Overlap of the oxide and hydrogen regions of platinum electrodes in aqueous acid solution |
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Authors: | Declan L Burke Andrea J Ahern |
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Institution: | (1) Chemistry Department, University College Cork, Cork, Ireland, |
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Abstract: | Two unusual features of noble metal electrode surfaces, active states of the metal and their anodic oxidation products (hydrous
oxides), are of increasing interest at the present time owing to the important role of such species in electrocatalysis. The
extent to which the hydrous oxide reduction process overlaps with the hydrogen adsorption region was investigated for platinum
in acid solution. At least three distinct hydrous oxide reduction peaks (or regions) were observed and in some cases one of
these peaks commenced at ca. 0.0 V, i.e. it was almost totally within the hydrogen gas evolution region. Following repeated
hydrous oxide growth and reduction, which disrupted and thus activated the metal surface, a sequence of four low-level premonolayer
oxidation peaks (each of which has been noted earlier by other authors) appeared in the positive sweep. As discussed earlier
for copper in base, the transitions giving rise to such peaks are assumed to be mediator generation reactions, which strongly
influence electrocatalytic processes occurring on platinum at low potentials.
Electronic Publication |
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Keywords: | Platinum Hydrous oxide Surface activation Anomalous behaviour |
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