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Operando studies on through-plane cell voltage losses in vanadium redox flow battery.

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Title: Operando studies on through-plane cell voltage losses in vanadium redox flow battery.
Authors: Lim, Hyebin1 (AUTHOR), Yi, Jung S.1,2 (AUTHOR) jungsyi.hope@gmail.com, Lee, Doohwan1 (AUTHOR) dolee@uos.ac.kr
Source: Journal of Power Sources. May2019, Vol. 422, p65-72. 8p.
Subjects: Vanadium redox battery, Electric potential, Standard hydrogen electrode, Oxidation-reduction reaction, Potential distribution
Abstract: Abstract Through-plane potential and overpotential distributions in a vanadium redox flow battery (VRFB) is investigated in-situ using saturated Ag/AgCl reference electrodes attached to each side of the membrane with edge-type configuration. Combined with electrochemical impedance spectroscopy (EIS), this operando approach enables detailed quantification of the voltage losses contributed from the individual VRFB cell components with the magnitudes of ohmic and charge transfer losses at practical charge-discharge conditions. It is found that the overpotentials for vanadium redox reactions on graphite felt electrodes at the positive and negative half-cells are one order magnitude larger than the voltage loss through the typical cation-exchange membrane (Nafion®117) for charging-discharging at current densities from 50 to 120 mA cm−2. Within the overall half-cell overpotentials, the ohmic voltage loss accounts for about 40%. The analysis reveals that the voltage loss by the anode charge transfer reaction is about three folds larger than that by the cathode reaction, suggesting that sluggish V2+/V3+ redox kinetics in the negative half-cell is the major factor limiting the overall VRFB cell performance. This operando methodology is effective for the in-depth analysis of VRFB performance in practical conditions as well as the development of high-performance cell components and efficient total cell design by a collective and quantitative approach. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Power Sources is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 135743377
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Operando studies on through-plane cell voltage losses in vanadium redox flow battery.
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  Data: <searchLink fieldCode="AR" term="%22Lim%2C+Hyebin%22">Lim, Hyebin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yi%2C+Jung+S%2E%22">Yi, Jung S.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> jungsyi.hope@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Lee%2C+Doohwan%22">Lee, Doohwan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dolee@uos.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Power+Sources%22">Journal of Power Sources</searchLink>. May2019, Vol. 422, p65-72. 8p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Vanadium+redox+battery%22">Vanadium redox battery</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+potential%22">Electric potential</searchLink><br /><searchLink fieldCode="DE" term="%22Standard+hydrogen+electrode%22">Standard hydrogen electrode</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation-reduction+reaction%22">Oxidation-reduction reaction</searchLink><br /><searchLink fieldCode="DE" term="%22Potential+distribution%22">Potential distribution</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract Through-plane potential and overpotential distributions in a vanadium redox flow battery (VRFB) is investigated in-situ using saturated Ag/AgCl reference electrodes attached to each side of the membrane with edge-type configuration. Combined with electrochemical impedance spectroscopy (EIS), this operando approach enables detailed quantification of the voltage losses contributed from the individual VRFB cell components with the magnitudes of ohmic and charge transfer losses at practical charge-discharge conditions. It is found that the overpotentials for vanadium redox reactions on graphite felt electrodes at the positive and negative half-cells are one order magnitude larger than the voltage loss through the typical cation-exchange membrane (Nafion®117) for charging-discharging at current densities from 50 to 120 mA cm−2. Within the overall half-cell overpotentials, the ohmic voltage loss accounts for about 40%. The analysis reveals that the voltage loss by the anode charge transfer reaction is about three folds larger than that by the cathode reaction, suggesting that sluggish V2+/V3+ redox kinetics in the negative half-cell is the major factor limiting the overall VRFB cell performance. This operando methodology is effective for the in-depth analysis of VRFB performance in practical conditions as well as the development of high-performance cell components and efficient total cell design by a collective and quantitative approach. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Power Sources is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.jpowsour.2019.03.016
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 65
    Subjects:
      – SubjectFull: Vanadium redox battery
        Type: general
      – SubjectFull: Electric potential
        Type: general
      – SubjectFull: Standard hydrogen electrode
        Type: general
      – SubjectFull: Oxidation-reduction reaction
        Type: general
      – SubjectFull: Potential distribution
        Type: general
    Titles:
      – TitleFull: Operando studies on through-plane cell voltage losses in vanadium redox flow battery.
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            NameFull: Lim, Hyebin
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            NameFull: Yi, Jung S.
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            NameFull: Lee, Doohwan
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            – D: 15
              M: 05
              Text: May2019
              Type: published
              Y: 2019
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              Value: 422
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            – TitleFull: Journal of Power Sources
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