High-Efficiently Photoelectrochemical Hydrogen Production over Zn-Incorporated TiO₂ Nanotubes

Figure 4

Adsorption-desorption isotherms of N₂ at 77 K for TNT and Zn-TNT: (a) TNT, (b) 0.001 mol% Zn-TNT, (c) 0.01 mol% Zn-TNT, and (d) 0.1 mol% Zn-TNT.

(a)

(b)

(c)

(d)