Electrochemical and Adsorption Measurements on Single Crystals: The Germanium-Iodide Solution System
Abstract
An apparatus for simultaneous electrochemical and adsorption studies on single crystals is described. The electrode surface can be cleaned and characterized after mounting in position, the composition of the electrolyte can be altered, and repeated adsorption measurements can be made without removing the electrode. By employing the radioactive tracer I131 the adsorption of iodide was determined as a function of electrode potential and orientation in solutions of various containing small amounts of . Reversible multilayer adsorption on the {111} surface was observed, with a distinct maximum near the rest potential. Desorption of iodide occurred at strongly anodic and cathodic potentials. In addition to reversible adsorption of iodide, incorporation of iodide into an anodically formed surface compound was observed in the case of the {100} surface over a limited range of and iodide concentration.
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