Mass Transport Properties and Influence of Natural Convection for Voltammetry at the Agarose Hydrogel Interface

Byung Kwon Kim, Kyungsoon Park

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Agarose hydrogel, a solid electrolyte, was investigated voltammetrically in terms of transport properties and natural convection effects using a ferrocenyl compound as a redox probe. To confirm the diffusion properties of solute on the agarose interface, the diffusion coefficients (D) of ferrocenemethanol in agarose hydrogel were determined by cyclic voltammetry (CV) according to the concentration of agarose hydrogel. While the value of D on the agarose interface is smaller than that in the bulk solution, the square root of the scan rate-dependent peak current reveals that the mass transport behavior of the solute on the agarose surface shows negligible convection or migration effects. In order to confirm the reduced natural convection on the gel interface, scan rate-dependent CV was performed in the solution phase and on the agarose surface, respectively. Slow scan voltammetry at the gel interface can determine a conventional and reproducible diffusion-controlled current down to a scan rate of 0.3 mV/s without any complicated equipment.

Original languageEnglish
Pages (from-to)347-353
Number of pages7
JournalJournal of Electrochemical Science and Technology
Volume13
Issue number3
DOIs
StatePublished - Aug 2022

Bibliographical note

Funding Information:
K.P. acknowledges the support from Basic Science Research Program to Research Institute for Basic Sciences (RIBS) of Jeju National University through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2019R1A6A1A 10072987). B.K. was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2021R1A6A1A10039823) and by the National Research Foundation (NRF) of Korea, which is funded by the Ministry of Science and ICT (NRF-2021R1A2C4002069). This work was supported by the Ewha Womans University Research Grant of 2021.

Publisher Copyright:
© 2022, Korean Electrochemical Society. All rights reserved.

Keywords

  • Agarose
  • Diffusion coefficient
  • Hydrogel
  • Natural convection
  • Slow scan voltammetry

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