Investigation of efficient electrode-electrolyte for al-air battery

For the Al-Air alkaline batteries,1) the yields of commercial aluminium alloys (AA6013 and AA7075) were compared with the pure aluminium (Al) to determine the proper anode material. In an alkaline environment, the rate of corrosion and hydrogen gas formation was calculated. Electrochemical impedance spectroscopy (EIS) and current-potential curves were taken. The galvanostatic dissolution test was examined and surface characterization (SEM-EDS and contact angle) was determined. 2) For determine the suitable cathode, the FeNi mesh was treated with Ag in two different ways (chemical and electrochemical coating). The effects of different chemical (5-30 min) and electrochemiccal (100-600 sec) coating periods were investigated. For each electrode, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), current-potential curves were taken. The best times were determined. Battery performances, surface properties (SEM-EDS and XRD) were determined. Changes in crystal structure were observed. 3) For improve battery performance, different concentrations of Glycol (0.25-1 M) was added to 4 M NaOH. In these electrolytes, the corrosion rate of aluminium and the rate of hydrogen gas formation were calculated. Electrochemical tests were performed (EIS and current-potential). As a result, the best anode was AA7075 alloy, the most efficient oxygen reduction cathode was found to be Ag electrochemical coated FeNi mesh electrode at 500 s and the lowest rate of corrosion belonged to 4 M NaOH electrolyte with 0.75 M Glycol.