On the adsorption of organic compounds on platinized platinum electrodes

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Abstract

Summarizing previous observations and literature data an attempt is made to survey the adsorption behaviour of different compounds taking into consideration the results obtained in the course of a study of the mobility of adsorbed species and the possible influence of reactions occurring with them. The behaviour of aliphatic saturated carboxylic acids, aliphatic saturated alcohols, aliphatic unsaturated dicarboxylic acids, aromatic compounds and acetone has been studied. From the experimental results it appears that the compounds studied may be divided into two groups as to the mobility of the adsorbed species. The aliphatic saturated carboxylic acids (with the exception of formic acid) belong to the first group which may be characterised by a significant mobility of the adsorbed species, i.e., a fast exchange between the adsorbed and non adsorbed species. It has been found that the behaviour (potential and concentration dependence of the adsorption) of simple saturated organic acids (excepting formic acid) is very similar to that of anions. The other compounds studied belong to the second group. The desorption rate of the adsorbed species formed from these compounds is very low, but increases at potentials where the occurrence of some reaction (oxidation or reduction) may be supposed or/and the adsorption of hydrogen or oxygen must be taken into consideration. For the potential and concentration dependence of the adsorption of compounds resulting in strongly bonded species, equations have been derived based upon model propositions.

Original languageEnglish
Pages (from-to)163-178
Number of pages16
JournalJournal of Electroanalytical Chemistry
Volume51
Issue number1
DOIs
Publication statusPublished - Mar 25 1974

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ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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