Abstract
The properties of catalysts for the electrochemical reduction of oxygen synthesized using Vulcan XC-72 carbon black, modified with silver and palladium using the borohydride method, were studied. The palladium content was in the range from 1 to 4% by the mass. The catalytic properties of the following catalyst samples were studied: Ag(10%)/C, Pd(4%)–Ag(10%)/C, Pd(2%)–Ag(10%)/C and Pd (1%)–Ag(10%)/C. Their electrocatalytic activity in the oxygen reduction reaction was studied by linear voltammetry using a rotating disk electrode (RDE) in a 0.1 M KOH solution air-saturated. The main kinetic parameters of the reaction (limiting currents, number of electrons) were calculated using the Koutecky-Levich equation, also the effect of the palladium concentration on the catalyst activity is shown. The presence of active sites on the catalyst surface was estimated by cyclic voltammetry in a de-aerated 0.1 M KOH solution. A synergistic effect of palladium and silver has been observed for the Pd(2%)–Ag(10%)/C catalyst, which enhances the efficiency of the oxygen reduction process.
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Shafigulin, R.V., Tokranova, E.O., Bulanova, A.V. et al. Carbon black modified with silver and low concentration of palladium as effective catalysts for electroreduction of oxygen in alkaline solutions. Reac Kinet Mech Cat 133, 455–465 (2021). https://doi.org/10.1007/s11144-021-01999-6
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DOI: https://doi.org/10.1007/s11144-021-01999-6