Multichannel Electrochemical Impedance Spectroscopy and equivalent circuit synthesis of a large-scale vanadium redox flow battery

Trovò, Andrea; Zamboni, Walter; Guarnieri, Massimo

doi:10.1016/j.jpowsour.2021.229703

Cited by 29 publications

(5 citation statements)

References 57 publications

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“…In this section, a proposed electrical equivalent circuit [20] of a conventional RFB is adapted and used as an approximation for the microfluidic membraneless case. This circuit consists of a structure that is repeated for each cell of a conventional battery stack, so only one of these structures is used as shown in Fig.…”

Section: A Electrical Equivalent Circuit Model Structurementioning

confidence: 99%

“…The voltage at V c corresponds to the accessible output of the cell. This is a simple model which, like other works in the literature [20], does not reflect shunt currents and the output power is considered before auxiliary power consumption (pumping system). In addition, mass transfer diffusion is excluded, which is usually modelled with a Warburg impedance.…”

Section: A Electrical Equivalent Circuit Model Structurementioning

confidence: 99%

“…Several works have addressed the electric characterization of conventional redox flow batteries by proposing different equivalent electrical circuits that match the RFB responses to electrochemical impedance spectrometry [17], [18], [19], [20], [21]. These equivalent circuits consist of a source and a combination of impedances of different types and in different configurations.…”

Section: Introductionmentioning

confidence: 99%

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Electrical Model of a Membraneless Micro Redox Flow Battery—Fluid Dynamics Influence

Quirós¹,

Quintero²,

Francés³

et al. 2023

IEEE Access

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Membraneless micro redox flow batteries are an incipient technology that has been shown to extend some properties of traditional redox flow batteries. Due to their microfluidic scale and the absence of membrane, the fluid dynamics operation is critical in the electrical response. In this work, an electrical model is established to evaluate the influence on three battery performance metrics: steady-state power, power transient dynamics, and mixing and self-discharge losses. First, an equivalent electrical circuit, derived from a state-of-the-art regular battery equivalent circuit, is defined by studying the influence of flow changes on its impedances and source, aggregating it as a variable. Then, empirical data are used to demonstrate the proposed equations defining the variation of the electrical response relative to fluid dynamics, and their parameters are identified with grey box methods. The steady-state power model incorporates the interphase position, extending conventionally used redox flow batteries expressions, such as Faraday´s Law and Nersnt´s equation, for the membraneless analysis. A transient response model is built, which becomes effectively relevant in intermittent power applications (such as many renewable energy storage ones). Finally, mixing and self-discharge losses are evaluated with the variation state of charge at the outputs of the cell, using spectrophotometry measurements, and compared with flowmeter mixing values. This demonstrates that flow-rate values can provide a precise quantification of these losses. The electrical model with dependent parameters from the three fluid dynamics analyses can be used to evaluate the performance of micro membraneless redox flow batteries and their response to fluidic operation.INDEX TERMS Battery efficiency, electric equivalent model, grey box identification, microfluidics, redox flow battery.

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Section: A Electrical Equivalent Circuit Model Structurementioning

confidence: 99%

Section: A Electrical Equivalent Circuit Model Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrical Model of a Membraneless Micro Redox Flow Battery—Fluid Dynamics Influence

Quirós¹,

Quintero²,

Francés³

et al. 2023

IEEE Access

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“…In RFBs, gases are often found in the upper volume of tanks. For example, in a VRFB, hydrogen production becomes important when the battery is charged over the rated maximum state of charge [19]. Table 1 describes the different risks associated with these gases and a possible protection for each of them.…”

