Water structure at the multilayers of palladium deposited at nanostructured Au electrodes

In situ ATR-SEIRAS experiments were carried out to describe water structure at the surface of multilayers of Pd modified nanopatterned gold film electrodes in contact with aqueous 0.1 M HClO4 solution. The results show that the surface water becomes more ordered when the thickness of the Pd film increases. The "ice-like water" band becomes stronger and for the electrode with 5 ML Pd@Au, the ratio of "ice-like water" to "liquid-like water" becomes larger than that in bulk water. Concomitantly, the population of "monomers" or small water clusters diminishes. All surface water bands increase when hydrogen adsorption takes place. The bending band corresponding to "monomers" or "multimers" water is observed chiefly at the potentials of hydrogen adsorption.