Electrochemically driven evolution of Br-containing aqueous solution composition

Petrov, Mikhail M.; Конев, Д. В.; Kuznetsov, V. V.; Antipov, A. E.; Glazkov, Artem T.; Воротынцев, М. А.

doi:10.1016/j.jelechem.2019.01.070

Cited by 20 publications

(14 citation statements)

References 30 publications

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“…Figure 5 shows the charge-discharge curves obtained in the second cycle. The voltage curve vs. the capacity during the charging process shows a stepwise growth in the region of 0.07 A h, which is common for similar dependences of the bromine-water system equilibrium potential predicted earlier for the electrooxidation of the bromide anion to the bromate anion [25]. The discharge capacity of the AQBRFB was 0.29 A h, which corresponds to 67% of the theoretically available 0.43 Ah.…”

Section: Resultssupporting

confidence: 75%

“…Nevertheless, t in the acidic supporting electrolyte had an excess capacity determine transition in LiBrO3. Therefore, the total capacity of the posolyte rem higher than in the negolyte, since each bromate molecule can be reduc transition and the AQDSH2 molecule can only be oxidized by releasing Figure 5 shows the charge-discharge curves obtained in the secon curve vs. the capacity during the charging process shows a stepwise g of 0.07 A h, which is common for similar dependences of the brominelibrium potential predicted earlier for the electrooxidation of the br bromate anion [25]. The discharge capacity of the AQBRFB was 0.29 sponds to 67% of the theoretically available 0.43 Ah.…”

Section: Resultsmentioning

confidence: 52%

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Successful Charge–Discharge Experiments of Anthraquinone-Bromate Flow Battery: First Report

et al. 2022

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The proposed anthraquinone-bromate cell combines the advantages of anthraquinone-bromine redox flow batteries and novel hybrid hydrogen-bromate flow batteries. The anthraquinone-2,7-disulfonic acid is of interest as a promising organic negolyte due its high solubility, rapid kinetics of electrode reactions and suitable redox potentials combined with a high chemical stability during redox reactions. Lithium or sodium bromates as posolytes provide an anomalously high discharge current density of order ~A cm−2 due to a novel autocatalytic mechanism. Combining these two systems, we developed a single cell of novel anthraquinone-bromate flow battery, which showed a power density of 1.08 W cm−2, energy density of 16.1 W h L−1 and energy efficiency of 72% after 10 charge–discharge cycles.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 52%

Successful Charge–Discharge Experiments of Anthraquinone-Bromate Flow Battery: First Report

et al. 2022

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“…The process of the oxidative transformation of a bromide solution, in particular up to the bromate one, has been extensively explored in the literature. Its first stage gives molecular bromine where the tribromide ion, Br 3 − , is present as an intermediate, in conformity with the thermodynamic analysis and experimental studies of the solution composition [52][53][54][55]. Even though thermodynamic analysis predicts a direct transition of Br 2 to bromate in the course of a further oxidation process, its multi-electron character excludes it as a direct electrode reaction.…”

Section: Introductionsupporting

confidence: 74%

A Hydrogen-Bromate Flow Battery as a Rechargeable Chemical Power Source

et al. 2022

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The hydrogen-bromate flow battery represents one of the promising variants for hybrid power sources. Its membrane-electrode assembly (MEA) combines a hydrogen gas diffusion anode and a porous flow-through cathode where bromate reduction takes place from its acidized aqueous solution: BrO3− + 6 H+ + 6 e− = Br− + 3 H2O (*). The process of electric current generation occurs on the basis of the overall reaction: 3 H2 + BrO3− = Br− + 3 H2O (**), which has been studied in previous publications. Until this work, it has been unknown whether this device is able to function as a rechargeable power source. This means that the bromide anion, Br−, should be electrooxidized into the bromate anion, BrO3−, in the course of the charging stage inside the same cell under strongly acidic conditions, while until now this process has only been carried out in neutral or alkaline solutions with specially designed anode materials. In this study, we have demonstrated that processes (*) and (**) can be performed in a cyclic manner, i.e., as a series of charge and discharge stages with the use of MEA: H2, Freidenberg H23C8 Pt-C/GP-IEM 103/Sigracet 39AA, HBr + H2SO4; square cross-section of 4 cm2 surface area, under an alternating galvanostatic mode at a current density of 75 mA/cm2. The coulombic, voltaic and energy efficiencies of the flow battery under a cyclic regime, as well as the absorption spectra of the catholyte, were measured during its operation. The total amount of Br-containing compounds penetrating through the membrane into the anode space was also determined.

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“…Unless otherwise mentioned, the following conditions were used: 25 mL of negolyte (2,7-AQDS or AS mixture), 50 mL of posolyte (0.5 M Br 2 /3.5 M HBr, the discharge capacity of posolyte is intentionally excessive in order to prevent the appearance of corrosive molecular bromine even at fully charged state of the battery [ 52 ]), serpentine flow field, Nafion 211 membrane, electrolyte flow rate 100 mL min −1 .…”

Section: Methodsmentioning

confidence: 99%

Mixture of Anthraquinone Sulfo-Derivatives as an Inexpensive Organic Flow Battery Negolyte: Optimization of Battery Cell

et al. 2022

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Anthraquinone-2,7-disulfonic acid (2,7-AQDS) is a promising organic compound, which is considered as a negolyte for redox flow batteries as well as for other applications. In this work we carried out a well-known reaction of anthraquinone sulfonation to synthesize 2,7-AQDS in mixture with other sulfo-derivatives, namely 2,6-AQDS and 2-AQS. Redox behavior of this mixture was evaluated with cyclic voltammetry and was almost identical to 2,7-AQDS. Mixture was then assessed as a potential negolyte of anthraquinone-bromine redox flow battery. After adjusting membrane-electrode assembly composition (membrane material and flow field)), the cell demonstrated peak power density of 335 mW cm−2 (at SOC 90%) and capacity utilization, capacity retention and energy efficiency of 87.9, 99.6 and 64.2%, respectively. These values are almost identical or even higher than similar values for flow battery with 2,7-AQDS as a negolyte, while the price of mixture is significantly lower. Therefore, this work unveils the promising possibility of using a mixture of crude sulfonated anthraquinone derivatives mixture as an inexpensive negolyte of RFB.

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Electrochemically driven evolution of Br-containing aqueous solution composition

Cited by 20 publications

References 30 publications

Successful Charge–Discharge Experiments of Anthraquinone-Bromate Flow Battery: First Report

Successful Charge–Discharge Experiments of Anthraquinone-Bromate Flow Battery: First Report

A Hydrogen-Bromate Flow Battery as a Rechargeable Chemical Power Source

Mixture of Anthraquinone Sulfo-Derivatives as an Inexpensive Organic Flow Battery Negolyte: Optimization of Battery Cell

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