Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 109, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2019.106566
Keywords
Mass transport impedance; Cylindrical diffusion; Carbon fiber; Microelectrode; EIS
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Funding
- Natural Sciences and Engineering Council of Canada [RGPIN-2017-04045]
- University of Canterbury
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The theoretical mass-transport impedance at cylindrical microelectrodes has been known for some time, but an experimental verification is given here for the first time, using carbon fiber electrodes taken from a commercial carbon felt. Nonlinear least-squares fitting of the impedance spectrum of a redox couple at the reversible potential enables accurate evaluation of a composite parameter containing the standard rate constant and mean diffusivity, without measuring the fiber diameter, length or area.
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