context: The morphologies of NF, MoP/NF, NiCo-LDH/NF, and MoP@NiCo-LDH/NF-20 were also characterized by SEM (Fig. 3a, b and S2†). It can be seen that the folded lamellar structure is uniformly grown on and aggregated into a tremella shape on the smooth surface of NF, which can promote the increase in both specific surface area and active sites. In addition, the electrodeposition time was optimized to obtain MoP@NiCo-LDH/NF-x (Fig. S3†). When the electrodeposition time is 10 minutes, the MoP surface is coated with sparse NiCo-LDH nanosheets. With the increase of electrodeposition time, the MoP surface is coated with relatively dense NiCo-LDH nanosheets. However, as the electrodeposition time increases to 30 minutes, the NiCo-LDH nanosheets become more crowded. Too loose or too tight a structure is not conducive to the movement of ions in the electrolyte and charge transfer, thus affecting the performance of electrocatalysis, so MoP@NiCo-LDH/NF-20 should have relatively more active sites.