Fig. 3: Changes in crystal structure with the increased number of chemical elements and changes after the stability test.

XRD patterns of NiO_x, NiFe_0.3O_x, and NiFe_0.3MoO_x sprayed on glass substrates. XRD of NiFe_0.3MoO_x as-produced and after stability test (1000 CVs + 24 h CA) was sprayed on FTO substrates.