A Study of the Adsorption and Desorption of Iodine and Iodide at Platinum Electrodes in 1.0M Sulfuric Acid

Publisher Website
Google Scholar
Abstract
Various reactions involving adsorption and desorption of I2 and I− at platinum electrodes in 1.0M were studied using a rotating, ring‐disk electrode. Reversibly adsorbed I2 was found to be desorbed in the potential region of the limiting current for the oxidation of I− to I2. Iodine was found to coexist with I− in an irreversible state of adsorption. The irreversibly adsorbed I2 is electrochemically reduced to I− at . The presence of irreversibly adsorbed I2 was determined to result in a positive shift of the potential for desorption of I2 from the reversible state of adsorption. Also found was evidence that I2 will slowly pass from the reversible to the irreversible state of adsorption at an electrode surface covered with irreversibly adsorbed I−.