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Influence of the multilayer adsorption of n ‐octanol and n ‐decanol on electrooxidation of the radical anion of 3‐nitrophthalic acid
Author(s) -
Matyjasiak Anna,
Stroka Jadwiga,
Galus Zbigniew
Publication year - 1996
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140081103
Subject(s) - chemistry , adsorption , kinetics , ion , dropping mercury electrode , electrode , electrochemistry , inorganic chemistry , monolayer , electrode potential , organic chemistry , biochemistry , physics , quantum mechanics
The electrooxidation of in situ produced electrolytically radical anion of 3‐nitrophthalic acid in various water—ethanol solutions containing 0.5 M NaCIO 4 , 0.05 M NaOH and inhibitor has been studied. The inhibition of the electrode kinetics in the presence of n ‐octanol and n ‐decanol, used as inhibitors, at relative concentrations not exceeding c/c s ≤ 0.5 could be interpreted in terms of the competitive monolayer adsorption of reactant, inhibitor and solvent on the electrode surface. At c/c s > 0.8, on the capacitance‐potential curves, a subtle minima caused by formation of two layers adsorbed on the mercury electrode were observed. The kinetics of the electrooxidation of the 3‐nitrophthalic acid anion radical was additionaly influenced by this multilayer. An equation which describes the inhibition of the electrode process by two adsorbed layers of inhibitor is presented and used in the estimation of the surface coverage in the second layer.