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Effect of pre-annealing on chemical configuration and heteroatom doping of highly active carbon catalysts for the oxygen reduction reaction.

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Title: Effect of pre-annealing on chemical configuration and heteroatom doping of highly active carbon catalysts for the oxygen reduction reaction.
Authors: Lee, Hae Ri1 (AUTHOR), Han, Seunggyun1 (AUTHOR), Lee, Jong Yoon2 (AUTHOR), Lee, Gwanwon1,3 (AUTHOR), Lee, Sungho3,4 (AUTHOR), Joh, Han-Ik1 (AUTHOR) hijoh@konkuk.ac.kr
Source: Journal of Industrial & Engineering Chemistry. Dec2023, Vol. 128, p542-549. 8p.
Subjects: Platinum group catalysts, Oxygen reduction, Catalysts, Catalytic activity, Nitrogen, Boron isotopes, Carbonyl group, Platinum catalysts
Abstract: [Display omitted] Heteroatom-doped carbon catalysts are promising alternatives to platinum group metal-free catalysts for oxygen reduction reaction (ORR). To enhance the ORR activity of carbon-based catalysts, the break of electroneutrality and number of active sites must be maximized. In this study, an annealing process at a mild temperature was introduced before heteroatom doping to control the content and configuration of the oxygen functional groups on the graphene oxide (GO). Pre-annealing affects the chemical configuration and the porosity of GO such that the epoxy groups are converted into carbonyl groups accompanying the defect formation. Interestingly, The carbonyl-enriched environment allowed ammonia borane, as a dopant with nitrogen and boron atoms, the enhanced doping performance, inducing the formation of higher number of heteroatom doping sites and additional defects in the graphene lattice. The aBNG-150 catalyst demonstrated outstanding ORR activity in both half- and single-cell evaluations because it had the highest heteroatom content and meso/macropores derived from the elimination of oxygen functional groups, which can facilitate ORR catalytic activity and O 2 diffusion pathway. Therefore, we believe that this approach provides an effective route for synthesizing carbon-based catalysts with remarkable ORR performances. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Industrial & Engineering Chemistry 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: 173700050
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PubTypeId: serialPeriodical
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  Data: Effect of pre-annealing on chemical configuration and heteroatom doping of highly active carbon catalysts for the oxygen reduction reaction.
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  Data: <searchLink fieldCode="AR" term="%22Lee%2C+Hae+Ri%22">Lee, Hae Ri</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Han%2C+Seunggyun%22">Han, Seunggyun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Jong+Yoon%22">Lee, Jong Yoon</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Gwanwon%22">Lee, Gwanwon</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Sungho%22">Lee, Sungho</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Joh%2C+Han-Ik%22">Joh, Han-Ik</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hijoh@konkuk.ac.kr</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Industrial+%26+Engineering+Chemistry%22">Journal of Industrial & Engineering Chemistry</searchLink>. Dec2023, Vol. 128, p542-549. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Platinum+group+catalysts%22">Platinum group catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Oxygen+reduction%22">Oxygen reduction</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Catalytic+activity%22">Catalytic activity</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen%22">Nitrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Boron+isotopes%22">Boron isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonyl+group%22">Carbonyl group</searchLink><br /><searchLink fieldCode="DE" term="%22Platinum+catalysts%22">Platinum catalysts</searchLink>
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  Label: Abstract
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  Data: [Display omitted] Heteroatom-doped carbon catalysts are promising alternatives to platinum group metal-free catalysts for oxygen reduction reaction (ORR). To enhance the ORR activity of carbon-based catalysts, the break of electroneutrality and number of active sites must be maximized. In this study, an annealing process at a mild temperature was introduced before heteroatom doping to control the content and configuration of the oxygen functional groups on the graphene oxide (GO). Pre-annealing affects the chemical configuration and the porosity of GO such that the epoxy groups are converted into carbonyl groups accompanying the defect formation. Interestingly, The carbonyl-enriched environment allowed ammonia borane, as a dopant with nitrogen and boron atoms, the enhanced doping performance, inducing the formation of higher number of heteroatom doping sites and additional defects in the graphene lattice. The aBNG-150 catalyst demonstrated outstanding ORR activity in both half- and single-cell evaluations because it had the highest heteroatom content and meso/macropores derived from the elimination of oxygen functional groups, which can facilitate ORR catalytic activity and O 2 diffusion pathway. Therefore, we believe that this approach provides an effective route for synthesizing carbon-based catalysts with remarkable ORR performances. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Industrial & Engineering Chemistry 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:
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      – Type: doi
        Value: 10.1016/j.jiec.2023.08.019
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 542
    Subjects:
      – SubjectFull: Platinum group catalysts
        Type: general
      – SubjectFull: Oxygen reduction
        Type: general
      – SubjectFull: Catalysts
        Type: general
      – SubjectFull: Catalytic activity
        Type: general
      – SubjectFull: Nitrogen
        Type: general
      – SubjectFull: Boron isotopes
        Type: general
      – SubjectFull: Carbonyl group
        Type: general
      – SubjectFull: Platinum catalysts
        Type: general
    Titles:
      – TitleFull: Effect of pre-annealing on chemical configuration and heteroatom doping of highly active carbon catalysts for the oxygen reduction reaction.
        Type: main
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            NameFull: Lee, Hae Ri
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            NameFull: Han, Seunggyun
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            NameFull: Lee, Jong Yoon
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            NameFull: Lee, Gwanwon
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            NameFull: Lee, Sungho
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            NameFull: Joh, Han-Ik
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            – D: 25
              M: 12
              Text: Dec2023
              Type: published
              Y: 2023
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              Value: 128
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            – TitleFull: Journal of Industrial & Engineering Chemistry
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