A Step Forward: Hydrogen Production on Cobalt Molybdenum Sulfide Electrocatalyst in Anion Exchange Membrane Water Electrolyzer

Cobalt molybdenum sulfide (Co0.5Mo0.5Sx) was evaluated, as an alternative cathode catalyst for hydrogen large scale production in an anion exchange membrane water electrolyzer (AEMWE). Performance testing in a Co0.5Mo0.5Sx//Ir single cell fed with 0.1 mol L-1 KOH exhibited the best activity reported to date for transition metal sulfide cathodes in alkaline media. The aforementioned cell presented good stability during 40 h of operation at 2 V; in addition, it has most of its current density degradation recovered in the beginning of the subsequent 10 h interval.