Arsenic oxide (As(Ⅲ)), sodium phosphate monobasic anhydrous (H2PO4-), and antimony trioxide(Sb(Ⅲ)) are used as electrolyte additives in 4M sodium hydroxide (NaOH) electrolyte for Al-airbatteries. The effects of inorganic additives are examined through hydrogen evolution and selfcorrosion testing, electrochemical analysis, and surface analysis. Electrochemical tests show that thepresence of the additives lowers the hydrogen gas evolution rate and inhibits the adsorption ofhydrogen on the aluminum surface. The additives in order of effectiveness are: Sb(Ⅲ) > As(Ⅲ) >H2PO4-. The addition of additives decreases the self-corrosion of 4N Al, which improves the efficiencyof the Al-air battery. The additives are confirmed as effective inhibitors of the hydrogen generationreaction in Al-air batteries.
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