The effect of the addition of organic substances (amyl alcohol, caprylic acid, and diphenyl amine) to on hydrogen and oxygen adsorption and in the double layer region of smooth platinum was studied by impedance measurements and quasistationary potentiostatic current potential curves in the potential range between hydrogen and oxygen evolution. Hydrogen adsorption is inhibited. The double layer capacity decreases with increasing amyl alcohol concentration between +0.3 and +1.5v. The degree of coverage with molecules was computed between +0.3 and +1.2v from the capacity decrease. An oxidation of the organic substance occurs at potentials where the oxygen coverage is formed simultaneously. Amyl alcohol molecules are adsorbed before the oxidation. Their oxidation goes over an intermediate and takes place to a large extent on surface sites free of oxygen.
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M.W. Bréiter (1962) studied this question.