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Hydrophobized oxygen cathode of a fuel cell with a liquid electrolyte: Calculating overall currents and thicknesses

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Abstract

The mechanism governing operation of hydrophobized cathodes is discussed. A model is proposed for the active-layer structure. The model consists of equidimensional hydrophobic (agglomerates of polytetrafluoroethylene particles) and hydrophilic (agglomerates of carbon black particles with the catalyst on them) grains. The percolation characteristics of the model are calculated: the presence of a gas cluster and an ionic cluster is established, the specific area of contact between these clusters is determined, the magnitude of ionic conductivity is assayed, and so forth. The “model of cylindrical gas pores” is selected for calculating the overall current. Formulas for the bulk current density are determined. The overall characteristics of a cathode with a platinum catalyst on a carbonaceous carrier (on carbon black) in 7 M KOH at a temperature of 60°C are calculated with allowance made for the fact that the Tafel plots for the process of reduction of oxygen on platinum have two segments with different slopes.

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Authors and Affiliations

  1. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia

    Yu. G. Chirkov

  2. Moscow Institute of Engineering Physics, Kashirskoe sh. 31, Moscow, 117409, Russia

    V. I. Rostokin

Authors
  1. Yu. G. Chirkov
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  2. V. I. Rostokin
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Correspondence to Yu. G. Chirkov.

Additional information

Original Russian Text © Yu.G. Chirkov, V.I. Rostokin, 2007, published in Elektrokhimiya, 2007, Vol. 43, No. 2, pp. 154–164.

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Chirkov, Y.G., Rostokin, V.I. Hydrophobized oxygen cathode of a fuel cell with a liquid electrolyte: Calculating overall currents and thicknesses. Russ J Electrochem 43, 146–156 (2007). https://doi.org/10.1134/S1023193507020036

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  • DOI: https://doi.org/10.1134/S1023193507020036

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