Description: Opus 12 has redesigned the cathode of the commercially available PEM water electrolyzer such that it can support the reduction of carbon dioxide into ethylene and/or methane and suppress the competing hydrogen reaction. Methane and ethylene are well known polymer precursors that can be used as starting material to make plastics in extraterrestrial environments. PEM water electrolyzers have already been proven space worthy and are commercially available at various scales. Our innovation enables the creation of polyethylene and other polymers such as polyhydroxyalkanoates from the most basic starting materials: CO2, water and electricity. In Phase II, Opus 12 will continue to improve performance of the CO2 conversion process and build a working prototype of ethylene and methane production that will serve as the basis for a future commercial device.