scholarly journals Comparison of Quinone‐Based Catholytes for Aqueous Redox Flow Batteries and Demonstration of Long‐Term Stability with Tetrasubstituted Quinones

2020 ◽  
Vol 10 (20) ◽  
pp. 2000340 ◽  
Author(s):  
James B. Gerken ◽  
Colin W. Anson ◽  
Yuliya Preger ◽  
Peter G. Symons ◽  
J. David Genders ◽  
...  
Keyword(s):  
Term Stability ◽  
Long Term Stability ◽  
Redox Flow Batteries ◽  
Flow Batteries

Long-Term Stability of Nafion Hybrid Membranes for Use in Vanadium Redox-Flow Batteries

2019 ◽  
Vol 28 (30) ◽  
pp. 167-177 ◽  
Author(s):  
Julia Drillkens ◽  
Dominik Schulte ◽  
Dirk Uwe Sauer
Keyword(s):  
Hybrid Membranes ◽  
Term Stability ◽  
Long Term Stability ◽  
Redox Flow Batteries ◽  
Flow Batteries ◽  
Vanadium Redox

scholarly journals Elucidating Factors Controlling Long-Term Stability of Radical Anions for Negative Charge Storage in Nonaqueous Redox Flow Batteries

2018 ◽  
Vol 122 (15) ◽  
pp. 8116-8127 ◽  
Author(s):  
Jingjing Zhang ◽  
Jinhua Huang ◽  
Lily A. Robertson ◽  
Rajeev S. Assary ◽  
Ilya A. Shkrob ◽  
...  
Keyword(s):  
Negative Charge ◽  
Charge Storage ◽  
Radical Anions ◽  
Term Stability ◽  
Long Term Stability ◽  
Redox Flow Batteries ◽  
Flow Batteries

scholarly journals Novel, Stable Catholyte for Aqueous Organic Redox Flow Batteries: Symmetric Cell Study of Hydroquinones with High Accessible Capacity

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3823
Author(s):  
Xian Yang ◽  
Sergio Navarro Garcia ◽  
Tobias Janoschka ◽  
Dénes Kónya ◽  
Martin D. Hager ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Redox Potential ◽  
Flow Battery ◽  
Long Term Stability ◽  
Redox Flow Batteries ◽  
Molecular Stability ◽  
Flow Batteries ◽  
Cell Study ◽  
Capacity Decay

Owing to their broad range of redox potential, quinones/hydroquinones can be utilized for energy storage in redox flow batteries. In terms of stability, organic catholytes are more challenging than anolytes. The two-electron transfer feature adds value when building all-quinone flow battery systems. However, the dimerization of quinones/hydroquinones usually makes it difficult to achieve a full two-electron transfer in practical redox flow battery applications. In this work, we designed and synthesized four new hydroquinone derivatives bearing morpholinomethylene and/or methyl groups in different positions on the benzene ring to probe molecular stability upon battery cycling. The redox potential of the four molecules were investigated, followed by long-term stability tests using different supporting electrolytes and cell cycling methods in a symmetric flow cell. The derivative with two unoccupied ortho positions was found highly unstable, the cell of which exhibited a capacity decay rate of ~50% per day. Fully substituted hydroquinones turned out to be more stable. In particular, 2,6-dimethyl-3,5-bis(morpholinomethylene)benzene-1,4-diol (asym-O-5) displayed a capacity decay of only 0.45%/day with four-week potentiostatic cycling at 0.1 M in 1 M H3PO4. In addition, the three fully substituted hydroquinones displayed good accessible capacity of over 82%, much higher than those of conventional quinone derivatives.

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