Add time:08/02/2019         Source:sciencedirect.com

The surface of a platinum electrode was anodically polarized at 3 V vs standard hydrogen electrode in 1 N H2SO4at 300 K for 16 h so that a thick uniform oxidation layer was formed. Analysis by X-ray photoelectron spectroscopy (XPS) showed that the stoichiometry O-to-Pt of this layer was equal to four, with O1s and Pt4f72 binding energies at 53.1 and 74.4 eV respectively. The oxidation layer is therefore proposed to consist of Pt(OH)4. Cyclic voltammograms showed a single cathodic oxygen peak in support of a single uniform oxidation compound.The comparison with spectra of thinner layers, grown at potentials between 1.2 and V vs she for only 15min, led to the conclusion that those are also made up predominantly of platinum hydroxide. Surface Pt(OH)4 thermally decomposes at 405 ± 5 K into a mixture of Pt4/Pt2+ hydroxides and oxides and Pt-metal with a measured ratio Pt:O = 1. At about 700 ± 50 K only a monolayer of adsorbed oxygen is left and at 1070 K all oxygen is desorbed.

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