Electrochemical and Transport Characteristics of V(II)/V(III) Redox Couple in a Nonaqueous Deep Eutectic Solvent: Temperature Effect

Xu, Qian; Qin, Liyu; Su, Huaneng; Xu, Li; Leung, Puiki; Yang, Chunzhen

doi:10.1061/(asce)ey.1943-7897.0000484

Cited by 11 publications

(5 citation statements)

References 30 publications

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“…Therefore, there is no ion contamination. The final product of the reaction is water molecules, which will only dilute the electrolyte and will not pollute the environment 21 . The

{VO}^{2 +} / {VO}_{2}^{+}

and V 2+ /V 3+ redox couples are stored in a positive and negative electrolyte tank.…”

Section: Mathematical Model Of Vrfbmentioning

confidence: 99%

Numerical research on a novel flow field design for vanadium redox flow batteries in microgrid

Huang

2021

Intl J of Energy Research

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“…Therefore, there is no ion contamination. The final product of the reaction is water molecules, which will only dilute the electrolyte and will not pollute the environment 21 . The

{VO}^{2 +} / {VO}_{2}^{+}

and V 2+ /V 3+ redox couples are stored in a positive and negative electrolyte tank.…”

Section: Mathematical Model Of Vrfbmentioning

confidence: 99%

Numerical research on a novel flow field design for vanadium redox flow batteries in microgrid

Huang

2021

Intl J of Energy Research

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“…In addition, we compensated for the IR drop due to solution resistance to generate the plots in Figure 5b, thereby ensuring that the shapes are very similar to those obtained from a flat GC working electrode. However, this needs to be systematically investigated in future as performed elsewhere for V(II)/V(III) electrochemistry in DES [54].…”

Section: Cyclic Voltammetry Of V(acac) 3 In Il and Des With Pristine And N-g-modified Cp Electrodesmentioning

confidence: 99%

Evaluation of a Non-Aqueous Vanadium Redox Flow Battery Using a Deep Eutectic Solvent and Graphene-Modified Carbon Electrodes via Electrophoretic Deposition

et al. 2020

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Common issues aqueous-based vanadium redox flow batteries (VRFBs) face include low cell voltage due to water electrolysis side reactions and highly corrosive and environmentally unfriendly electrolytes (3 to 5 M sulfuric acid). Therefore, this investigation looks into the comparison of a highly conductive ionic liquid with a well-studied deep eutectic solvent (DES) as electrolytes for non-aqueous VRFBs. The latter solvent gives 50% higher efficiency and capacity utilization than the former. These figures of merit increase by 10% when nitrogen-doped graphene (N-G)-modified carbon papers, via a one-step binder-free electrophoretic deposition process, are used as electrodes. X-ray computed tomography confirms the enhancement of electrochemical surface area of the carbon electrodes due to N-G while electrochemical impedance spectra show the effect of its higher conductivity on improving RFB performance. Finally, potential strategies for the scaling-up of DES-based VRFBs using a simple economical model are also briefly discussed. From this study, it is deduced that more investigations on applying DESs as non-aqueous electrolytes to replace the commonly used acetonitrile may be a positive step forward because DESs are not only cheaper but also safer to handle, far less toxic, non-flammable, and less volatile than acetonitrile.

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“…Metal ions are also widely used as additives of electrolytes for electrochemical energy system. Antimony (Sb) has the advantages of low cost, good chemical stability, and high catalytic activity, such that it is widely used in the field of electrocatalysis and battery [23,34]. In 2015, Shen et al introduced SbCl 3 into a vanadium redox flow battery (VRFB) [35].…”

Section: Introductionmentioning

confidence: 99%

Effects of Electrolyte Additives on Nonaqueous Redox Flow Batteries

Xu¹,

Yang²,

Su³

2020

Redox

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The widespread utilization of nonaqueous redox flow batteries is hindered by the low performance. Including some kinds of additives in electrolyte is a possible and facile solution. In this chapter, the effects of carbon dioxide gas, EC/DMC, and antimony ions on the electrochemical performance of nonaqueous redox flow batteries are disclosed. The results show that the ohmic resistance of the deep eutectic solvent (DES) electrolyte reduces significantly when adding carbon dioxide gas and EC/DMC, the percentage of reduction increases with the volume percentage of EC/ DMC in electrolyte, and the reaction kinetics almost keeps unchanged for carbon dioxide gas and EC/DMC additives. For the additive of antimony ions, the electrochemical reaction kinetics of active redox couple is enhanced, the diffusion coefficient of active ions also increases, and the charge transfer resistance decreases. The antimony ions electrodeposited on the surface of graphite felt contribute a catalytic effect on the electrochemical reaction so as to improve the performance. However, due to the trade-off between the enhanced kinetics and reduced active surface area, the optimum concentration of antimony ions is found to be 15 mM. In addition, the flow battery assembled with negative electrolyte containing antimony ions exhibits 31.2% higher power density than that of pristine DES electrolyte.

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Electrochemical and Transport Characteristics of V(II)/V(III) Redox Couple in a Nonaqueous Deep Eutectic Solvent: Temperature Effect

Cited by 11 publications

References 30 publications

Numerical research on a novel flow field design for vanadium redox flow batteries in microgrid

Numerical research on a novel flow field design for vanadium redox flow batteries in microgrid

Evaluation of a Non-Aqueous Vanadium Redox Flow Battery Using a Deep Eutectic Solvent and Graphene-Modified Carbon Electrodes via Electrophoretic Deposition

Effects of Electrolyte Additives on Nonaqueous Redox Flow Batteries

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