View in EDS

Electrocatalytic kinetics and mechanistic insights into indole oxidation reaction on highly oriented pyrolytic graphite electrodes.

Saved in:
Bibliographic Details
Title: Electrocatalytic kinetics and mechanistic insights into indole oxidation reaction on highly oriented pyrolytic graphite electrodes.
Authors: Rojas, Mariana I.1,2 (AUTHOR) mrojas@unc.edu.ar, Gomez, Cesar G.3 (AUTHOR), Avalle, Lucía B.4 (AUTHOR), Pérez, Omar E. Linarez2,5 (AUTHOR) olinarez@unc.edu.ar
Source: Journal of Solid State Electrochemistry. Nov2025, Vol. 29 Issue 11, p4721-4733. 13p.
Subjects: Electrocatalysis kinetics, Pyrolytic graphite, Impedance spectroscopy, Electrocatalysts, Electrochemical experiments, Chemical kinetics, Current density (Electromagnetism), Electrode reactions
Abstract: The kinetics and mechanism of the indole oxidation reaction (IOR) on a highly oriented pyrolytic graphite (HOPG) electrode were investigated using various electrochemical techniques. The HOPG electrode exhibited excellent electrocatalytic activity, reaching current densities of up to 35 µA/cm2 over a concentration range of 0.1 and 200.0 µM and a detection limit of 0.02 µM. Chronoamperometric transients were analyzed through a kinetic model that described the relationship between the observed current density and the distribution of free and occupied active sites on the electrode surface. The number of active sites was quantified, revealing a moderate turnover frequency (TOF) under non-saturating conditions, showing the efficiency of the electrode during IOR. Electrochemical impedance spectroscopy (EIS) was employed to characterize the electrode surface and electrode/electrolyte interface. The EIS spectra, fitted using an equivalent circuit model, allowed the evaluation of charge transfer resistance and effective capacitance as a function of indole concentration. This study highlights the technological importance of understanding IOR, especially in the development of sensors for clinical and environmental applications requiring precise detection and quantification of indole. Highlights: • Electrochemical investigation of the indole oxidation reaction (IOR) on highly oriented pyrolytic graphite (HOPG). • High electrocatalytic activity with a low detection limit and wide concentration range. • A kinetic model linking current density to occupation and vacancy dynamics of active sites, providing insights into the reaction mechanism and kinetics. • Quantification of active sites involved in the IOR and the turnover frequency (TOF) under non-saturating conditions. • Electrochemical characterization of the electrode surface, electrode/electrolyte interface, and IOR parameters as functions of the analyte concentration. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Solid State Electrochemistry is the property of Springer Nature 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
Header DbId: egs
DbLabel: Engineering Source
An: 188626763
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Electrocatalytic kinetics and mechanistic insights into indole oxidation reaction on highly oriented pyrolytic graphite electrodes.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Rojas%2C+Mariana+I%2E%22">Rojas, Mariana I.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> mrojas@unc.edu.ar</i><br /><searchLink fieldCode="AR" term="%22Gomez%2C+Cesar+G%2E%22">Gomez, Cesar G.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Avalle%2C+Lucía+B%2E%22">Avalle, Lucía B.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pérez%2C+Omar+E%2E+Linarez%22">Pérez, Omar E. Linarez</searchLink><relatesTo>2,5</relatesTo> (AUTHOR)<i> olinarez@unc.edu.ar</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Journal+of+Solid+State+Electrochemistry%22">Journal of Solid State Electrochemistry</searchLink>. Nov2025, Vol. 29 Issue 11, p4721-4733. 13p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Electrocatalysis+kinetics%22">Electrocatalysis kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Pyrolytic+graphite%22">Pyrolytic graphite</searchLink><br /><searchLink fieldCode="DE" term="%22Impedance+spectroscopy%22">Impedance spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Electrocatalysts%22">Electrocatalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+experiments%22">Electrochemical experiments</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Current+density+%28Electromagnetism%29%22">Current density (Electromagnetism)</searchLink><br /><searchLink fieldCode="DE" term="%22Electrode+reactions%22">Electrode reactions</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The kinetics and mechanism of the indole oxidation reaction (IOR) on a highly oriented pyrolytic graphite (HOPG) electrode were investigated using various electrochemical techniques. The HOPG electrode exhibited excellent electrocatalytic activity, reaching current densities of up to 35 µA/cm2 over a concentration range of 0.1 and 200.0 µM and a detection limit of 0.02 µM. Chronoamperometric transients were analyzed through a kinetic model that described the relationship between the observed current density and the distribution of free and occupied active sites on the electrode surface. The number of active sites was quantified, revealing a moderate turnover frequency (TOF) under non-saturating conditions, showing the efficiency of the electrode during IOR. Electrochemical impedance spectroscopy (EIS) was employed to characterize the electrode surface and electrode/electrolyte interface. The EIS spectra, fitted using an equivalent circuit model, allowed the evaluation of charge transfer resistance and effective capacitance as a function of indole concentration. This study highlights the technological importance of understanding IOR, especially in the development of sensors for clinical and environmental applications requiring precise detection and quantification of indole. Highlights: • Electrochemical investigation of the indole oxidation reaction (IOR) on highly oriented pyrolytic graphite (HOPG). • High electrocatalytic activity with a low detection limit and wide concentration range. • A kinetic model linking current density to occupation and vacancy dynamics of active sites, providing insights into the reaction mechanism and kinetics. • Quantification of active sites involved in the IOR and the turnover frequency (TOF) under non-saturating conditions. • Electrochemical characterization of the electrode surface, electrode/electrolyte interface, and IOR parameters as functions of the analyte concentration. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Solid State Electrochemistry is the property of Springer Nature 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=188626763
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s10008-025-06339-5
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 4721
    Subjects:
      – SubjectFull: Electrocatalysis kinetics
        Type: general
      – SubjectFull: Pyrolytic graphite
        Type: general
      – SubjectFull: Impedance spectroscopy
        Type: general
      – SubjectFull: Electrocatalysts
        Type: general
      – SubjectFull: Electrochemical experiments
        Type: general
      – SubjectFull: Chemical kinetics
        Type: general
      – SubjectFull: Current density (Electromagnetism)
        Type: general
      – SubjectFull: Electrode reactions
        Type: general
    Titles:
      – TitleFull: Electrocatalytic kinetics and mechanistic insights into indole oxidation reaction on highly oriented pyrolytic graphite electrodes.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Rojas, Mariana I.
      – PersonEntity:
          Name:
            NameFull: Gomez, Cesar G.
      – PersonEntity:
          Name:
            NameFull: Avalle, Lucía B.
      – PersonEntity:
          Name:
            NameFull: Pérez, Omar E. Linarez
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
          Identifiers:
            – Type: issn-print
              Value: 14328488
          Numbering:
            – Type: volume
              Value: 29
            – Type: issue
              Value: 11
          Titles:
            – TitleFull: Journal of Solid State Electrochemistry
              Type: main
ResultId 1