“…A large number of metal oxides and sulfides (e.g. TiO 2 , 1-3 WO 3 , 4-6 SrTiO 3 , 7,8 ZnO, [9][10][11] CdS, [12][13][14][15][16][17] ZnS, 13,16,18,19 niobates, [20][21][22][23][24] and tantalates [25][26][27][28] ) have been examined as photocatalysts for hydrogen production from splitting water. However, the majority of the simple and mixed-metal oxides photocatalysts are primarily active for H 2 production under UV irradiation (l < 385 nm or E g $ 3.0 eV) present in only a small portion of solar light.…”