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A theoretical model validation with an evaluation of the kinetic parameters for variations in the bulk concentration in an E’ reaction with quasi-reversible reduction in a high concentration electrolyte is still desirable. A transient current approach was developed using a collocation model to validate the variations of the [Co(II)(CN)5] 3(Co(II)) reduction current using a rotating disc electrode (RDE) during [Co(I)(CN)5] 4(Co(I)) concentration variations in a bulk solution by flow electrolysis. The experimentally observed transient currents, at either different rotation speeds or temperatures, were well matched, highlighting the suitability of the developed transient model. The kinetic parameters, such as the transfer coefficient (α), diffusion layer thickness (), heterogeneous electron transfer (ks), mass transfer coefficient in the form of dynamic diffusivity (D), and energy of activation (Ea), were derived for the Co(II) reduction at the high concentrated electrolyte. The heterogeneous electron transfer region identified showed that Co(II) reduction follows quasi-reversible reduction in high concentration electrolyte media.

international journal of electrochemical science

The Kinetic Parameters Derived Based on Transient Current Changes in Paired Electrolysis at Rotating Disc Electrode for an E’ Reaction in a Highly Concentrated Electrolyte