Highly water-soluble three-redox state organic dyes as bifunctional analytes

2016 ◽  
Vol 9 (11) ◽  
pp. 3521-3530 ◽  
Author(s):  
Javier Carretero-González ◽  
Elizabeth Castillo-Martínez ◽  
Michel Armand
Keyword(s):  
Redox State ◽  
Organic Dyes ◽  
Water Soluble ◽  
Redox States ◽  
Redox Flow Batteries ◽  
Flow Batteries

Common organic dyes show three stable redox states, offering an alternative to questionable vanadium for the implementation of redox-flow batteries.

An organic super-electron-donor as a high energy density negative electrolyte for nonaqueous flow batteries

2019 ◽  
Vol 55 (74) ◽  
pp. 11037-11040 ◽  
Author(s):  
Thomas P. Vaid ◽  
Melanie S. Sanford
Keyword(s):  
Energy Density ◽  
Electron Donor ◽  
Reduction Potential ◽  
High Energy ◽  
High Energy Density ◽  
Redox States ◽  
Redox Flow Batteries ◽  
Good Solubility ◽  
Flow Batteries ◽  
Low Mass

An organic “super-electron-donor” is well-suited as a negative electrolyte for nonaqueous redox flow batteries, with a highly negative 2+/0 reduction potential, a low mass per electron stored, and good solubility in CH3CN in both redox states.

Aqueous Symmetrical Redox Flow Batteries Based Upon a pH-Responsive Cobalt Complex

2019 ◽  
Author(s):  
Hao Wang ◽  
Sayed Youssef Sayed ◽  
Yuqiao Zhou ◽  
Brian Olsen ◽  
Erik J. Luber ◽  
...  
Keyword(s):  
Cobalt Complex ◽  
Redox Properties ◽  
Water Soluble ◽  
Cobalt Metal ◽  
Ph Responsive ◽  
Fast Kinetics ◽  
Redox Flow Batteries ◽  
Redox Couples ◽  
Flow Batteries ◽  
Carboxylic Groups

<div>Aqueous symmetric redox flow batteries (RFB) are of great interest due to the non-flammability and high conductivity of the solvent, and avoidance of irreversible anolyte crossover seen in asymmetric cells. In this work, we introduce a simple octahedral Co(II) complex, termed BCPIP-Co(II), that has 4 appended carboxylic groups on the ligand periphery that render it both water-soluble and pH-sensitive in the range of pH 1.5 - 5.5. The complex has reversible BCPIP-Co(II-III) and BCPIP-Co(II-I) redox couples within the water splitting window, as well as fast kinetics. The overall charge of the complex varies from +3 to -3, resulting from the level of deprotonation of the carboxylic acid moieties and the oxidation state of the cobalt metal center, both of which affect the resulting redox properties. BCPIP-Co(II) was then incorporated, as both the posolyte and negolyte, into a symmetric aqueous RFB, demonstrating Coulombic efficiencies >99% for up to 100 cycles.</div>

Aqueous Symmetrical Redox Flow Batteries Based Upon a pH-Responsive Cobalt Complex

2019 ◽  
Author(s):  
Hao Wang ◽  
Sayed Youssef Sayed ◽  
Yuqiao Zhou ◽  
Brian Olsen ◽  
Erik J. Luber ◽  
...  
Keyword(s):  
Cobalt Complex ◽  
Redox Properties ◽  
Water Soluble ◽  
Cobalt Metal ◽  
Ph Responsive ◽  
Fast Kinetics ◽  
Redox Flow Batteries ◽  
Redox Couples ◽  
Flow Batteries ◽  
Carboxylic Groups

<div>Aqueous symmetric redox flow batteries (RFB) are of great interest due to the non-flammability and high conductivity of the solvent, and avoidance of irreversible anolyte crossover seen in asymmetric cells. In this work, we introduce a simple octahedral Co(II) complex, termed BCPIP-Co(II), that has 4 appended carboxylic groups on the ligand periphery that render it both water-soluble and pH-sensitive in the range of pH 1.5 - 5.5. The complex has reversible BCPIP-Co(II-III) and BCPIP-Co(II-I) redox couples within the water splitting window, as well as fast kinetics. The overall charge of the complex varies from +3 to -3, resulting from the level of deprotonation of the carboxylic acid moieties and the oxidation state of the cobalt metal center, both of which affect the resulting redox properties. BCPIP-Co(II) was then incorporated, as both the posolyte and negolyte, into a symmetric aqueous RFB, demonstrating Coulombic efficiencies >99% for up to 100 cycles.</div>

scholarly journals Sulfonated tryptanthrin anolyte increases performance in pH neutral aqueous redox flow batteries

