Figure 3

SEM images of (a) WO3, (b) C3N4, (c) 0.1C3N4/WO3, (d) 0.2C3N4/WO3, (e) 0.3C3N4/WO3, (f) 0.4C3N4/WO3, (g) 0.5C3N4/WO3, and (h) TEM image of 0.3C3N4/WO3, (i) HRTEM image of 0.3C3N4/WO3.
SEM images of (a) WO3, (b) C3N4, (c) 0.1C3N4/WO3, (d) 0.2C3N4/WO3, (e) 0.3C3N4/WO3, (f) 0.4C3N4/WO3, (g) 0.5C3N4/WO3, and (h) TEM image of 0.3C3N4/WO3, (i) HRTEM image of 0.3C3N4/WO3.