The influence of amino acids on electrocatalytic reactions occurring at a platinized platinum electrode in alkaline medium. Radiotracer study of the chemisorption of glycine

G. Horányi, E. M. Rizmayer

Research output: Article

29 Citations (Scopus)

Abstract

The effect of some amino acids (glycine, alanine and glutamic acid) on the electrocatalytic processes occurring at a platinized platinum electrode was studied in alkaline medium. Strong inhibition was observed in the case of oxidation of NH3 and CH3OH. No inhibition of the electrocatalytic reduction of maleic acid was observed when the potential was kept at low values (E < 100 mV on the RHE scale). However, a temporary shift of the potential to more positive values (E {reversed tilde equals} 300-400 mV) caused a significant decrease in the reduction rate. The most pronounced effects were observed for glycine. The adsorption of this compound was studied by a radiotracer method. The results of the adsorption study prove that strong irreversible chemisorption of glycine takes place at potentials above 100 mV. The inhibition phenomena observed in the course of the electrocatalytic processes are explained on the basis of the results obtained from the adsorption studies.

Original languageEnglish
Pages (from-to)393-400
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume198
Issue number2
DOIs
Publication statusPublished - febr. 10 1986

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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