Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Decomposition pathways and mitigation strategies for highly-stable hydroxyphenazine flow battery anolytes

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/d1ta03655f· OSTI ID:1828012

Aqueous organic redox flow batteries are a promising technology for large-scale energy storage. The stability of the redox active organic molecules is increasingly being recognized as one of the major hurdles. Upon extended flow battery cycling, 7,8-dihydroxyphenazine-2 sulfonic acid (DHPS) undergoes desulfonation and reduction of a phenolic C–O bond to yield a mixture of 7/8-hydroxyphenazine-2-sulfonic acid, as well as hydrogenation of the aromatic ring system. Density functional theory (DFT) analysis of the charged DHPS, its ring-hydrogenated products, and variably substituted hydroxy phenazines has led to the development of a series of dihydroxylated phenazine isomers which provide insight into the effects of substitution pattern on solubility and stability. Seven dihydroxyphenazine (DHP) isomers were synthesized and their solubilities, electrochemical properties, flow battery cycling performance, and degradation pathways have been investigated. Based on theoretical and experimental results, hydroxyl substitution at the 1, 4, 6 and 9 positions yields highly stable derivatives, while substitution at the 2, 3, 7, and 8 positions results in unstable derivatives. Flow cells of 1,4- and 1,6-DHPs coupled with ferro/ferricyanide achieved high stabilities, with temporal capacity loss of 0.029 and 0.031% per day, respectively. Decomposition of 1,8- and 2,7-DHPs were found to arise from irreversible hydrogen rearrangement (tautomerization), yielding redox-inactive species. These results provide a detailed understanding of decomposition pathways and mitigation strategies for phenazine-based anolytes, and can provide general design guidelines for the development of stable redox-active organics.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Electricity (OE)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1828012
Report Number(s):
PNNL-SA--161713
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 38 Vol. 9; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (38)

Annulated Dialkoxybenzenes as Catholyte Materials for Non-aqueous Redox Flow Batteries: Achieving High Chemical Stability through Bicyclic Substitution journal July 2017
Comparison of Quinone‐Based Catholytes for Aqueous Redox Flow Batteries and Demonstration of Long‐Term Stability with Tetrasubstituted Quinones journal April 2020
Radical Compatibility with Nonaqueous Electrolytes and Its Impact on an All-Organic Redox Flow Battery journal April 2015
Redox-Flow Batteries: From Metals to Organic Redox-Active Materials journal November 2016
Biomimetic Amino Acid Functionalized Phenazine Flow Batteries with Long Lifetime at Near‐Neutral pH journal January 2021
Chemistry with ADF journal January 2001
Aqueous organic redox flow batteries journal March 2019
Synthesis of novel acridino- and phenazino-18-crown-6 ligands and their optically pure dimethyl-substituted analogues for molecular recognition studies journal January 1999
Low-energy-consumption electrochemical CO2 capture driven by biomimetic phenazine derivatives redox medium journal February 2020
Extremely Stable Anthraquinone Negolytes Synthesized from Common Precursors journal June 2020
Voltammetry study of quinoxaline in aqueous electrolytes journal October 2015
Nafion membranes as electrolyte and separator for sodium-ion battery journal September 2014
Alkaline Quinone Flow Battery with Long Lifetime at pH 12 journal September 2018
Ultrastable aqueous phenazine flow batteries with high capacity operated at elevated temperatures journal September 2021
Recent developments in organic redox flow batteries: A critical review journal August 2017
Redox-active poly(6-(1H-pyrrol-1-yl)quinoxaline) as a novel organic anode material for aqueous hybrid flow batteries journal March 2020
Unraveling pH dependent cycling stability of ferricyanide/ferrocyanide in redox flow batteries journal December 2017
Electrolyte Lifetime in Aqueous Organic Redox Flow Batteries: A Critical Review journal February 2020
On Lifetime and Cost of Redox-Active Organics for Aqueous Flow Batteries journal February 2020
TEMPO/Phenazine Combi-Molecule: A Redox-Active Material for Symmetric Aqueous Redox-Flow Batteries journal October 2016
A Neutral pH Aqueous Organic–Organometallic Redox Flow Battery with Extremely High Capacity Retention journal February 2017
Materials and Systems for Organic Redox Flow Batteries: Status and Challenges journal August 2017
Molecular Design of Fused-Ring Phenazine Derivatives for Long-Cycling Alkaline Redox Flow Batteries journal January 2020
Flow Batteries: Current Status and Trends journal September 2015
Long-Cycling Aqueous Organic Redox Flow Battery (AORFB) toward Sustainable and Safe Energy Storage journal January 2017
Electrochemical and chemical reduction of furopyrazines, thienopyrazines, furoquinoxalines and thienoquinoxalines journal August 1991
Accelerating Electrolyte Discovery for Energy Storage with High-Throughput Screening journal January 2015
Material design and engineering of next-generation flow-battery technologies journal November 2016
A metal-free organic–inorganic aqueous flow battery journal January 2014
A redox-flow battery with an alloxazine-based organic electrolyte journal July 2016
A biomimetic high-capacity phenazine-based anolyte for aqueous organic redox flow batteries journal June 2018
Alkaline quinone flow battery journal September 2015
Electrochemical reduction of pyridopyrazines journal July 1978
Electrochemical reduction of quinoxalino[2,3- b ]quinoxaline journal November 1982
Preparation, chemical and electrochemical reduction of pyrido[2,3- b ]quinoxalines and pyrido[3,4- b ]quinoxalines journal June 1988
Understanding and Mitigating Capacity Fade in Aqueous Organic Redox Flow Batteries journal January 2018
A New Michael-Reaction-Resistant Benzoquinone for Aqueous Organic Redox Flow Batteries journal January 2017
Flow Battery Molecular Reactant Stability Determined by Symmetric Cell Cycling Methods journal January 2018

Similar Records

A biomimetic high-capacity phenazine-based anolyte for aqueous organic redox flow batteries
Journal Article · Fri Jun 01 00:00:00 EDT 2018 · Nature Energy · OSTI ID:1490220

Preparation of 1,3-Dihydroxyphenazine
Journal Article · Sat Feb 08 23:00:00 EST 2025 · Organic Syntheses (Online) · OSTI ID:2997109

Characterization of Electrochemical Behavior for Aqueous Organic Redox Flow Batteries
Journal Article · Thu Dec 29 23:00:00 EST 2022 · Journal of the Electrochemical Society · OSTI ID:1909814

Related Subjects