Fig. 6: Activity and stability of photocatalytic overall water splitting.

a Comparison of the activity of Bi₃TiNbO₉-W with different dopant concentrations. Stability test of photocatalytic overall water splitting (λ ≥ 300 nm): (b) Bi₃TiNbO₉, (c) Bi₃TiNbO₉-W, (d) Bi₃TiNbO₉-W-PL.