Section: Gaseous Emissionmentioning

confidence: 99%

Redox Flow Batteries: A Glance at Safety and Regulation Issues

et al. 2023

Self Cite

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Redox flow batteries (RFB) are considered one of the most promising electrochemical energy storage technologies for stationary storage applications, especially for long duration energy storage services. RFBs are electrochemical energy converters that use flowing media as or with active materials, where the electrochemical reactions can be reversed. Knowledge of technical standards and other regulations lay the foundations for successful and safe commercialization of products through uniform instructions and generally applicable rules. A small number of papers on safety and regulatory issues of RFBs are reported in the literature, mainly for two reasons. First, because this technology is considered safe; and second, because most of the publications have been limited to short-term characterization studies of materials in chemistry. This paper aims to help fill this gap, providing researchers and students with introductory knowledge on the safety and regulatory aspects of RFBs, mainly from an electrical and hydraulic point of view. The reader is referred to specific regulations for deeper studies and analyses.

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“…EIS measurement is a powerful technique to investigate the electrochemical processes occurring at electrode/ electrolyte interfaces. [45][46][47] To further probe the electrocatalytic activity in the presence of single, binary, ternary, and quaternary metal ions in the V 3+ /V 2+ redox reaction, EIS tests were performed at the applied potential of À0.6 V (vs SCE). As seen in Figure 7, all Nyquist graphs consist of semicircular and linear parts in the high-and low-frequency regions, respectively.…”

Section: Eis Analysismentioning

confidence: 99%

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction

Özçelik

Ertekin

Pekmez

et al. 2022

Intl J of Energy Research

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Summary The electrocatalytic effect of Sb3+, Bi3+, Cu2+, and Sn2+ ions is investigated for V3+/V2+ redox reaction on graphite electrode, and their binary, ternary, and quaternary ions are also studied for the first time. Herein, metal ions are reduced, and the electrodeposition of metals is carried out in situ during the V3+/V2+ redox reaction by a rapid one‐step process. Scanning electron microscope‐energy dispersive X‐ray mapping analyses show that target metals are homogeneously distributed on the electrode surface and deposited in nano‐sized particles with the size of 50 to 100 nm. The deposited metals and metal alloys are also verified by X‐ray photoelectron spectroscopy. A series of cyclic voltammogram studies for the V3+/V2+ couple in the presence of different metal ion compositions are performed to examine Ipa/Ipc and ∆E values. Sb3+ has the Ipa/Ipc (0.81) value closest to 1 and the smallest ∆E (118 mV) values among the single ions. Electrochemical impedance spectroscopy experiments reveal a significant decrease in the charge transfer resistance value for the V3+/V2+ redox couple in all‐metal combinations. The best electrochemical activities are achieved in the presence of metal combinations containing Sb and Bi, and the lowest Rct value (0.11 Ω) is reached in the Cu‐Sb‐Bi alloy. The present study suggests that the in situ modification of the graphite electrode with nano‐particles of metals and metal alloys by one‐step electrochemical deposition exhibits potential use for vanadium redox flow batteries.

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Multichannel Electrochemical Impedance Spectroscopy and equivalent circuit synthesis of a large-scale vanadium redox flow battery

Cited by 29 publications

References 57 publications

Electrical Model of a Membraneless Micro Redox Flow Battery—Fluid Dynamics Influence

Electrical Model of a Membraneless Micro Redox Flow Battery—Fluid Dynamics Influence

Redox Flow Batteries: A Glance at Safety and Regulation Issues

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction

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Multichannel Electrochemical Impedance Spectroscopy and equivalent circuit synthesis of a large-scale vanadium redox flow battery

Cited by 29 publications

References 57 publications

Electrical Model of a Membraneless Micro Redox Flow Battery—Fluid Dynamics Influence

Electrical Model of a Membraneless Micro Redox Flow Battery—Fluid Dynamics Influence

Redox Flow Batteries: A Glance at Safety and Regulation Issues

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V 3 + / V 2 + redox reaction

Contact Info

Product

Resources

About

A simple in situ deposition of metal alloys on graphite surface based on Sb, Bi, Cu, and Sn as an electrocatalyst for V ³ ⁺ / V ² ⁺ redox reaction