PHENOMENA AT A GAS-ELECTRODE-ELECTROLYTE INTERFACE.
Technical rept. no. 3,
CALIFORNIA UNIV BERKELEY
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Many of the reactants proposed for use in fuel cells are gases. These undergo oxidation or reduction involving charge transfer on the solid surface of a porous matrix in the presence of an electrolytic solution. The purpose of the investigation was to determine where the reaction takes place spacially and what factors control the distribution and rate of the reaction. The variation of current density distribution along a plane, partially immersed electrode relative to the apparent meniscus was measured as a function of total applied current. Measurements are reported for the cathodic current density distribution of O2 gas and aqueous KOH electrolyte on sectioned Ni and Ag electrodes. These measurements show that the current extends well above the apparent meniscus into a thin electrolyte film on the surface of the electrode. The behavior of this system can be predicted by a mathematical model. Author