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Chemical Stability of Graphite-Polypropylene Bipolar Plates for the Vanadium Redox Flow Battery at Resting State.

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Title: Chemical Stability of Graphite-Polypropylene Bipolar Plates for the Vanadium Redox Flow Battery at Resting State.
Authors: Satola, Barbara1, Kirchner, Carolina Nunes1 Carolina.Nunes-Kirchner@next-energy.de, Komsiyska, Lidiya1, Wittstock, Gunther2
Source: Journal of The Electrochemical Society. 2016, Vol. 163 Issue 10, pA2318-A2325. 8p.
Subjects: Vanadium, Oxidation-reduction reaction, Electrolytes, Graphite, Polypropylene, Electrochemical research
Abstract: Current collectors called bipolar plates (BPP) are important elements within the conversion unit of the vanadium redox flow battery (VRFB). They are in direct contact with acidic electrolytes, containing vanadium species in different oxidation states. The influence of the state of charge (SOC) on the calendar aging of BPPs was examined. Graphite-polypropylene BPPs were immersed in positive and negative vanadium electrolytes at 0%, 20%, 80% and 100% SOC for 30, 90 and 190 days. H2 gas evolution was observed as side reaction on the surface of the BPPs in the negative electrolyte. After electroless aging, scanning electron (SEM) and confocal microscopy measurements showed no significant changes in the surface morphology. The electrical conductivities of the BPPs were not affected significantly. However, contact angle (θ) measurements revealed that the positive electrolyte influenced the wettability of the BPPs. X-ray photoelectron (XP) spectroscopy showed progressing oxidation of the BPP surfaces in the positive electrolyte and adsorption or entrapment of vanadium ions in the pores at high SOC. Cyclic voltammograms (CV) provided evidence that the graphite was oxidized combined with an increase in effective surface area. ATR-FTIR measurements showed slight oxidation of pure polypropylene granulate in the positive electrolyte with 100% SOC. [ABSTRACT FROM AUTHOR]
Copyright of Journal of The Electrochemical Society is the property of IOP Publishing 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.)
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DbLabel: Engineering Source
An: 119112943
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PubTypeId: academicJournal
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  Data: Chemical Stability of Graphite-Polypropylene Bipolar Plates for the Vanadium Redox Flow Battery at Resting State.
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  Data: <searchLink fieldCode="AR" term="%22Satola%2C+Barbara%22">Satola, Barbara</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kirchner%2C+Carolina+Nunes%22">Kirchner, Carolina Nunes</searchLink><relatesTo>1</relatesTo><i> Carolina.Nunes-Kirchner@next-energy.de</i><br /><searchLink fieldCode="AR" term="%22Komsiyska%2C+Lidiya%22">Komsiyska, Lidiya</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wittstock%2C+Gunther%22">Wittstock, Gunther</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+The+Electrochemical+Society%22">Journal of The Electrochemical Society</searchLink>. 2016, Vol. 163 Issue 10, pA2318-A2325. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Vanadium%22">Vanadium</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation-reduction+reaction%22">Oxidation-reduction reaction</searchLink><br /><searchLink fieldCode="DE" term="%22Electrolytes%22">Electrolytes</searchLink><br /><searchLink fieldCode="DE" term="%22Graphite%22">Graphite</searchLink><br /><searchLink fieldCode="DE" term="%22Polypropylene%22">Polypropylene</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+research%22">Electrochemical research</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Current collectors called bipolar plates (BPP) are important elements within the conversion unit of the vanadium redox flow battery (VRFB). They are in direct contact with acidic electrolytes, containing vanadium species in different oxidation states. The influence of the state of charge (SOC) on the calendar aging of BPPs was examined. Graphite-polypropylene BPPs were immersed in positive and negative vanadium electrolytes at 0%, 20%, 80% and 100% SOC for 30, 90 and 190 days. H2 gas evolution was observed as side reaction on the surface of the BPPs in the negative electrolyte. After electroless aging, scanning electron (SEM) and confocal microscopy measurements showed no significant changes in the surface morphology. The electrical conductivities of the BPPs were not affected significantly. However, contact angle (θ) measurements revealed that the positive electrolyte influenced the wettability of the BPPs. X-ray photoelectron (XP) spectroscopy showed progressing oxidation of the BPP surfaces in the positive electrolyte and adsorption or entrapment of vanadium ions in the pores at high SOC. Cyclic voltammograms (CV) provided evidence that the graphite was oxidized combined with an increase in effective surface area. ATR-FTIR measurements showed slight oxidation of pure polypropylene granulate in the positive electrolyte with 100% SOC. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of The Electrochemical Society is the property of IOP Publishing 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:
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      – Type: doi
        Value: 10.1149/2.0841610jes
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 8
        StartPage: A2318
    Subjects:
      – SubjectFull: Vanadium
        Type: general
      – SubjectFull: Oxidation-reduction reaction
        Type: general
      – SubjectFull: Electrolytes
        Type: general
      – SubjectFull: Graphite
        Type: general
      – SubjectFull: Polypropylene
        Type: general
      – SubjectFull: Electrochemical research
        Type: general
    Titles:
      – TitleFull: Chemical Stability of Graphite-Polypropylene Bipolar Plates for the Vanadium Redox Flow Battery at Resting State.
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            NameFull: Satola, Barbara
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            NameFull: Kirchner, Carolina Nunes
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            NameFull: Komsiyska, Lidiya
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            NameFull: Wittstock, Gunther
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            – D: 01
              M: 09
              Text: 2016
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