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This article presents the implementation of on-chip iontronic circuits viasmall-scale integration of multiple ionic logic gates made of bi-polarpolyelectrolyte diodes. These ionic circuits are analogous to solid-stateelectronic circuits, with ions as the charge carriers instead ofelectrons/holes. We experimentally characterize the responses of a singlefluidic diode made of a junction of oppositely charged polyelectrolytes (i.e.,anion and cation exchange membranes), with a similar underlying mechanism as asolid-state p- and n-type junction. This served to carry out pre-designedlogical computations in various architectures by integrating multiplediode-based logic gates, where the electrical signal between the integratedgates was transmitted entirely through ions. The findings shed light on thelimitations affecting the number of logic gates that can be integrated, thedegradation of the electrical signal, their transient response, and the designrules that can improve the performance of iontronic circuits.

Designing with Iontronic Logic Gates -- From a Single Polyelectrolyte Diode to Small Scale Integration