Aluminium-Oxygen fuel cells, for instance. They have been used in AUVs for about a decade (see http://www.ffi.no/hugin/ or http://www.ise.bc.ca/auv.html, for instance). They are closed, liquid based systems (the oxygen is in the form of hydrogen peroxide).
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Aluminium-Oxygen fuel cells, for instance. They have been used in AUVs for about a decade (see http://www.ffi.no/hugin/ or http://www.ise.bc.ca/auv.html, for instance). They are closed, liquid based systems (the oxygen is in the form of hydrogen peroxide).