Stochastic resonance in electron transfer oscillations of extended viologen

TitleStochastic resonance in electron transfer oscillations of extended viologen
Publication TypeJournal Article
Year of Publication2014
AuthorsHromadová, M, Valášek, M, Fanelli, N, Randriamahazaka, HN, Pospíšil, L
JournalJournal of Physical Chemistry C
ISSN19327447 (ISSN)
KeywordsCircuit resonance, Current oscillation, Electrochemical currents, Electrochemical oscillators, Electron transitions, Harmonic analysis, Heterogeneous electron transfer, Magnetic resonance, Oscillating reactions, Selective generation, Small perturbations, Stochastic resonances

Selective generation of only odd harmonics and the absence of even harmonics were never described for electrochemical oscillators though this phenomenon is known in special fields of physics and in biological systems. The heterogeneous electron transfer to the extended viologen with four repetitive viologen units yields electrochemical current oscillations. Small perturbation of the applied voltage by only a few millivolts sine wave results in current oscillations, which selectively enhance only the odd harmonic higher frequencies. The effect is explained in terms of the theory of stochastic resonance occurring in driven oscillating reactions. The described interplay of heterogeneous and homogeneous coupled electron transfers complies with the behavior of a nonlinear potential-symmetric system. © 2014 American Chemical Society.