The submerged photocatalyst sheets for liquid-phase water splitting were prepared following a similar procedure with several key differences. After applying the layer of optical glue onto glass sheets and treatment in a UV ozone cleaner, the RhCrOx-Al:SrTiO3 was deposited onto the sheets without the addition of Nafion®. The glue mask was then removed and the sheets annealed at 673 K for 1 hour.