Two Electron Viologen Anolyte Materials for Neutral Aqueous Organic Redox Flow Batteries
Class
Article
College
College of Science
Faculty Mentor
Leo Liu
Presentation Type
Poster Presentation
Abstract
Organic redox flow batteries provide a compelling avenue to advance large-scale energy storage due the synthetic tunability and sustainability of organic active materials. Furthermore, aqueous systems lower the cost, toxicity, and flammability of the electrolyte solution compared to non-aqueous systems. Through rational molecular engineering, a family of two-electron storage viologen anolyte materials were synthesized with the goal of boosting the cell voltage and capacity of organic aqueous redox flow batteries. These viologen anolytes have a theoretical capacity up to 96.5 Ah/L in H2O, and reduction potentials as low as -0.78 V vs. NHE. In flow battery testing, these compounds showed outstanding two-electron cycling performance when paired with (ferrocenylmethyl)trimethylammonium chloride as a cathode: cell voltage up to 1.38 V, peak power density up to 130 mW/cm2, capacity retention up to 99.99% per cycle, and energy efficiency up to 65% at 60 mA/cm2. Pairing a two-electron viologen anolyte with a TEMPO catholyte in an aqueous flow battery as a proof-of-concept delivered two-electron cycling with a cell voltage up to 1.72 V. This represents the highest cell voltage reported for an organic aqueous redox flow battery.
Location
The South Atrium
Start Date
4-12-2018 10:30 AM
End Date
4-12-2018 11:45 AM
Two Electron Viologen Anolyte Materials for Neutral Aqueous Organic Redox Flow Batteries
The South Atrium
Organic redox flow batteries provide a compelling avenue to advance large-scale energy storage due the synthetic tunability and sustainability of organic active materials. Furthermore, aqueous systems lower the cost, toxicity, and flammability of the electrolyte solution compared to non-aqueous systems. Through rational molecular engineering, a family of two-electron storage viologen anolyte materials were synthesized with the goal of boosting the cell voltage and capacity of organic aqueous redox flow batteries. These viologen anolytes have a theoretical capacity up to 96.5 Ah/L in H2O, and reduction potentials as low as -0.78 V vs. NHE. In flow battery testing, these compounds showed outstanding two-electron cycling performance when paired with (ferrocenylmethyl)trimethylammonium chloride as a cathode: cell voltage up to 1.38 V, peak power density up to 130 mW/cm2, capacity retention up to 99.99% per cycle, and energy efficiency up to 65% at 60 mA/cm2. Pairing a two-electron viologen anolyte with a TEMPO catholyte in an aqueous flow battery as a proof-of-concept delivered two-electron cycling with a cell voltage up to 1.72 V. This represents the highest cell voltage reported for an organic aqueous redox flow battery.