Zhang et al.reported, the real catalystactive site is the pseudoamorphousBi produced at the edges of Bi 2S3 nanorods with lattice strain during the HER process[26]. To createa pseudoamorphous Fe3O4/NiCx complex, Zhang et al. further annealed the NiFe PBA pre cursor, which was created using the sol –gel technique. It has been demonstrated by material characterisation and theoretical calculation that the pseudoamorphous Fe3O4/NiCx material has outstanding electrolytic water performance and stability due to the abundanceof oxygen defects and high valence cations [27].