We investigate dynamics and bifurcations in a mathematical model that captures electrochemical experiments on arrays of microelectrodes. In isolation, each individual microelectrode is described by a one-dimensional unit with a bistable current-potential response. When an array of such electrodes is coupled by controlling the total electric current, the common electric potential of all electrodes oscillates in some interval of the current. These coupling-induced collective oscillations of bistable one-dimensional units are captured by the model. Moreover, any equilibrium is contained in a cluster subspace, where the electrodes take at most three distinct states. We systematically analyze the dynamics and bifurcations of the model equations: We consider the dynamics on cluster subspaces of successively increasing dimension and analyze the bifurcations occurring therein. Most importantly, the system exhibits an equivariant transcritical bifurcation of limit cycles. From this bifurcation, several limit cycles branch, one of which is stable for arbitrarily many bistable units.
Bibliographical noteFunding Information:
The authors thank A. Bonnefont for input concerning heterogeneous ensembles. C.B. acknowledges support from the Institute for Advanced Study at the Technical University of Munich through a Hans Fischer fellowship. This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through “e-conversion” Cluster of Excellence (Grant No. EXC 2089/1-390776260).
© 2021 Author(s).