To enhance H2yields from the photocatalytic splitting of seawater, better photocatalysts such as nanostructured TiO2promoted with NiO (2.5%) and CuO (2.5%) have been studied in the present work. The accumulated H2yielded from the photocatalytic splitting of seawater containing oxalic acid (50 mM) as the sacrificial reagents on CuO/nano-TiO2is 8.53 μmol/gcatafter the 5 h radiation. On the NiO/nano-TiO2photocatalyst, the H2yield is relatively low (i.e., 1.46 μmol/gcat). Note that the hole

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... ng with chlorides in seawater may be associated with the less H2yielded from the seawater photocatalysis (on CuO/nano-TiO2) if compared with that from water (42.4 μmol/gcat).