Evaluation of Electrochemical Behavior of CuCl2 in Absences/Presences of 3-(2-(4-aminobenzoyl) hydrazono)-N-(pyridin-2-yl) butanamide: Cyclic Voltammetric and Tafel Slopes Evaluation

The electrochemical behavior of CuCl₂ in a 0.1 M KCl solution was investigated using cyclic voltammetry, employing a conventional glassy carbon electrode in conjunction with an Ag/AgCl reference electrode. At nearby (1.0 -1.5)V, two prominent reduction and two oxidation peaks were recognized. Upon increasing the concentrations of CuCl₂, both the cathodic and oxidation waves were greater than before, indicating a direct correlation between cupric chloride concentration and the observed electrochemical responses. The recorded peaks signify the transition from divalent to monovalent copper ions, occurring within the reduction process. Conversely, during the oxidation process, the reverse oxidation occurs, converting the monovalent copper ions back to their divalent state. Subsequently, the solvation thermodynamic properties were evaluated and discussed. Additionally, the complexation reaction between CuCl₂ and 3-(2-(4-aminobenzoyl) hydrazono)-N-(pyridin-2-yl) butanamide (H₂ABHPB) ligand, was studied. The Gibbs free energies associated with the interaction of CuCl2 with the employed ligand (H₂ABHPB) were determined and found to be within 48 to 50.8 kJ/mol range, proving strong interaction. Subsequent, analysis involved the estimation of Tafel slopes for the electrochemical in absence/presence ligand H₂ABHPB were studied. This investigation revealed the coexistence of diffusion-controlled electron transfer and mass transfer mechanisms. Furthermore, the Tafel equation parameters were scrutinized to gain insights into the underlying electrochemical processes