Fig. 6: Mott–Schottky results of the passive films.

a Mott–Schottky plots of the passive film after the potentiostatic polarization at 0.4 VSCE for 10 h, b The donor (ND) and acceptor densities (NA) of the n-type and p-type semiconductors.
a Mott–Schottky plots of the passive film after the potentiostatic polarization at 0.4 VSCE for 10 h, b The donor (ND) and acceptor densities (NA) of the n-type and p-type semiconductors.