Electrochemical Studies of the pH Dependence of Cu(II) Reduction in Aqueous Britton-Robinson Buffer Solution

摘要

The electrochemical reduction of Cu(II) has been studied in aqueous Britton-Robinson (BR) buffermedium with glassy carbon electrode (GCE) at various pH values. It is observed that at low pH valuesCu(II) follows two-step electrochemical reduction while at high pH it undergoes one-step reductionprocess. On the other hand the oxidation of Cu(0)/Cu(II) couple follows one-step oxidation reaction inthe studied pH range. The intensities of both cathodic and anodic peak current are also increased withincreasing scan rate consistent with Randles-Sevcik equation. A linear behavior of peak current versussquare root of scan rate indicates that the electrochemical processes are diffusion controlled.