A visible-light-induced two-step overall water splitting was achieved by combining two types of photocatalysts prepared by introducing foreign elements into the identical mother structure with a controlled electronic band structure. Strontium titanate (SrTiO 3 ) was selected as the mother structure and was doped with either vanadium (and sodium) or rhodium to introduce visible light sensitivity. By utilizing these two types of SrTiO 3 -based photocatalysts, simultaneous liberation of hydrogen (H 2 ) and oxygen (O 2 ) with a molar ratio of ∼2:1 was achieved in the presence of iodate ion (IO 3 − )/iodide ion (I −

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