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A type of SPE-electrode, the SPE-hydrophobic gas diffusing electrode was reported and its characteristics were discussed,The reduction reaction of oxygen was examined at the Nafion-hydrophobic gas diffusing electrode with the counter electrode in contact with 1mol/L H2SO4, 1mol/L NaOH and distilled water, respectively. When contact with H2SO4 the electrode was found to behave just like a conventional gas diffusing electrode facing tree electrolyte, while contact with NaOH, however, the performance of the electrode decayed rapidly in the course of operation and no steady state could be reached. These observations and the results of apparent capacitance measurement reveal that the working electrode interface is the interface between the catalyst and the free electrolyte contained in the catalytic layer and that the electrode performance was seriously influenced by the selective ion-permeability of SPE and liquid phase resistance within the catalytic layer.
A type of SPE-electrode, the SPE-hydrophobic gas diffusing electrode was reported and its characteristics were discussed, The reduction reaction of oxygen was examined at the Nafion-hydrophobic gas diffusing electrode with the counter electrode in contact with 1 mol / L H2SO4, 1 mol / L NaOH and distilled water, respectively. When contact with NaOH, however, the performance of the electrode decayed rapidly in the course of operation and these observations and the results of apparent capacitance measurement reveal that the working electrode interface is the interface between the catalyst and the free electrolyte contained in the catalytic layer and that the electrode performance was seriously affected by the selective ion- permeability of SPE and liquid phase resistance within the catalytic layer.