Fig. 12. The mechanism model for the effect of boiling water sealing on the growth of LDHs. (I) The anodic film containing MgAl2O4 and amorphous Mg(OH)2 are generated from an active dissolution reaction with high current density. (II) The amorphous Mg(OH)2 gradually gathers in blocks to form a layered structure on the surface. (III) The aluminum atoms of the anodic films diffuse into Mg(OH)2 during the LDH-sealing process at the high temperature and pressure, which results in formation of LDHs on the anodic film.
