No. of Recommendations: 1
https://phys.org/news/2017-06-batteries-seawater-power-long-...
In contrast, OWP's power system is safer, cheaper, and longer-lasting. It consists of a alloyed aluminum, a cathode alloyed with a combination of elements (primarily nickel), and an alkaline electrolyte that's positioned between the electrodes.

When a UUV equipped with the power system is placed in the ocean, sea water is pulled into the battery, and is split at the cathode into hydroxide anions and hydrogen gas. The hydroxide anions interact with the aluminum anode, creating aluminum hydroxide and releasing electrons. Those electrons travel back toward the cathode, donating energy to a circuit along the way to begin the cycle anew. Both the aluminum hydroxide and hydrogen gas are jettisoned as harmless waste.

Components are only activated when flooded with water. Once the aluminum anode corrodes, it can be replaced at low cost.

Think of the power system as type of underwater engine, where water is the oxidizer feeding the chemical reactions, instead of the air used by car engines, McKay says. "Our power system can drink sea water and discard waste products," he says. "But that exhaust is not harmful, compared to exhaust of terrestrial engines."


PF
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