Based on a more detailed evaluation of the charges passed in both scan directions during potential cycling, we can conclude that possible surface ad-/desorption processes involving a charge transfer occur concomitantly with other electrochemical reactions.[Ref-ChemRXiv] Thus, impurities deposited on the electrode can indeed act as catalytic sites for the conversion of species in the solution or act as a poison, changing the surface properties as well as reducing the catalytic activity of the substrate towards the reaction with species in the solution.