Various reactions involving adsorption and desorption of I 2 and I − at platinum electrodes in 1.0 M were studied using a rotating, ring‐disk electrode. Reversibly adsorbed I 2 was found to be desorbed in the potential region of the limiting current for the oxidation of I − to I 2 . Iodine was found to coexist with I − in an irreversible state of adsorption. The irreversibly adsorbed I 2 is electrochemically reduced to I − at . The presence of irreversibly adsorbed I 2 was determined to result in a positive shift of the potential for desorption of I 2 from the reversible state of adsorption. Also found was evidence that I 2 will slowly pass from the reversible to the irreversible state of adsorption at an electrode surface covered with irreversibly adsorbed I − .
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Dennis C. Johnson (1972) studied this question.