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Make an Aluminum Air Battery

We show how to make an Aluminum Air Battery "Air" batteries are batteries that use oxygen from the air as an oxidant for their chemistry. Most batteries on the other hand carry another chemical as their oxidant. Air batteries are currently being researched by scientists as a means of energy storage for everything from cars to laptops. The aluminum air battery is one of the simplest to make. To do just mix 60 grams of salt with 300mL of water. Then attach wires to a ball of aluminum foil and a piece of steel wool. Put the aluminum in the bottom of the salt water and place a paper towel over it. Then place the steel wool on top. You now have an aluminum air battery. The iron in the steel catalyzes the reaction of oxygen with water to make hydroxide and the aluminum reacts with the hydroxide to make aluminum oxide. The power isn't very good because aluminum metal tends to passivate under these conditions. Better chemicals and electrode materials usually fix these issues, but that's beyond the ability of the home lab.