The mobile generates O2 in the anode and H2 with the cathode; a separator materials typically product of ceramics such as zirconium oxide keeps the gases from mixing although allowing drinking water and ions to maneuver freely. Innovation Chevron down Alkaline and PEM systems are commercially out there, though SOEC https://stephenvvtxc.oneworldwiki.com/7016803/the_5_second_trick_for_pem_electrolyser