Title of Oral/Poster Presentation

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

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Apr 12th, 10:30 AM Apr 12th, 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.