Insights into electrode-electrolyte adsorption dynamics via double potential step chronocoulometry and cyclic voltammetry

Ayesha Kousar, Tomi Laurila*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The crucial role of analyte adsorption in electrode reaction kinetics underscores the need for advanced methodologies to study the extent and nature of adsorbed molecules on electrode surfaces. In this study, we employed the classical yet underutilized technique of double potential step chronocoulometry (DPSC) to investigate the nature of adsorbed molecules on electrodes. We assessed the extent of adsorption of dopamine (DA) and the products of ascorbic acid (AA) and uric acid (UA) at increasing concentrations on carbon nanofiber (CNF) electrodes via DPSC measurements and compared the results with those obtained from the commonly used cyclic voltammetry (CV). DPSC findings indicated significant adsorption of component ions, specifically phosphate and chloride of phosphate buffer saline (PBS) electrolyte, on the electrode surface. The results presented in the manuscript demonstrate that DPSC can be a reliable technique for studying the specific adsorption in DA sensors, thus providing valuable insights for modifying materials to enhance DA sensor performance.

Original languageEnglish
Article number118374
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume965
DOIs
Publication statusPublished - 15 Jul 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • Adsorption
  • Carbon nanofibers
  • Chronocoulometry
  • Dopamine
  • Electrochemistry

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