The (photo)electrocatalytic performance of the LDH heterostructures towards HER and OER in 1.0 M KOH was assessed using a standard three-electrode cell. Initially, the Ni/Fe/Co ratio was evaluated and optimized to identify the most active NiFeCo-LDHs. The optimization was based on electrocatalytic performance, which was evaluated through linear scanning voltammetry (LSV) using a scan rate of 5 mV s -1 (Figure ). The corresponding Tafel plots and overpotentials at current densities of 10 and 50 mA cm -2 were also analyzed and are shown in Figures and. Afterwards, the best-performing electrodes with the high current densities, smallest Tafel slopes, and lowest overpotentials were further functionalized with Mo and MoS 2 to fabricate the NiFeCo-LDH, NiFeCo-Mo(doped)-LDH, MoS 2 @NiFeCo-LDH, and MoS 2 @NiFeCo-Mo(doped)-LDH electrodes.