A remarkable change in the shape of the cyclic voltammogram of Pt ∕ SnO 2 in 1 M sulfuric acid was observed in the potential range from 0.6 to 1.0 V vs reversible hydrogen electrode. Although no change in the shape of the hydrogen adsorption/desorption region was observed during potential cycling, both the anodic current due to the formation of platinum oxides ( ca. 0.8 V ) and the cathodic current due to the reduction of platinum oxides ( 0.6 V ) decreased. The current in the electric double-layer region gradually increased during potential cycling, and a new redox couple formed. The ratio of the hydrogen desorption charge to the oxide reduction charge of Pt ∕ SnO 2 linearly decreased as the logarithm of the number of platinum particles per geometric unit area of SnO 2 decreased.
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Nakada et al. (2006) studied this question.
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