• Olesia B. Shmychkova Ukrainian State University of Chemical Technology, Dnipro, Ukraine, Ukraine
  • Dmitry V. Girenko Ukrainian State University of Chemical Technology, Dnipro, Ukraine, Ukraine
  • Valentina A. Knysh Ukrainian State University of Chemical Technology, Dnipro, Ukraine, Ukraine
  • Alexander B. Velichenko Ukrainian State University of Chemical Technology, Dnipro, Ukraine, Ukraine




platinized titanium, palladium, polarization curve, sodium hypochlorite


The electrochemical characteristics of Ti/Pt and Ti/Pt-Pd electrodes in oxygen evolution reaction and synthesis of sodium hypochlorite from low concentrated NaCl solutions were investigated in this work. It has been shown that the surface content of palladium has almost no effect on the value of the polarization of the electrode. The calculated effective activation energies of oxygen evolution reaction at E = 1.6 V are 38.11 for Ti/Pt(2.0); 35.27 for Ti/Pt(2.0)-Pd(0.2) and 34.88 kJ mol-1 for heat-treated Ti/Pt(2.0)-Pd(0.2). That is, the palladation of titanium with its subsequent heat treatment reduces the activation energy of oxygen evolution reaction compared to Ti/Pt by 3.33 kJ mol-1. Heat treatment leads to a significant reduction of the Tafel slope in the area of oxygen evolution potentials from 232 for Ti/Pt to 86 mV on Ti/Pt-Pd. CE (NaClO) = 84-93% with CE (NaClO3) less than 0.5 % were obtained on heat-treated Ti/Pt-Pd anodes in 0.15 M NaCl. Servise life of the electrodes involved was 1000 hours without change of activity.


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