Abstract

This study examines the synthesis and characterization of the Prussian Blue analogue Manganese Hexacyanochromate (MnHCCr) on glassy carbon electrodes. Immobilization was achieved via electrochemical deposition from a stable colloidal suspension using cyclic voltammetry or chronoamperometry. Characterization through SEM, AFM, and XRD confirmed the formation of homogeneous coatings with a cubic crystal structure. Electrochemical analysis revealed four distinct redox processes associated with the Mn2+/Mn3+ and Cr3+/Cr2+ metal centers. The linear relationship between peak current (i(p)) and the square root of the scan rate (v(1/2)) indicates a diffusion-controlled process, allowing for the determination of the diffusion coefficient (D-0) for electrolyte alkali ions. Furthermore, electron transfer kinetics (k degrees) demonstrated that smaller ionic radii (e.g., Li+) result in faster transfer rates (Li+ > Na+ > K+ > NH4+) due to lower energy rearrangement and favorable solvent interactions. These results validate this deposition method as a robust technique for creating functionalized surfaces, offering significant potential for applications in electrocatalysis and the development of high-precision chemical sensors.