The oscillatory response of the potential was monitored in two electrochemical reactions carried out under galvanostatic conditions. In the oxidation of formaldehyde, incrementing the current generated a sequence of temporal states consisting of alternating intervals of periodic and chaotic behaviors. A sequence of periodic states, which obeys Farey addition, was found in the oxidation of formate/formic acid. The temporal states in both reactions consisted of different combinations of small and large oscillations. The observation of these mixed oscillations implies that the kinetic mechanisms contain at least two coupled instabilities.
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