Inspired by the exceptional performance of MoS 2 @NiFeCo-LDH towards OER and MoS 2 @NiFeCo-Mo(doped)-LDH toward HER, these materials were employed as the anode and cathode, respectively, in a two-electrode water electrolysis cell Figure shows the polarization curves in 1.0 M KOH solution for the assembled MoS 2 @NiFeCo-Mo(doped)-LDH‖MoS 2 @NiFeCo-LDH electrolyzer under both light irradiation and dark conditions. The results are compared with the Pt/C‖RuO 2 benchmark cell. The results show that the MoS 2 @NiFeCo-Mo(doped)-LDH‖MoS 2 @NiFeCo-LDH cell requires 1.54 V (1.85 V) voltage to reach the current densities of 10 mA cm -2 (100 mA cm -2 ) (see also Video S1 (under dark), S2 (under light)). Under light irradiation, the voltage decreases to 1.46 V and 1.68 V at current densities of 10 and 100 mA cm -2 , respectively. This performance surpasses the performance of Pt/C‖RuO 2 and most reported OWS electrolyzers as shown in Table .