Where does no metal loss occur in an electrochemical cell?

The cathode in an electrochemical cell is where reduction reactions take place. During these reactions, electrons are gained, leading to a decrease in oxidation states of the species involved. Since metal ions typically gain electrons at this point, there is no metal loss associated with the cathode.

In contrast, at the anode, oxidation occurs, resulting in the loss of electrons and often the dissolution of metal atoms into the electrolyte solution. This is where metal loss is seen, as the anode material is consumed during the reaction. The electrolyte interface serves as the medium for ion exchange and is integral to the reactions taking place, but it is not a site of metal loss itself. Throughout the cell, while reactions are ongoing, there are areas with metal loss, particularly at the anode, making the statement about no metal loss at the cathode accurate and aligned with the principles of electrochemistry.