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Anodic behaviour of α-PbO2 substrates containing different percentages of lower lead oxides

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Abstract

A study has been made of the anodic behavior of lead oxide deposits containing 92, 80 and 60%α-PbO2. The non-porous deposits were prepared by electrodeposition from a plumbite bath containing different proportions of 30% formaldehyde solution, acting as a reductant in the cases of 80 and 60%α-PbO2. Measurements of the steady-state oxygen evolution reaction under constant surface conditions of the electrodes, were carried out galvanostatically within the current-density range 30–190μAcm−2. The oxygen overpotential values were found to increase with increasing the amount of superficially formedβ-PbO2 during anodization in sulphuric acid solution. In the proposed mechanism for the o.e.r, the rate determining step is an electron-transfer reaction. Tafel slopes having values of 220±10 mV dec−1 were obtained. Possible interpretation of these higher slopes is given which is based on the dual barrier model. Potential-time decay curves reveal a retarded oxygen diffusion process.

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Author notes

  1. A. A. El Miligy

    Present address: Nuclear Chemistry Department, Atomic Energy Establishment, Cairo, Egypt

Authors and Affiliations

  1. Department of Chemistry, Assiut University, Assiut, Egypt

    I. M. Issa & M. S. Abdelaal

  2. Institute of Physical Chemistry and Electrochemistry, University of Karlsruhe, Karlsruhe, Germany

    A. A. El Miligy

Authors
  1. I. M. Issa
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  2. M. S. Abdelaal
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  3. A. A. El Miligy
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Issa, I.M., Abdelaal, M.S. & El Miligy, A.A. Anodic behaviour of α-PbO2 substrates containing different percentages of lower lead oxides. J Appl Electrochem 5, 271–277 (1975). https://doi.org/10.1007/BF00608790

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  • DOI: https://doi.org/10.1007/BF00608790

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