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Electroreduction of molecular oxygen on preferentially oriented platinum electrodes in acid solution

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Abstract

The oxygen electroreduction reaction was studied on two different preferentially oriented ((111)-type and (100)-type and on a conventional polycrystalline (PC) platinum rotating disc electrodes in acid solutions at 30 °C. At low overpotentials, Tafel lines of −0.060 V decade−1 were obtained on the three electrodes in oxygen-saturated 1.0m H2SO4 and 1.0m H2SO4 + y m K2SO4 (0 ⩽y ⩽ 1). At high over-potentials the usual Tafel slope of -0.120V decade−1 was observed on both (111)-type and PC platinum electrodes in 1.0m H2SO4, whereas a slope of −0.165V decade−1 was found on (100)-type platinum. In oxygen-saturated 1.0m H2SO4 the surface coverage by O-containing adsorbates on (100)-type platinum was greater than on both (111)-type and PC platinum. Rotating ring-disc electrode data showed that a higher amount of H2O2 was produced on (100)-type platinum than on the other platinum surfaces. The overpotential against current density plots are influenced by the anion concentration depending on the type of preferentially oriented platinum.

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Authors and Affiliations

  1. Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas, (INIFTA), Universidad Nacional de La Plata, Sucursal 4, Casilla de Correo 16, 1900, 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. Electroreduction of molecular oxygen on preferentially oriented platinum electrodes in acid solution. J Appl Electrochem 24, 119–125 (1994). https://doi.org/10.1007/BF00247782

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