Abstract
Various concentrations of potassium hydroxide (KOH) solution electrolytes were gelled with a hydroponics gelling agent and used in aluminum-air (Al-air) cells. An aluminum plate and a single air-cathode were used as the anode and cathode, respectively. The cells were discharged at a constant current density of 0.08, 0.80 and 1.60 mA/cm 2. The 0.6 M KOH concentration gave the highest capacity and power density of 105.0 mA h/g and 5.5 mW/cm 2, respectively. The capacity of the fabricated cell decreased when the KOH concentration went beyond 0.6 M. The corrosion of Al to Al(OH) 3 as shown by the structural and surface morphology observations was the main factor for the failure of the cells.
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