In order to explore the capacity for the separated cell system to enable the reduction of other organics, we used a similar twochamber PTFE reactor with a 20 mL capacity. On the vent side, we used the same alkaline vent efflux solution described above (with a hydrogen balloon), and on the ocean side, the electrolyte was KI, with fumarate as the reactant, and rather than CO2 gas (we used a balloon of N2 so as to eliminate the possibility for competing organic reductions. For all the experiments described, the organic aqueous product analyzes were performed via proton nuclear magnetic resonance ( 1 H-NMR) and C NMR.