Electrochemical Contact Adsorption Site Changes Driven by Field and Charge Fact and Theory
IBM ALMADEN RESEARCH CENTER SAN JOSE CA
Pagination or Media Count:
When solvated anions like chloride or cyanide adsorb on metal electrodes from aqueous media they lost part of their solvation shell yielding a direct metal-ion bond. For certain anions this contact adsorption can occur even when the electrode carries net negative charge. On the basis of classical electrochemical measurements and deductive reasoning using simple models, electrochemists have evolved a detailed standard model of the disposition of ions, water, and organics adsorbed on the electrode in the range of potentials where the electric double layer is thermodynamically stable. There is evidence that the anions are physisorbed. However, it is only in more recent years through a variety of in situ probes of vibrational properties ftir and raman and geometry sexafs and gixs that this model is being really tested.
- Physical Chemistry