From the in situ FTIR spectroscopy of the electrode/electrolyte solution interface at pH values of 1.2, 2.0, and 3.4, it can be confirmed that the adsorbate associated with the anomalous peaks in the cyclic voltammetry of Pt(111) in sulfate- and bisulfate-containing solutions is not the sulfate anion. The structure of the bisulfate-like adsorbate is tentatively postulated to be a sulfate ion/hydronium ion ion pair: SO 4 2- ·H 3 O + . Over the potentials in question, and only in solutions with appreciable HSO 4 - concentration, can IR bands be found that are associated with the adsorbed species.
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Faguy et al. (1996) studied this question.
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