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An Oxygen Generation System (OGS) is an indispensable system for a long manned space mission and water electrolysis technology is considered to be suitable for space applications. The authors have been studying OGS concerning a new proton exchange membrane and cathode liquid feed electrolytic cell. Progress is reported on the performance of the electrolytic cell at ambient pressure as well as the development of a high pressurized-cell module up to 10 atm. A 30,000 hour-endurance test at ambient pressure has demonstrated that the cathode liquid feed cell with the new membrane can generate the required oxygen.

An Oxygen Generation System (OGS) is an indispensable system for a long manned space mission. A Solid Polymer Water Electrolysis System (SPWES) has been developing by Kawasaki Heavy Industries, Ltd. for a future space mission since 1985. The authors have been studying the SPWES of a new solid polymer electrolyte with simplified cell structure. We presented the initial study results until 1993 at the former International Conference on Environmental Systems (ICES) shown in REFERENCE. The study was focused on the development of a SPWE cell at ambient pressure. This paper describes a follow-on study results related to development activity of a pressure cell module especially.