Fig. 5. The heterojunction model of TiO2@Co3O4 (a), TiO2@Co (b), TiO2@Li2O (c) and TiO2@CoO (d). The displaying ELF map is illustrated on the left and the charge difference on the right, where the isosurface is set at 0.005 and marked by by positive (yellow) and negative (cyan) regions. To provide a details of the selected planes, the 3D figures of ELF figures are shown in Fig. S10. The XPS spectrum of Ti (e and f) and Co (g and h) before (e and g) and after cycling.
