Modelling electrochemical modulation of ion release in thin-layer samples

In this work, we present a model based on the finite element approach to describe electrochemically controlled release of ions from redox-active film into sample confined thin-layer spatial domain. The includes effect interfacial charge transfer kinetics and 1D-diffusion treatment for an electron transfer-ion (ET–IT) coupled reaction. More in detail, oxidation (ET) involves ion aqueous phase (IT). dynamic concentration released is calculated when ET–IT reaction proceeds under potentiostatic control, thickness each (i.e., or aqueous) diffusion profile analyzed. experimentally validated particular case which thin polyaniline (PANI, 10 μm thickness) linked protons electrolyte solution. proton produces certain pH changes that are monitored by sensor located at 330 PANI film. associated with related through pH-coulograms agree theoretical predictions. Overall, can reproduce general behavior experimental pump provides key insights functioning mechanism electrochemical systems where redox reactions coupled.