Application of the dianion croconate violet for symmetric organic non-aqueous redox flow battery electrolytes

Armstrong, Craig G.; Hogue, Ross W.; Toghill, Kathryn E.

doi:10.1016/j.jpowsour.2019.227037

Cited by 23 publications

(22 citation statements)

References 37 publications

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“…Numerous metal-coordination compounds (MCCs) [10] and redoxactive organic molecules (ROMs) [11] have been applied thus far and have demonstrated excellent properties. Most noteworthy, several symmetric NA RFBs based upon MCCs [12][13][14][15][16][17][18][19][20] and ROMs [21][22][23][24][25] have been demonstrated which mitigate crossover limitations, akin to the VRFB.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of the ferrocene/ferrocenium ion redox couple as a model chemistry for non-aqueous redox flow battery research

Armstrong

Hogue

Toghill

2020

Journal of Electroanalytical Chemistry

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The simple ferrocene/ferrocenium ion (Fc/FcBF4) redox couple was examined as a model chemistry for non-aqueous redox flow battery research. Its properties were fully characterised using voltammetry, flow-cell battery cycling, and UV-vis spectroscopy to validate flow-cell performance. Fc demonstrates facile kinetics and high stability of its oxidation states, making the Fc/FcBF4 redox couple a useful low-cost model chemistry, despite its limited 0.16 M solubility in acetonitrile. By use of 'single redox couple cycling', in which only the Fc/FcBF4 redox couple is battery cycled, the high capacity retention of Fc at 2 10 mM concentration was demonstrated; 80 % capacity retention after 200 cycles (7.8 days). The mechanism for the capacity loss was investigated and diagnosed to occur via FcBF4 decomposition in the electrolyte, which proceeds irrespective of battery cycling.

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Section: Introductionmentioning

confidence: 99%

Characterisation of the ferrocene/ferrocenium ion redox couple as a model chemistry for non-aqueous redox flow battery research

Armstrong

Hogue

Toghill

2020

Journal of Electroanalytical Chemistry

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“…Electrochemical characterization plays an essential role in evaluating RFB performance, with approaches ranging from rst-principles to device-level analyses. 14,37,38 Fundamental studies typically utilize electroanalytical techniques (e.g., cyclic voltammetry, 14,37 rotating disk voltammetry 38 ) to evaluate electrochemical and transport properties of redoxmers at dilute active species concentrations (ca. 1-10 mM [38][39][40][41][42][43] ).…”

Section: Current Methodsmentioning

confidence: 99%

On the challenges of materials and electrochemical characterization of concentrated electrolytes for redox flow batteries

et al. 2022

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“…[45][46][47][48] For example, in acetonitrile, five accessible redox states (charge = -4, -3, -2, -1, 0) were identified by cyclic voltammetry, with related redox potentials at ~-1.7, -1.4, 0.4 and 1.0 V vs. NHE. 48 The fully reduced and fully oxidized forms are rather unstable, while the intermediate radical forms (-3 and -1) were found to be stable at least to some extent, the -1 form being the most stable one. The electrochemical properties of some complexes were also studied by Fabre et al in solution.…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

“…[44][45][46][47] For this reason, its interest as both anolyte and posolyte for redox flow batteries has been recently evaluated. 48 The coordination ability of the dianion towards transition metals and lanthanides has also been explored, notably by the group of Fabre [49][50][51] and de Oliviera and Machado. [52][53][54][55][56][57] It has been shown that both oxygen and nitrogen atoms can form coordination bonds with metallic cations.…”

Section: Introductionmentioning

confidence: 99%

Deciphering the Thermal and Electrochemical Behaviors of Dual Redox-Active Iron Croconate Violet Coordination Complexes

et al. 2022

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Interest in coordination compounds based on non-innocent ligands (NILs) for electrochemical energy storage have raised in the last years. We have focused our attention on an overlooked redox active linker, croconate violet, which has not yet been addressed in this field although closely related to standard NILs such as catecholate and tetracyanoquinodimethane (TCNQ). Two anionic complexes consisting of Fe(II) and croconate violet (-2) with balancing potassium cations were isolated and structurally characterized. By a combination on in and ex situ techniques (powder and single crystal X-ray diffraction, infrared and 57 Fe Mössbauer spectroscopies), we have shown that their dehydration occurs through complex patterns, whose reversibility depends on the initial crystal structure, but that the structural rearrangements around the iron cations occur without any oxidation. While electrochemical studies performed in solution clearly shows that both the organic and inorganic parts can be reversibly addressed, in the solid state poor charge storage capacities were initially measured, mainly due to the solubilization of the solids in the electrolyte. By optimizing the formulation of the electrode and the composition of the electrolyte, a capacity of > 100 mAh g -1 after 10 cycles could be achieved. This suggests that this family of redox active linkers deserve to be investigated for solid state electrochemical energy storage, although it requires to solve the issues related to the solubilization of the derived coordination compounds.

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Application of the dianion croconate violet for symmetric organic non-aqueous redox flow battery electrolytes

Cited by 23 publications

References 37 publications

Characterisation of the ferrocene/ferrocenium ion redox couple as a model chemistry for non-aqueous redox flow battery research

Characterisation of the ferrocene/ferrocenium ion redox couple as a model chemistry for non-aqueous redox flow battery research

On the challenges of materials and electrochemical characterization of concentrated electrolytes for redox flow batteries

Deciphering the Thermal and Electrochemical Behaviors of Dual Redox-Active Iron Croconate Violet Coordination Complexes

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