A5015897487- Fuel Cells and Related Materials
- Membrane-based Ion Separation Techniques
- Advanced battery technologies research
- Electrocatalysts for Energy Conversion
- X-ray Diffraction in Crystallography
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Battery Materials and Technologies
- Ionic liquids properties and applications
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Synthetic Organic Chemistry Methods
- Crystallization and Solubility Studies
Cornell University
2012-2020
A tetrakis(dialkylamino)phosphonium cation was evaluated as a functional group for alkaline anion exchange membranes (AAEMs). The base stability of [P(N(Me)Cy)(4)](+) directly compared to that [BnNMe(3)](+) in 1 M NaOD/CD(3)OD. high relative inspired the preparation AAEM materials composed phosphonium units attached polyethylene. AAEMs (hydroxide conductivity 22 ± mS cm(-1) at °C) were prepared using ring-opening metathesis polymerization, and their stabilities 15 KOH °C 80 °C.
Highly base-stable cationic moieties are a critical component of anion exchange membranes (AEMs) in alkaline fuel cells (AFCs); however, the commonly employed organic cations have limited stability. To address this problem, we synthesized and characterized stability series imidazolium 1, 2, or 5 M KOH/CD3OH at 80 °C, systematically evaluating impact substitution on chemical The substituent identity each position ring has dramatic effect overall cation We report that highest stabilities...
In order to prepare base-stable, mechanically strong, and synthetically feasible alkaline anion exchange membranes (AAEMs) for applications in fuel cells, an imidazolium-fused cyclooctene monomer was prepared subjected ring-opening metathesis polymerization (ROMP) conditions. Surprisingly, macrocyclic oligomers were obtained instead of high molecular weight polymers. High-performance AAEMs synthesized by using a bifunctional cross-link the macrocycles. The resultant showed ionic...
Understanding the degradation mechanisms of organic cations under basic conditions is extremely important for development durable alkaline energy conversion devices. Cations are key functional groups in anion exchange membranes (AAEMs), and AAEMs critical components to conduct hydroxide anions fuel cells. Previously, we have established a standard protocol evaluate cation stability within KOH/CD3OH solution at 80 °C. Herein, using compare 26 model compounds, including benzylammonium,...
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTProtocol for the Quantitative Assessment of Organic Cation Stability Polymer ElectrolytesKristina M. HugarKristina HugarDepartment Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, United StatesMore by Kristina Hugarhttp://orcid.org/0000-0003-1380-0747, Wei YouWei YouDepartment Youhttp://orcid.org/0000-0002-8698-309X, Geoffrey W. Coates*Geoffrey CoatesDepartment States*E-mail: [email protected]More...
A strategy has been devised to study the incorporation and exchange of anions in a candidate alkaline anion membrane (AAEM) material for fuel cells using electrochemical quartz crystal microbalance (EQCM) technique. It involves electro-oxidation methanol (CH3OH) under conditions generate carbonate (CO32–) formate (HCOO–) ions at electrode resonator coated with an AAEM film, while simultaneously monitoring changes frequency (Δf) motional resistance (ΔRm) resonator. decrease Δf, indicating...
Hydroxide-stable organic cations are crucial components for ion-transport processes in electrochemical energy systems, and the tetrakis(dialkylamino)phosphonium cation is a promising candidate this application. These phosphoniums known to be highly resistant alkaline media; however, very few investigations have systematically evaluated how these decompose presence of hydroxide or alkoxide anions. The excellent stability several tetraaminophosphoniums 2 M KOH/CH3OH at 80 °C led us design...