The second option is to design electrolyzer systems capable of utilizing natural sea water to perform the electrolysis. It is probable that these systems would operate at a low power density and electrolyze only a small portion of the water in contact with electrodes. The disadvantages are new technology must be developed to solve the probable corrosion and contamination problems and undesirable electrochemical products such as chlorine. The advantages are possible lower capital costs and natural elimination of the waste brine which is only slightly enriched with salts. It may also be possible to recover economically significant quantities of the metals present in sea water that are less active electrochemically than hydrogen: silver, gold, mercury, and copper.
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