Publication date: 15th December 2025
The oxidation of organic molecules by electrochemical processes is presented as an
alternative to oxygen evolution in electrochemical processes, such as hydrogen
production and reduction.
Under certain conditions, after the onset of the oxidation reaction of organic molecules
a negative resistance is observed in impedance spectroscopy measurements. This
phenomena that is named negative differential resistance (NDR) is found when the
current-voltage curve presents negative slope and is found in electronic components
used in high frecuency oscillators, amplifiers memories and neuromorphic computing.
[1].
In this work we explore the origin of NDR in the oxidation reaction of glycerol over nickel
foil in alkaline conditions. The impedance measurements also show the presence of a
low frecuency inductance accompanying this effect, what suggest that absorption of
glycerol or its intermediates in the reactions is playing a role in this phenomena. [2,3].
In the Nyquist plot, the presence of negative differential resistance (NDR) is clearly
observed at 0.52 V vs Ag/AgCl, accompanied by an inductive loop at low frequencies.
The potential at which this is observed coincides with the peak in the J–V curve.
Fig 1 Left. J-V Curve of Ni foil in electrolyte with and without glycerol showing. Negative slope
is causing negative differential. Resistance is observed when glycerol is present. Right Nyquist
of Ni foil in 25 mM glycerol solution at 0.52V vs Ag/AgCl.
ACKNOWLEDGMENTS:
We thank financial support by Ministerio de Ciencia e Innovación
y Universidades of Spain (MICIU) project ADD PID2023- 1491580B-C41.
References:
[1] R, B. P. (2011). Negative Differential Resistance Devices and Circuits. In
Comprehensive Semiconductor Science and Technology (Vol. 5).
http://www.elsevier.com/locate/permissionusematerial.
[2] Alvarez, A.O., Arcas, R., Aranda, C. A., Mas-Marzá, E., Saliba, M., Fabregat-Santiago, F.
J.Phys.Chem.Lett.(2020) 11, 8417−8423.
https://dx.doi.org/10.1021/acs.jpclett.0c02331
[3] Bisquert, J., & Guerrero, A. (2022). Chemical Inductor. Journal of the American
Chemical Society, 144(13), 5996–6009. https://doi.org/10.1021/jacs.2c00777
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