Kinetic Properties of Aqueous Organic Redox Flow Battery Anolytes Using the Marcus–Hush Theory

Redox flow batteries (RFBs) represent a promising technology for grid-scale integration of renewable energy. Redox-active molecular pairs with large potential windows have been identified as key components of these systems. However, cross-contamination problems encountered by the use of different catholyte and anolyte species still limits the development of reliable organic RFBs. Herein, we report the first use of a helical carbenium ion, with three stable oxidation states, as electrolyte for the development of symmetric cells. Cyclic voltammo-amperometric studies were conducted in acetonitrile to assess the essential kinetic properties for flow battery performance and cycling stability of this molecule. The selected [4]helicenium ion was then evaluated by using mono- and bi-electronic cycling experiments, resulting in 745 and 80 cycles respectively, with near-perfect capacity retention. This helical carbenium ion based electrolyte achieved a proof-of-principle 2.12 V open circuit potential as an all-organic symmetric RFB.<br>

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Symmetric, Robust, and High-voltage Organic Redox Flow Battery Model Based on a Helical Carbenium Ion Electrolyte

10.26434/chemrxiv.12780725.v2 ◽

2020 ◽

Author(s):

Jules Moutet ◽

Jose M Veleta ◽

thomas Gianetti

Keyword(s):

Open Circuit Potential ◽

Open Circuit ◽

Kinetic Properties ◽

Redox Flow Battery ◽

Flow Battery ◽

Capacity Retention ◽

Battery Model ◽

Redox Active ◽

Carbenium Ion ◽

Scale Integration

Redox flow batteries (RFBs) represent a promising technology for grid-scale integration of renewable energy. Redox-active molecular pairs with large potential windows have been identified as key components of these systems. However, cross-contamination problems encountered by the use of different catholyte and anolyte species still limits the development of reliable organic RFBs. Herein, we report the first use of a helical carbenium ion, with three stable oxidation states, as electrolyte for the development of symmetric cells. Cyclic voltammo-amperometric studies were conducted in acetonitrile to assess the essential kinetic properties for flow battery performance and cycling stability of this molecule. The selected [4]helicenium ion was then evaluated by using mono- and bi-electronic cycling experiments, resulting in 745 and 80 cycles respectively, with near-perfect capacity retention. This helical carbenium ion based electrolyte achieved a proof-of-principle 2.12 V open circuit potential as an all-organic symmetric RFB.<br>

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Symmetric, Robust, and High-voltage Organic Redox Flow Battery Model Based on a Helical Carbenium Ion Electrolyte

10.26434/chemrxiv.12780725.v1 ◽

2020 ◽

Author(s):

Jules Moutet ◽

Jose M Veleta ◽

thomas Gianetti

Keyword(s):

Open Circuit Potential ◽

Open Circuit ◽

Kinetic Properties ◽

Redox Flow Battery ◽

Flow Battery ◽

Capacity Retention ◽

Battery Model ◽

Redox Active ◽

Carbenium Ion ◽

Scale Integration

Redox flow batteries (RFBs) represent a promising technology for grid-scale integration of renewable energy. Redox-active molecular pairs with large potential windows have been identified as key components of these systems. However, cross-contamination problems encountered by the use of different catholyte and anolyte species still limits the development of reliable organic RFBs. Herein, we report the first use of a helical carbenium ion, with three stable oxidation states, as electrolyte for the development of symmetric cells. Cyclic voltammo-amperometric studies were conducted in acetonitrile to assess the essential kinetic properties for flow battery performance and cycling stability of this molecule. The selected [4]helicenium ion was then evaluated by using mono- and bi-electronic cycling experiments, resulting in 745 and 80 cycles respectively, with near-perfect capacity retention. This helical carbenium ion based electrolyte achieved a proof-of-principle 2.12 V open circuit potential as an all-organic symmetric RFB.<br>

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A two-dimensional mathematical model for vanadium redox flow battery stacks incorporating nonuniform electrolyte distribution in the flow frame

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2019.02.037 ◽

2019 ◽

Vol 151 ◽

pp. 495-505 ◽

Cited By ~ 3

Author(s):

B.W. Zhang ◽

Y. Lei ◽

B.F. Bai ◽

A. Xu ◽

T.S. Zhao

Keyword(s):

Mathematical Model ◽

Vanadium Redox Flow Battery ◽

Two Dimensional ◽

Redox Flow Battery ◽

Flow Battery ◽

Vanadium Redox

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A cobalt sulfide cluster-based catholyte for aqueous flow battery applications

Journal of Materials Chemistry A ◽

10.1039/c8ta05788e ◽

2018 ◽

Vol 6 (44) ◽

pp. 21927-21932 ◽

Cited By ~ 7

Author(s):

Matthew B. Freeman ◽

Le Wang ◽

Daniel S. Jones ◽

Christopher M. Bejger

Keyword(s):

Active Material ◽

Water Soluble ◽

Molecular Cluster ◽

Cobalt Sulfide ◽

Redox Flow Battery ◽

Flow Battery ◽

Aqueous Flow ◽

Sulfide Cluster

A water-soluble Co6S8 molecular cluster was prepared and electrochemically analyzed as a potential active material for redox flow battery applications.

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