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When an aluminium plate and a carbon plate are inserted into sea water, there is production of electricity between the two plates (galvanic
corrosion). The carbon plate or stainless steel can last for years.
AL is the anode 1.6v of electronegativity, and the process is produced by the oxydation of aluminium into AL(OH)3 aluminium hydroxyde with a
release of H2. The voltage is approximately 1 volt. The production is approximately 1 kwh per kg of aluminium. The speed of the reaction is a
function of the exposed surface area of the aluminium plate. For plates of 0.5 mm thickness (like a can of beer), it takes about 72 hours for
complete oxidization. The AL(OH)3 remains in suspension in the sea water, and can be recovered by simple filtration. From heating, AL(OH)3
will become AL2O3 aluminium oxyde or aluma, releasing H2.
AL atomic mass is 27. There are 37 mols/kg. AL gives away 3 electrons for 2 AL(OH)3 : 3 H2 are produced.
For each kg of AL, 55.5 mols of H2 are produced = 111 grams.
It takes about 15 KWh to produce 1 kg of aluminium from aluma (about 52 MJ/kg).
Due to the availability of an aluminium can at basically no cost (discarded for recycling), it is possible to imagine powering
some places like small islands.
For example, resorts that have a very high consumption of soft drinks and beers can re-use the cans for power production at a very low cost.
The aluminium hydroxyde residual can be recycled and sent back to aluminium smelters.
This can be a very environmental friendly rechargeable battery .