Voltammetric characterization of copper and aluminum behavior in concentrated aqueous solutions of phosphoric acid

Voltammetric characterization of Copper and Aluminum behavior in concentrated aqueous solutions of phosphoric acid was performed using the rotating disc electrode (RDE) technique. The linear sweep and cyclic voltammetry (LSV and, respectively, CV) of copper and aluminum in concentrated aqueous solutions of phosphoric acid were presented. The measured limiting current densities were subjected to Levich analyses, demonstrating that water and, respectively, phosphate ions are the acceptor species involved in the rate-determining step of copper and, respectively, aluminum dissolution in concentrated aqueous solutions of phosphoric acid. Also, apparent standard heterogeneous rate constants (k(n)(a)) and charge transfer coefficients (alpha(a)) corresponding to copper and aluminum dissolution in phosphoric acid electrolytes were determined.