Voltammetric stabilization of electrofaceted (100)-type platinum electrodes in acidic solutions

The voltammetric stabilization of electrofaceted (100)-type Pt electrodes prepared from polycrystalline Pt by fast repetitive triangular potential cycling are followed by conventional voltammetry in the H-electroadsorption/electrodesorption potential range in either 1 M H 2 SO 4 (0 to 35 °C) or 0.5 M HClO 4 (−2 to 35 °C). The influence of CO adsorption on the stabilized voltammetric profile is also considered. Depending on the potential cycling used in conventional voltammetry, two well-defined stabilized profiles at 0.1 V/s in the H-electroadsorption/electrodesorption range can be obtained, namely, that corresponding to the H-adsorption stabilized electrofaceted (100)-type Pt, and that related to the O-adsorption stabilized electrofaceted (100)-type Pt.The changes in the conventional voltammetric profiles can be interpreted in terms of surface modifications basically associated with either adsorption or electroadsorption processes. The influence of the anion (electrolyte composition) prevailing in solution is accounted for in terms of a competitive adsorption between anions and H-adatoms. The influence of temperature in the range covered by this work is smaller than that of the structure of the solution at the electrode/solution interface.