Bulk Aging of Graphite-Polypropylene Current Collectors Induced by Electrochemical Cycling in the Positive Electrolyte of Vanadium Redox Flow Batteries.
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| Title: | Bulk Aging of Graphite-Polypropylene Current Collectors Induced by Electrochemical Cycling in the Positive Electrolyte of Vanadium Redox Flow Batteries. |
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| Authors: | Satola, Barbara1,2 Barbara.Satola@next-energy.de, Komsiyska, Lidiya3, Wittstock, Gunther2 |
| Source: | Journal of The Electrochemical Society. 2017, Vol. 164 Issue 12, pA2566-A2572. 7p. |
| Subjects: | Vanadium redox battery, Electric conductivity, Electrochemical analysis |
| Abstract: | Carbon-based bipolar plates (BPP) are essential components of the vanadium redox flow battery (VRFB) stack guaranteeing electrical conductivity and physical separation of adjacent cells. They are usually made of composite materials with complex structures containing conductive carbon components and polymer binder materials. In order to investigate their aging by simulation of repetitive charging/discharging conditions in areas with sluggish electrolyte flow, commercially available graphite-polypropylene BPPs were subjected to galvanodynamic treatment under diffusion limitation conditions in a three electrode electrochemical cell with positive electrolyte (VO2+/VO2+) using different states of charge (SOC). The current was swept between 100 and -100 mA/cm². After aging, cyclic voltammetry (CV) in diluted H2SO4 was used to analyze the change in double layer capacitance and redox activity of the BPPs. Morphological investigations of the surface texture and bulk material were performed by means of scanning electron and confocal microscopies as well as by X-ray computed microtomography. After 3000 sweeping cycles in the positive electrolyte at high SOC the BPP showed an increase in double layer capacitance as well as higher roughness and increase in open pore volume in depths up to 100 μm. The aging effects are ascribed to oxidation and corrosion of the surface. [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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 126306114 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Bulk Aging of Graphite-Polypropylene Current Collectors Induced by Electrochemical Cycling in the Positive Electrolyte of Vanadium Redox Flow Batteries. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Satola%2C+Barbara%22">Satola, Barbara</searchLink><relatesTo>1,2</relatesTo><i> Barbara.Satola@next-energy.de</i><br /><searchLink fieldCode="AR" term="%22Komsiyska%2C+Lidiya%22">Komsiyska, Lidiya</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Wittstock%2C+Gunther%22">Wittstock, Gunther</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+The+Electrochemical+Society%22">Journal of The Electrochemical Society</searchLink>. 2017, Vol. 164 Issue 12, pA2566-A2572. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Vanadium+redox+battery%22">Vanadium redox battery</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+conductivity%22">Electric conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+analysis%22">Electrochemical analysis</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Carbon-based bipolar plates (BPP) are essential components of the vanadium redox flow battery (VRFB) stack guaranteeing electrical conductivity and physical separation of adjacent cells. They are usually made of composite materials with complex structures containing conductive carbon components and polymer binder materials. In order to investigate their aging by simulation of repetitive charging/discharging conditions in areas with sluggish electrolyte flow, commercially available graphite-polypropylene BPPs were subjected to galvanodynamic treatment under diffusion limitation conditions in a three electrode electrochemical cell with positive electrolyte (VO2+/VO2+) using different states of charge (SOC). The current was swept between 100 and -100 mA/cm². After aging, cyclic voltammetry (CV) in diluted H2SO4 was used to analyze the change in double layer capacitance and redox activity of the BPPs. Morphological investigations of the surface texture and bulk material were performed by means of scanning electron and confocal microscopies as well as by X-ray computed microtomography. After 3000 sweeping cycles in the positive electrolyte at high SOC the BPP showed an increase in double layer capacitance as well as higher roughness and increase in open pore volume in depths up to 100 μm. The aging effects are ascribed to oxidation and corrosion of the surface. [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: BibEntity: Identifiers: – Type: doi Value: 10.1149/2.1261712jes Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: A2566 Subjects: – SubjectFull: Vanadium redox battery Type: general – SubjectFull: Electric conductivity Type: general – SubjectFull: Electrochemical analysis Type: general Titles: – TitleFull: Bulk Aging of Graphite-Polypropylene Current Collectors Induced by Electrochemical Cycling in the Positive Electrolyte of Vanadium Redox Flow Batteries. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Satola, Barbara – PersonEntity: Name: NameFull: Komsiyska, Lidiya – PersonEntity: Name: NameFull: Wittstock, Gunther IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: 2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 00134651 Numbering: – Type: volume Value: 164 – Type: issue Value: 12 Titles: – TitleFull: Journal of The Electrochemical Society Type: main |
| ResultId | 1 |
