Electrolyte and water transfer through the porous electrodes of an immobilised-alkali hydrogen-oxygen fuel cell

This study concerns the performance of a hydrogen-oxygen fuel cell with an immobilized alkaline electrolyte, intended for use in space applications. After optimization of the hydrogen flow rate allowing the precise removal of the water produced by the overall reaction of the cell, the question of electrolyte transfer at the cathode is approached. During long-term operation of the cell, the reaction brings about the accumulation of OH- ions in the reaction zone and the expulsion of electrolyte into the oxygen compartment, known as the weeping effect. It is shown that this phenomenon can be avoided by dampening the oxygen at the cell inlet. The moisture level is a critical factor and optimization studies are also necessary if the performance of the cell is to be maintained.