Abstract
Two points are discussed here: (a) the actual value of the capacitance in the potential range where no adsorption of hydrogen or oxygen takes place; (b) the general shape of the capacitance curves in the oxygen-adsorption region. Results in the literature can be explained by taking into account the time elapsing between electrode cleaning and capacitance reading. The effect of impurities is studied and discussed by making use of two solutions at different purity level. Only within a narrow range of anodic potentials from 400 to 500 mV (he) are platinum electrodes free of adsorbed hydrogen and oxygen; at this potential the capacitance value is 34 μF/cm 2 (real surface area). For E > 400 mV, capacitance falls with time; the possible reasons for this phenomenon are examined and discussed. The capacitance curves obtained by the technique adopted in the present work are compared with steady-state curves.
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