R.R. Adz̆ić

University of Belgrade, Beograd, Central Serbia, Serbia

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Publications (2)2.58 Total impact

  • S. S̆trbac, R.R. Adz̆ić
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    ABSTRACT: Oxygen reduction on gold single crystal electrodes of various orientations, Au(hkl), in 0.1 M NaOH was studied by rotating disk electrode and rotating disk ring electrode techniques, with a goal to correlate the physical and chemical properties of the electrode surface with its catalytic activity. The characterization of the state of the electrode surface and the interface was carried out by cyclic voltammetry and differential capacity measurements.The geometrical arrangement and symmetry of surface atoms, and the presence of chemisorbed OH− anions, were found to play a key role in determining the catalytic properties of Au(hkl) surfaces for O2 reduction. It was proposed that chemisorbed anions act as a precursor for the dissociative adsorption of molecular oxygen or for chemisorption of reaction intermediate, catalyzing the 4e−-reduction of O2.
    Journal of Electroanalytical Chemistry 01/1996; · 2.58 Impact Factor
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    ABSTRACT: Hydrogen adsorption on single-crystal platinum low-index and stepped surfaces was studied in 0.1 M and 0.01 M NaOH solutions. A strong dependence on the crystallographic orientation of the electrode surface was found. The multiple states of hydrogen were correlated with the symmetry of surface sites. The data for the stepped surfaces were found to be useful in explaining the nature of processes occurring on the low index surfaces. Several strong indications were found for the nature of the so-called “butterfly” peak, indicating that it is due to adsorption of the hydroxil species rather than to hydrogen adsorption. Indications for hydrogen adsorption on Pt(111) in the H2 evolution region was found by impedance measurements. An effort was made to identify the multiple adsorption states for Pt(100). Hydrogen adsorption on the step sites for surfaces from all three crystallographic zones was identified and found to be proportional to the step density. A comparison with hydrogen adsorption in acid solutions was made for some surfaces.
    Journal of Electroanalytical Chemistry. 01/1992;