http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Structure, composition, electrochemical behavior and thermal stability of aqueous derived sulfur layers at a Pd(111) electrode surface
The influence of solution pH, sulfide concentration and electrode potential on the structure, composition, thermal stability and electrochemical reactivity of sulfur chemisorbed from aqueous solutions onto well-defined Pd(111) electrode surfaces has been investigated. Experimental measurements were based upon conventional electrochemical techniques in combination with modem surface spectroscopic techniques. This work documents, for the first time, the formation of two highly ordered sulfur adlattices formed spontaneously upon exposure of a clean and ordered Pd(111) electrode to dilute aqueous solution of sulfide species. The adlattice structure of the chemisorbed sulfur depended upon the pH of the solution. In neutral and basic solutions a Pd(111)([square root]3x[square root]3)R 30°-S adlattice was formed. In acidic solution, a Pd(111)([square root]3x[square root]3)R-30°-S adlattice or a Pd(111)([square root]3x[square root]7)R 19.1°-S adlattice was formed. The thermal and electrochemical reactivities of the adsorbed sulfur were functions of the adlayer structure and coverage.