each steps. Experimentally determined second-order kinetics consumption, formation together with an observed order catalyst 0.5 cyclic...
By tailoring the coordination sphere of vanadium to accommodate a 7-coordinate geometry, highly soluble (>1.3 M) and reducing (-1.2 V vs Ag/AgCl) flow battery electrolyte is generated from [V(DTPA)]2-/3- (DTPA = diethylenetriaminepentaacetate). Bulk spectroelectrochemistry performed in situ assess material properties both oxidized reduced states. Flow batteries are assembled near neutral pH conditions operated with discharge energy densities 12.5 Wh L-1 high efficiency. Further, first...
Delamination of the electron-transporting polymer N2200 from indium tin oxide (ITO) in aqueous electrolytes is mitigated by modifying ITO with an azide-functionalized phosphonic acid (PA) which, upon UV irradiation, reacts polymer. The optical, electrochemical, and spectroelectrochemical properties thin films are retained non-aqueous media.
Ferro- and ferricyanides are among the most employed positive electrolyte materials in aqueous flow battery research but limited solubility of commonly available sodium potassium salts is a critical factor limiting application at scale. We systematically study cation dependent these and, importantly, stability anion solution. For Li 4 Fe(CN) 6 we report maximum 2.3 M show stable cycling 2 symmetric cell (54 Ah L −1 ) over 200 days, also demonstrate solubilities 1.6 for ammonium calcium...
Highlighting the interdisciplinary nature of research, we present a series experiments for undergraduate lab courses that teach principles preparative ion exchange chromatography and flame emission spectroscopy. Through these inquiry-based experiments, students learn about experimental design instrument limitations, naturally connecting general chemistry with analytical physical materials science. The goal is to devise parameters allow quantitative on small scale, monitor optical...
Development of energy dense aqueous redox flow batteries is held back by high cost, chemical instability highly soluble active compounds, or solubility limits more suitable materials. Here, we study solubilizing effects inexpensive polar additives on metal-organic chelates based aminopolycarboxylate ligands, a particularly promising family compounds for application in negative electrolytes near neutral pH with demonstrated discharge voltages as 2.1 V. [1] Upon addition certain additives,...
Redox flow batteries have attracted attention for their potential large-scale energy storage, largely due to ability decouple power and energy. However, limited density is often cited as a major drawback preventing adoption at scale. Therefore, there interest in research into increasing the solubility of active material these electrolytes. One such method materials with multiple redox events. Promising are, however, poorly soluble, computational studies showed that differences between e.g.,...
Flow battery electrolyte containing chelated metal ions can support high voltage, power, and efficiency cycling in pH-neutral conditions. In this talk the coordination behavior flow performance of including vanadium, chromium, iron, cerium will be presented. Key to enabling approach is fundamental understanding properties chelating agent specific oxidation states. Techno-economic analyses suggest that advantages chelation more than offsets cost agents. Finally, strategies towards...
Electrolytes containing multiple redox couples are promising for improving the energy density of flow batteries. Here, two chelated chromium complexes that structural isomers characterized and combined to generate electrolytes up 2 M active species, corresponding 53.6 Ah L−1. The mixed isomer approach enables a significantly higher material content than individual materials would allow, affording dense cells with Coulombic efficiencies ≥99.6% at 100 mA cm−2 an open circuit voltage 1.65 V 50%...
Aqueous electrolytes offer significant advantages over their organic counterparts, particularly for large-scale applications that prioritize non-flammability, scalability, and sustainability. However, the narrow electrochemical stability window of water imposes voltage limitations, resulting in low energy densities aqueous batteries. Highly concentrated have enabled high-voltage, mostly intercalation-type, battery chemistries, past decade many additives, coatings, highly soluble salts been...
Aqueous redox flow batteries are generally adapted from polymer electrolyte membrane fuel cells that use proton exchange membranes to balance the charge of cell. Such well understood and exhibit excellent performance in acidic electrolytes via transport protons. For neutral pH however, primary cation solution is not H + , but active material or supporting salt. The nature solution, e.g., hydrated ionic radius density, significantly affects resistance through thus area specific cell, a...