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Daniela Pinheiro ◽  
Marta Pineiro ◽  
J. Sérgio Seixas de Melo
Keyword(s):  
Alternative Energy ◽  
Active Material ◽  
High Energy ◽  
Disodium Salt ◽  
Water Soluble ◽  
Great Promise ◽  
Safe Alternative ◽  
Redox Flow Batteries ◽  
Neutral Ph ◽  
Flow Batteries

AbstractAqueous organic redox flow batteries (AORFBs) hold great promise as low-cost, environmentally friendly and safe alternative energy storage media. Here we present aqueous organometallic and all-organic active materials for RFBs with a water-soluble active material, sulfonated tryptanthrin (TRYP-SO3H), working at a neutral pH and showing long-term stability. Electrochemical measurements show that TRYP-SO3H displays reversible peaks at neutral pH values, allowing its use as an anolyte combined with potassium ferrocyanide or 4,5-dihydroxy-1,3-benzenedisulfonic acid disodium salt monohydrate as catholytes. Single cell tests show reproducible charge-discharge cycles for both catholytes, with significantly improved results for the aqueous all-organic RFB reaching high cell voltage (0.94 V) and high energy efficiencies, stabilized during at least 50 working cycles.

Water-soluble pH-switchable cobalt complexes for aqueous symmetric redox flow batteries

2020 ◽  
Vol 56 (25) ◽  
pp. 3605-3608 ◽  
Author(s):  
Hao Wang ◽  
Sayed Youssef Sayed ◽  
Yuqiao Zhou ◽  
Brian C. Olsen ◽  
Erik J. Luber ◽  
...  
Keyword(s):  
Water Splitting ◽  
Cobalt Complex ◽  
Cobalt Complexes ◽  
Water Soluble ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Redox Flow Batteries ◽  
Redox Couples ◽  
Flow Batteries

A water soluble cobalt complex with two redox couples that fall within the water splitting window can be applied as both the posolyte and negolyte in an aqueous symmetric redox flow battery.

Synthesis and characterization of TEMPO- and viologen-polymers for water-based redox-flow batteries

2015 ◽  
Vol 6 (45) ◽  
pp. 7801-7811 ◽  
Author(s):  
T. Janoschka ◽  
S. Morgenstern ◽  
H. Hiller ◽  
C. Friebe ◽  
K. Wolkersdörfer ◽  
...  
Keyword(s):  
Water Soluble ◽  
Synthesis And Characterization ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Redox Flow Batteries ◽  
Water Based ◽  
Flow Batteries

Water-soluble polymers for application in polymer-based redox-flow batteries (pRFB) were synthesized and their properties were studied in detail.

scholarly journals Progress and directions in low-cost redox-flow batteries for large-scale energy storage

2017 ◽  
Vol 4 (1) ◽  
pp. 91-105 ◽  
Author(s):  
Bin Li ◽  
Jun Liu
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Low Cost ◽  
Lithium Ion ◽  
High Energy ◽  
Water Soluble ◽  
Side Reactions ◽  
Aqueous Systems ◽  
Redox Flow Batteries ◽  
Flow Batteries

Abstract Compared to lithium-ion batteries, redox-flow batteries have attracted widespread attention for long-duration, large-scale energy-storage applications. This review focuses on current and future directions to address one of the most significant challenges in energy storage: reducing the cost of redox-flow battery systems. A high priority is developing aqueous systems with low-cost materials and high-solubility redox chemistries. Highly water-soluble inorganic redox couples are important for developing technologies that can provide high energy densities and low-cost storage. There is also great potential to rationally design organic redox molecules and fine-tune their properties for both aqueous and non-aqueous systems. While many new concepts begin to blur the boundary between traditional batteries and redox-flow batteries, breakthroughs in identifying/developing membranes and separators and in controlling side reactions on electrode surfaces also are needed.

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