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Kinetic relevancy of surface defects and heteroatom functionalities of carbon electrodes for the vanadium redox reactions in flow batteries.

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Title: Kinetic relevancy of surface defects and heteroatom functionalities of carbon electrodes for the vanadium redox reactions in flow batteries.
Authors: Kim, Hyebin1 (AUTHOR), Paick, Jihun1 (AUTHOR), Yi, Jung S.2 (AUTHOR), Lee, Doohwan1 (AUTHOR) dolee@uos.ac.kr
Source: Journal of Power Sources. Feb2023, Vol. 557, pN.PAG-N.PAG. 1p.
Subjects: Carbon electrodes, Surface defects, Flow batteries, Vanadium redox battery, Vanadium, Oxidation-reduction reaction, Oxygen reduction
Abstract: Heteroatom doping of carbon electrodes is an extensively practiced approach to enhance electrokinetics of vanadium redox reactions in flow batteries, because the doped heteroatom functionalities are conventionally considered as the catalytic active sites. In this study, we conducted p type (boron), n type (nitrogen or oxygen), and p-n type (boron and nitrogen) heteroatom doping on graphite felt electrodes, and thoroughly studied their intrinsic electrokinetic effects by collective and quantitative structure-property correlation analysis. The studies reveal that the apparent kinetic enhancements observed by the p type and the n type heteroatom doping are primarily due to the surface lattice defects on carbon electrodes rather than the furnished heteroatom functionalities. Markedly, however, the B and N co-doping give rise to exceptional enhancements in the intrinsic vanadium redox kinetics, both for the VO2+/VO 2 + and V2+/V3+ redox reactions, with 2–4 fold greater electrocatalytic activities than those predicted by the increase of electrochemical surface area by the surface lattice defects. Consequently, the p-n type B and N co-doped GF electrodes offers significant enhancements in the efficiency and energy storage capacity of the vanadium redox flow battery that cannot be achieved by the p type (B) or the n type (N and O) heteroatom doping. • Various heteroatoms are doped on carbon electrodes for redox flow battery. • The surface defects introduced on carbon electrodes are quantified. • The surface defects are the critical active sites for the vanadium redox reactions. • The B and N co-doped electrodes exhibit significantly high electrocatalytic activity. [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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DbLabel: Engineering Source
An: 161140934
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Kinetic relevancy of surface defects and heteroatom functionalities of carbon electrodes for the vanadium redox reactions in flow batteries.
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  Data: <searchLink fieldCode="AR" term="%22Kim%2C+Hyebin%22">Kim, Hyebin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Paick%2C+Jihun%22">Paick, Jihun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yi%2C+Jung+S%2E%22">Yi, Jung S.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<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>. Feb2023, Vol. 557, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Carbon+electrodes%22">Carbon electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+defects%22">Surface defects</searchLink><br /><searchLink fieldCode="DE" term="%22Flow+batteries%22">Flow batteries</searchLink><br /><searchLink fieldCode="DE" term="%22Vanadium+redox+battery%22">Vanadium redox battery</searchLink><br /><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="%22Oxygen+reduction%22">Oxygen reduction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Heteroatom doping of carbon electrodes is an extensively practiced approach to enhance electrokinetics of vanadium redox reactions in flow batteries, because the doped heteroatom functionalities are conventionally considered as the catalytic active sites. In this study, we conducted p type (boron), n type (nitrogen or oxygen), and p-n type (boron and nitrogen) heteroatom doping on graphite felt electrodes, and thoroughly studied their intrinsic electrokinetic effects by collective and quantitative structure-property correlation analysis. The studies reveal that the apparent kinetic enhancements observed by the p type and the n type heteroatom doping are primarily due to the surface lattice defects on carbon electrodes rather than the furnished heteroatom functionalities. Markedly, however, the B and N co-doping give rise to exceptional enhancements in the intrinsic vanadium redox kinetics, both for the VO2+/VO 2 + and V2+/V3+ redox reactions, with 2–4 fold greater electrocatalytic activities than those predicted by the increase of electrochemical surface area by the surface lattice defects. Consequently, the p-n type B and N co-doped GF electrodes offers significant enhancements in the efficiency and energy storage capacity of the vanadium redox flow battery that cannot be achieved by the p type (B) or the n type (N and O) heteroatom doping. • Various heteroatoms are doped on carbon electrodes for redox flow battery. • The surface defects introduced on carbon electrodes are quantified. • The surface defects are the critical active sites for the vanadium redox reactions. • The B and N co-doped electrodes exhibit significantly high electrocatalytic activity. [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.2022.232612
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Carbon electrodes
        Type: general
      – SubjectFull: Surface defects
        Type: general
      – SubjectFull: Flow batteries
        Type: general
      – SubjectFull: Vanadium redox battery
        Type: general
      – SubjectFull: Vanadium
        Type: general
      – SubjectFull: Oxidation-reduction reaction
        Type: general
      – SubjectFull: Oxygen reduction
        Type: general
    Titles:
      – TitleFull: Kinetic relevancy of surface defects and heteroatom functionalities of carbon electrodes for the vanadium redox reactions in flow batteries.
        Type: main
  BibRelationships:
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      – PersonEntity:
          Name:
            NameFull: Kim, Hyebin
      – PersonEntity:
          Name:
            NameFull: Paick, Jihun
      – PersonEntity:
          Name:
            NameFull: Yi, Jung S.
      – PersonEntity:
          Name:
            NameFull: Lee, Doohwan
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          Dates:
            – D: 15
              M: 02
              Text: Feb2023
              Type: published
              Y: 2023
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              Value: 03787753
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            – Type: volume
              Value: 557
          Titles:
            – TitleFull: Journal of Power Sources
              Type: main
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