Abstract
The structure, composition and electrochemical reactivity of iodine adsorbed from aqueous iodide solutions onto Pd(111) and Pd(100) single-crystal electrodes have been investigated. Characterization of the I/Pd system employed electrochemical and surface spectroscopic techniques. The electrochemical behavior of clean and ordered, and I-coated Pd(111) and Pd(100) electrodes in H2SO4, H3PO4 and HClO4 solutions was examined. The composition and structure of the I adlayer was a function of emersion potential. The deposition of an ordered multilayer of I was observed on the Pd(111) surface to form a proposed Pd(111)(9[square root (3x9)][square root(3)])R30°-I structure at 0.1 V. The anodic dissolution of the Pd electrode was dependent on the crystallographic face, pH, I surface coverage (θ[I]) and solution compositions. The anodic dissolution of the Pd did not significantly alter the long-range order of the I[ads] or of the electrode surface. Further, an adsorbed layer of I was shown to reorder an electrochemically disordered and an ion bombarded Pd(100) electrode.
McBride, John R. (1992). Surface electrochemical studies of iodine adlattices on Pd(111) and Pd(100) single-crystal electrodes. Texas A&M University. Texas A&M University. Libraries. Available electronically from
https : / /hdl .handle .net /1969 .1 /DISSERTATIONS -1450746.