AN INVESTIGATION ON THE PERFORMANCE OPTIMIZATION OF AN ALKALINE FUEL-CELL

A fuel cell test module was designed and constructed to determine the performance of an alkaline fuel cell. The sim was to optimize its perf ormance by changing some of its parameters and to integrate it with a hydrogen photobioreactor in future. The fuel cell was a single cell, h ydrogen-oxygen, aqueous electrolyte type. The performance characterist ics of the cell have been investigated. The electrodes were multilayer Teflon bonded gas diffusion type and were prepared by the rolling met hod. Active carbon or carbon black was used as support material wherea s platinum as catalyst and nickel screen as backing material. The comp onents of the electrodes were adjusted until optimum performance of th e fuel cell was obtained. The electrodes prepared were 0.5 mm thick ha ving 5 cm(2) area with different platinum loading. The voltage-current characteristics of the fuel cell in 30% or 50% KOK (w/w) solution wer e measured at different temperatures (20-60 degrees C). The best perfo rming fuel cell exhibited 950-417 mV potential, 0-75 mA/cm(2) current density and 60-30% efficiency with a temperature insensitive electrode within the range of 25-50 degrees C in 30% KOH electrolyte. (C) 1997 International Association for Hydrogen Energy.