In this study, nickel-iron sulfide (NiFeS) nanosheets were immobilized on Ti3C2 MXene-decorated nickel foam (Ti3C2 MXene/NF) by hydrothermal reaction (NiFeS@Ti3C2 MXene/NF). The morphology of NiFeS and interactions with Ti3C2 MXene resulted in electronic coupling that optimized the adsorption energies of water, protons, and oxygen atom for the HER (180 mV@20 mA cm-2) and OER (290 mV@20 mA cm-2). The NiFeS@Ti3C2 MXene/NF catalyst showed good water splitting performance in an alkaline membrane water electrolyzer, yielding a current density (j) of 401 mA cm-2 at 1.85 V with 67.65 % cell efficiency, performance comparable to Pt/C||RuO2 cells. From a commercial point of view, our electrolyzers are the best because of their low loading of catalysts (ca. 1.25 mg cm-2) and low operating temperatures (50 °C), resulting in low capital and operating costs. Our findings will aid the development of commercial green hydrogen production and offers an alternative to PEMWE.