Table 6.

Binding energy of main elements in the film layers.

Element	Peak	Species/binding energy(eV)
Cr	2p3/2	Cr(met)/573.7 ± 0.2; Cr2O3/574.5 ± 0.3; Cr(OH)3/575.4 ± 0.1
Fe	2p3/2	Fe(met)/706.4 ± 0.2; Fe3O4/707.5 ± 0.2; FeO/709.5 ± 0.1 FeOOH/713.1 ± 0.3
Mo	3d5/2	Mo(met)/227.5 ± 0.3; Mo4+/228.9 ± 0.2; Mo6+/229.4 ± 0.3
	3d3/2	Mo(met)/230.4 ± 0.1; Mo4+/231.5 ± 0.2; Mo6+/232.8 ± 0.1
Ni	2p3/2	Ni(met)/852.4 ± 0.2; NiO/854.1 ± 0.2
N	1 s	N/399.6 ± 0.3
O	1 s	O2−/529.7 ± 0.2, OH−/531.2 ± 0.2; H2O/531.8 ± 0.3