Adsorption of anions on ultra-thin metal deposits on single crystal electrodes

摘要: Abstract The formation of submonolayer coverages cadmium on Pt(111) and polycrystalline Pt electrodes has been characterized using cyclic voltammetry, adsorption bisulphate the Cd-covered surfaces measured by radioactive labelling. Cyclic voltammograms platinum (111) in Cd 2+ containing solutions have compared. differ with respect to current-potential peak symmetries which shows that deposition reversibility depends surface crystallographic orientation platinum. Assuming a total discharge takes place, charge potential range studied would indicate no more than half monolayer is formed Pt(111). On contrary, if incomplete full formed, apparent electrosorption valency 0.8. However, labelling data some well-resolved adatom structures are inactive while very active toward anion adsorption. We conclude deposits oxidized present either oxide or hydroxide form. Therefore, at this stage research, coulometric determination valencies merely formal. Once part transformed metal phase, begins conforms well-known behaviour categorized as enhanced underpotentially deposited ultra-thin films foreign substrates.