Figure 6

Planar averaged self-consistent electrostatic potential as a function of position in the -direction: (a,d) are for S_C- and P_C+V_C-GR/Ag₃PO₄(100) composites, respectively. The higher potential near the doped GR sheets leads to a potential well formed at interfaces. 3D charge density difference with an isovalue of 0.006 e/ų: (b,e) are for S_C- and P_C+V_C-GR/Ag₃PO₄(100) composites, respectively. Blue and yellow is surfaces represent charge accumulation and depletion in the space. Planar averaged charge density difference as a function of position in the -direction: (c,f) are for S_C- and P_C+V_C-GR/Ag₃PO₄(100) composites, respectively. The charge difference shows that charge transfer occurs inversely from the Ag₃PO₄ surface to GR and induces the electrostatic potential inverse at the interface.