Au-TiO₂ Nanocomposites and Efficient Photocatalytic Hydrogen Production under UV-Visible and Visible Light Illuminations: A Comparison of Different Crystalline Forms of TiO₂

Table 1

Amount of hydrogen evolved using Au/TiO₂ nanocomposites under dark, visible, and UV-visible photocatalytic runs for 5 h in the presence of ethanol (5 volume%) using a 450 W Mercury lamp.

Catalyst	Rate (𝜇mol/h)
	Dark	Visible	UV-visible
No catalyst	0.0	0.0	2.2
P25	0.0	1.9	90
Au/P25	0.0	6.9	1600
Anatase commercial	0.0	0.0	1.7
Au/anatase commercial	0.0	0.0	300
Anatase aerogel	0.0	0.0	18
Au/anatase aerogel	0.0	0.0	1200
Rutile	0.0	3.3	6.3
Au/rutile	0.0	5.6	530