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Microsoft Excel: Finding Central Tendency, Skew, and Kurtosis01:24

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Taffit: An Excel Tool for Fitting Tafel Data.

Joshua Coduto1, Johna Leddy1

  • 1Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States.

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|August 27, 2025
PubMed
Summary
This summary is machine-generated.

Classical Tafel analysis (CTA) is subjective. A new algorithm, Taffit, provides user-independent Tafel analysis for accurate electrode kinetic characterization, improving electrocatalyst comparison.

Keywords:
HER on glassy carbon electrodeTafel analysisTafel plotTafel slopeTaffitelectrocatalystsexchange current density

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis Research

Background:

  • Tafel analysis is crucial for characterizing electrode kinetics in electrochemistry, catalysis, materials, and corrosion research.
  • Classical Tafel analysis (CTA) suffers from user subjectivity in selecting linear ranges, leading to significant variations in kinetic parameters.
  • A need exists for a more reliable and user-independent method for Tafel analysis.

Purpose of the Study:

  • To introduce Taffit, an algorithm for user-independent Tafel analysis.
  • To improve the accuracy and precision of determining electrochemical kinetic parameters.
  • To provide a more objective method for comparing electrocatalysts.

Main Methods:

  • Development of the Taffit algorithm in Microsoft Excel.
  • Generation of Tafel plots from linear sweep voltammetric data.
  • Determination of exchange current density (j0), charge transfer coefficient (α), and Tafel slopes using statistical fitting.

Main Results:

  • Taffit provides user-independent determination of kinetic parameters, reducing variability.
  • Taffit yields log j0 values of -7.2 for GC and -3.9 for Pt in HER at pH 0.
  • Demonstrated agreement between Taffit and CTA for HER on metal phosphide and selenide electrocatalysts.

Conclusions:

  • Taffit significantly reduces subjectivity in Tafel analysis, enhancing accuracy and precision.
  • The algorithm offers a more reliable approach for characterizing electrode kinetics, particularly for electrocatalyst comparisons.
  • Taffit represents a valuable tool for researchers in electrochemistry and related fields.