Journal of Analytical Science and Technology

2093-3134

(2023) 14:10

SCIE

[논문]Electrochemical study of agarose hydrogels for natural convection on macroelectrodes and ultramicroelectrodes

Jihun Han, Kyungsoon Park

한지훈, 박경순

Sukman Jang, Byung‑Kwon Kim

Electrochemical measurements using an agarose hydrogel as a solid electrolyte and ferrocyanide as a redox probe
were conducted to analyze transport properties and natural convection efects. The mass transport properties and
difusion coefcients of ferrocyanide were studied using various macroelectrodes and ultramicroelectrodes via cyclic
voltammetry. The experimental results confrmed that the mass transfer behavior in agarose was similar to that in
solution. The good linearity of the square root of the scan-rate-dependent peak current demonstrated that difu‑
sion is dominant during mass transfer in agarose hydrogel owing to a reduction in other mass transport efects (i.e.,
migration and convection). Furthermore, chronoamperometry (CA) was performed to estimate the efects of natural
convection in the solution and agarose hydrogel. CA curves and plots of current as a function of the inverse square
root of time yielded irregular and irreproducible responses in the solution for relatively long-term electrochemistry.
However, in the agarose hydrogel, the CA response was more regular and reproducible for >300 s because of reduced
natural convection, based on the Cottrell’s theory.

2023.02.08.

https://doi.org/10.1186/s40543-023-00375-4