Potential dependent surface relaxation of the Pt(001)/electrolyte interface

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Abstract
X-ray reflectivity measurements were used to determine the structure of the Pt(001)/solution interface as a function of the applied potential in alkaline and acid electrolytes. Unlike the Pt(001)/vacuum interface, the electrolyte interface was found to be unreconstructed at all potentials. The lattice spacing between the first and second layer was found to be a funciton of potential in the region where approximately a monolayer of H was adsorbed. The expansion was up to 2.5% of a lattice spacing (0.05 Å) in alkaline electrolyte, and up to 1% of a lattice spacing in acid electrolytes.