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Kinetics and mechanism of the electrochemical reduction of molecular oxygen on platinum in KOH: influence of preferred crystallographic orientation

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Abstract

The oxygen electroreduction reaction has been studied at both preferred oriented and conventional polycrystalline platinum rotating disc electrodes in x m KOH (0.05 ⩽ x ⩽ 3.0) aqueous solutions under oxygen saturation at 25°C. At low current densities, Tafel lines with slope -0.060 V decade−1 have been obtained at all platinum electrodes. At high current densities, higher Tafel slopes ranging from -0.18 to -0.40 V decade−1 have been observed, depending on the type of preferred oriented Pt and KOH concentration. Rotating ring-disc electrode data have shown that a higher amount of H2O2 is produced on one type of preferred oriented surface at all KOH concentrations. A complex reaction scheme has been used to evaluate the electrochemical rate constants of the reaction steps at three platinum electrodes.

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Authors and Affiliations

  1. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata, Sucursal 4, Casilla de Correo 16, (1990), La Plata, Argentina

    C. F. Zinola, A. M. Castro Luna, W. E. Triaca & A. J. Arvia

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  1. C. F. Zinola
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  2. A. M. Castro Luna
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  3. W. E. Triaca
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  4. A. J. Arvia
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Zinola, C.F., Castro Luna, A.M., Triaca, W.E. et al. Kinetics and mechanism of the electrochemical reduction of molecular oxygen on platinum in KOH: influence of preferred crystallographic orientation. J Appl Electrochem 24, 531–541 (1994). https://doi.org/10.1007/BF00249854

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