Resistor Design for the Use of Dynamic Hydrogen Electrode in Vanadium Redox Flow Batteries

Choi, Chang Koon; Choi, Yunsuk; Kim, Soohwan; Jung, Ho‐Young; Kim, Hee‐Tak

doi:10.1016/j.electacta.2016.07.152

Cited by 14 publications

(33 citation statements)

References 24 publications

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“…Aer 120 cycles, both cathode and anode potential recovered to 0.8 V and −0.6 V vs. DHE. This phenomenon indicated that the potential of the DHE approached 0 V during the initial cycles, climbed progressively to 0.3 V, and then returned to 0 V. As reported, there is co-existence of H + and vanadium species in the electrolyte (nearby Pt electrodes), 4,26 thus the competition between HER and vanadium redox reaction occurs on the DHE.…”

Section: Resultssupporting

confidence: 59%

“…As reported, there is co-existence of H + and vanadium species in the electrolyte (nearby Pt electrodes), 4,26 thus the competition between HER and vanadium redox reaction occurs on the DHE.2H + + 2e − → H 2 , E ° = 0.00 VVO 2+ + 2H + + e − → V 3+ + H 2 O, E ° = 0.34 V…”

Section: Resultsmentioning

confidence: 81%

“…5 mm apart from the edge of the carbon felt electrodes of the VRFB to avoid any interference by the electric field generated between the two electrodes as well as for the ease of installation. 26,28,29 These two Pt electrodes were connected to an external electric circuit with a 9 V battery and an optimized resistor of 1 MΩ. 27 The Pt electrode that was directly connected to the negative terminal of the 9 V battery is employed as the DHE reference electrode where the hydrogen evolution reaction (HER) occurs and the current flowing through the cell is optimized using an adjustable resistor.…”

Section: Methodsmentioning

confidence: 99%

“…18,19 However, the potential for chloride contamination and a large IR drop (associated with a large distance between the RE and electrode) are the primary issue for large-scaled applications. The internal REs, such as a single probe (Pt wire 20,21 or carbon cloth/ber 22,23 ) or dynamic hydrogen electrode (DHE), [24][25][26] is typically inserted between membranes and can decouple the cathode and anode potential drop and impedance. The internal REs, such as DHE, have been extensively used for the dynamic study of a VRFB.…”

Section: Introductionmentioning

confidence: 99%

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An ultra-stable reference electrode for scaled all-vanadium redox flow batteries

et al. 2022

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An ultra-stable reference electrode for scaled all-vanadium redox flow batteries

et al. 2022

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“…The whole assembly of Teflon/membrane/silver wire/membrane/Teflon was inserted between the membranes. The adjustment of the resistor in the DHE was performed by Choi et al [82] to monitor the positive and negative potentials in the VRFB. The resistance was varied during the discharge process and the potential of each half-cell was recorded to investigate the nature of the hydrogen evolution reaction.…”

Section: Reference Electrode Configurationmentioning

confidence: 99%

In-Situ Tools Used in Vanadium Redox Flow Battery Research—Review

Ghimire¹,

Bhattarai²,

Lim

et al. 2021

Batteries

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Progress in renewable energy production has directed interest in advanced developments of energy storage systems. The all-vanadium redox flow battery (VRFB) is one of the attractive technologies for large scale energy storage due to its design versatility and scalability, longevity, good round-trip efficiencies, stable capacity and safety. Despite these advantages, the deployment of the vanadium battery has been limited due to vanadium and cell material costs, as well as supply issues. Improving stack power density can lower the cost per kW power output and therefore, intensive research and development is currently ongoing to improve cell performance by increasing electrode activity, reducing cell resistance, improving membrane selectivity and ionic conductivity, etc. In order to evaluate the cell performance arising from this intensive R&D, numerous physical, electrochemical and chemical techniques are employed, which are mostly carried out ex situ, particularly on cell characterizations. However, this approach is unable to provide in-depth insights into the changes within the cell during operation. Therefore, in situ diagnostic tools have been developed to acquire information relating to the design, operating parameters and cell materials during VRFB operation. This paper reviews in situ diagnostic tools used to realize an in-depth insight into the VRFBs. A systematic review of the previous research in the field is presented with the advantages and limitations of each technique being discussed, along with the recommendations to guide researchers to identify the most appropriate technique for specific investigations.

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In Situ Determination of the Potential Distribution within a Copper Foam Electrode in a Zinc‐Air/Silver Hybrid Flow Battery

Genthe,

Arenas,

Becker

et al. 2024

ChemElectroChem

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This work describes a novel methodology for measuring the potential distribution within the porous copper foam electrode of a zinc‐air/silver hybrid (ZASH) flow battery by using local potential probes. The suitability of dynamic hydrogen electrodes (DHEs) and a quasi‐reference electrode as probes is evaluated, with the latter chosen in view of stability. Liquid and solid‐phase potentials are recorded at varying applied current densities over multiple charge‐discharge cycles. Various zinc structures are found within specific overpotential ranges, with moss‐like structures appearing between 7.8 mV and 13.2 mV and the desired boulder structures in the range of 22 mV to 100 mV. Regardless of the current density, the highest liquid‐phase potentials are always measured in the outermost region of the porous foam near to the separator. In practice, this means that increasing the thickness of the copper foam over about 5 mm does not provide significant performance benefits. Conversely, solid‐phase potentials across the copper foam remain nearly uniform, resulting in negligible effects on local overpotential. The presented technique provides unique insights into the behavior of porous electrodes in electrochemical energy conversion technologies, facilitating the determination of the optimal properties for maximum efficiency, such as electrode thickness.

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Resistor Design for the Use of Dynamic Hydrogen Electrode in Vanadium Redox Flow Batteries

Cited by 14 publications

References 24 publications

An ultra-stable reference electrode for scaled all-vanadium redox flow batteries

An ultra-stable reference electrode for scaled all-vanadium redox flow batteries

In-Situ Tools Used in Vanadium Redox Flow Battery Research—Review

In Situ Determination of the Potential Distribution within a Copper Foam Electrode in a Zinc‐Air/Silver Hybrid Flow Battery

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