Publication date: 15th December 2025
The oxidation of organic molecules by electrochemical processes is presented as an
option for oxygen evolution in electrochemical processes, such as hydrogen production
and đ¶đ2 reduction.
The study of negative resistance in electrochemical reactions from an impedance
spectroscopy point of view is not well known. Therefore, electrical impedance
characterization is carried out using a nickel foil as an electrocatalyst.
The impedance was evaluated in the redox peak region of cyclic voltammetry, using
different electrolytes with and without organic molecules, in an alkaline medium. The
J- V curve shows that adding the organic molecule causes a change in slope, which results
in negative resistance in the Nyquist plot.
At the initials at which the measurement is made, the presence of inductance is also
observed in the Nyquist plot, coinciding in some cases with the potential at which
resistance becomes negative. Therefore, this gives rise to the fact that, at this potential,
it is possible related to the adsorption of intermediate species at the electrode-
electrolyte interface.
We thank financial support by Ministerio de Ciencia e Innovación y Universidades of Spain (MICIU) project ADD PID2023- 1491580B-C41.
[3] Lasia, A. Electrochemical Impedance Spectroscopy and its Applications; Springer,
2014.
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