Nanoscale engineering to control mass transfer on carbon-based electrodes

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-07
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
Series
Electrochemistry Communications, Volume 140
Abstract
Here we use an electrode consisting of carbon nanofibers (CNFs), the lengths and surface population density of which can be effectively controlled. It is shown that (i) a thin liquid layer forms when the thickness of the diffusion layer has a specific ratio to the dimensions of the nanostructured carbon surface. (ii) This leads to a decrease in the peak potential difference and a subsequent increase in the apparent heterogeneous electron transfer (HET) constant, both of which could be interpreted as a result of increased catalytic activity. (iii) However, we show that this explanation is not likely, as our materials are chemically identical, and we use an outer sphere redox (OSR) probe to minimize any specific chemical interactions. On the contrary, (iv) the results clearly show that the observed behavior is caused by a combination of the formation of a thin liquid layer and the increased apparent surface area of the electrodes.
Description
Publisher Copyright: © 2022 The Author(s)
Keywords
Carbon nanomaterials, Nanofibers, Outer-sphere redox probe, Thin-layer diffusion
Other note
Citation
Pascual, L F, Pande, I, Kousar, A, Rantataro, S & Laurila, T 2022, ' Nanoscale engineering to control mass transfer on carbon-based electrodes ', Electrochemistry Communications, vol. 140, 107328 . https://doi.org/10.1016/j.elecom.2022.107328