Effect of Electrolyte Concentration and Depth of Discharge for Zinc-Air Fuel Cell

To understand the origins of performance variations in zinc-air fuel cell (ZAFC), the experimental study on the effects of the ZAFC for electrolyte concentration and depth of discharge was carried out by voltammetric, discharge profile and EIS methods. The highest cell performance was achieved at 7 M KOH, which resulted in a maximum current density of 102.0 mA cm-2 at 1.0 V vs. Zn. Moreover, R decreased in high-frequency when the discharge time increased, it is related to total ohmic resistance in the ZAFC. The degradation of ZAFC increases with increasing discharge time. The observed trend is favorable for confirming the time of replacing the zinc plate and (or) the electrolyte in ZAFC.