fig7
Figure 7. Type-II energy band arrangement of (A) the first type and (B) the second type of p-n heterojunction. (A, B, I) is quoted with permission from Ding et al.[49]. (C) catalysis mechanism of Co3O4/TiO2. (D and E) GH of TiO2 and Co3O4 and (F and G) work function for the TiO2 and Co3O4 facets. (C-G) is quoted with permission from Wang et al.[54]. (H) band structure diagram for Ag3PO4/b-N-TiO2. (H) is quoted with permission from Zhou et al.[15]. (I) The charge segregation mechanism of Cu2O/Ni(OH)2/TiO2.
