A radiotracer study of the adsorption of H2SO4 at ruthenium electrodes

G. Horányi, A. Veres

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The adsorption of labelled H2SO4 was studied at a ruthenium electrode in 10-2 mol dm-3 HClO4 supporting electrolyte. Electrodes were obtained by the electrodeposition of Ru3+ ions on a thin gold layer. The potential dependence of the adsorption was studied over a wide potential range (-200 to + 1400 mV on the RHE scale). The appearance of two maxima (at E ∼ 100 and E ∼ 1000 mV) was observed on the Γ vs. E curve. The first maximum can be explained by the role of Hads and Oads species while the second one occurs in the potential range where the different transformation of surface oxide species takes place. These experimental results seem to be in agreement with expectations based on the voltammetric data reported in the literature [Conway and co-workers, J. Phys. Chem., 81 (1977) 2271; J. Electrochem. Soc., 125 (1976) 1471; Arvia and co-workers. J. Electroanal. Chem., 151 (1983) 193] concerning H and O electrosorption and formulation of surface oxide species. The potential dependence of the adsorption is discussed in the light of these data using the results obtained from the study of the mobility of adsorbed labelled species and hysteresis phenomena.

Original languageEnglish
Pages (from-to)259-265
Number of pages7
JournalJournal of Electroanalytical Chemistry
Issue number1-2
Publication statusPublished - Jun 25 1986

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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