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Single crystal surfaces were used to examine the structure sensitivity of hydrogen chemisorption on Pt in dilute acid electrolyte. An electrochemical cell .... ;::..s coupled directly with an ultra-high vacuum system and low energy electron diffract:. ,:m ... (LEED) and Auger electron spectroscopy (AES) were used to determine the structure 8.r.1 I composition of the electrode surfaces. Hydrogen adsorption .... ms exarnined by triangc..lc:r s' .... eep cyclic voltammetry. Contributions to the multiple peaks observed in voltammcG:~'ams of Pt due specifically to anions were deduced and the effects of surface geometry alone were determined. A difference in hydrogen bond energy (3. 4 kcal/mole) was observed for hydrogen on the (lll)(lxl) and the (100)(lxl) surface. iiydro[;en .... ias also found to be more strongly bound at (~ 4 kcal/mole) at (100) steps than on th,~ • atomically flat (100) surface. Hydrogen adsorption on highly ordered surfaces couL be described quantitatively by the classical model for single site adsorption on a homogeneous surface with a weak interaction between nearest neighbor pairs. This repulsive interaction lowers the coverage at OV (NEE) or hydrogen on a perfect (111) surface to less than a monolayer. Some evidence is J-lresented suceesting that anion adsorption is also structure sensitive, and that the "third" anodic peak obsen'ed on Pt IJolycrystals in IN ~S04 is due to structure sensitive anion adsorption. ." Structure Sensitivity in The Electrocatalytic Properties of pt:I Hydrogen Adsorption on Low Index Single Crystals and the Role of Steps Philip N. Ross, Jr. United Technologies Research Center East Hartford, Connecticut 06108

Structure Sensitivity in the Electrocatalytic Properties of Pt: I . Hydrogen Adsorption on Low Index Single Crystals and the Role of Steps