The underpotential deposition(UPD)of metallic ions on foreign substrates is one of the more investigated subjects in electrochemistry due to its importance in several technological applications.First cycle voltammetry is the most used electrochemical technique to study UPD since it is able to detect fractions of monolayers adsorbed on the electrode.However,this technique fails in the determination of non-electroactive species such as anions co-adsorbed with ad-atoms.To overcome this limitation,the electrochemical quartz crystal microbalance(EQCM)is an interesting possibility.The simultaneous determination of charge and mass variations during the electrode process allows accounting for the species that are not active for electron transfer.
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