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Photocatalytic water splitting using particulate semiconductors is a potentially scalable and economically feasible technology for converting solar energy into hydrogen^,,. Z-scheme systems based on two-step photoexcitation of a hydrogen evolution photocatalyst (HEP) and an oxygen evolution photocatalyst (OEP) are suited to harvesting of sunlight because semiconductors with either water reduction or oxidation activity can be applied to the water splitting reaction^,. However, it is challenging to achieve efficient transfer of electrons between HEP and OEP particles^,. Here, we present photocatalyst sheets based on La- and Rh-codoped SrTiO₃ (SrTiO₃:La, Rh; ref. ) and Mo-doped BiVO₄ (BiVO₄:Mo) powders embedded into a gold (Au) layer. Enhancement of the electron relay by annealing and suppression of undesirable reactions through surface modification allow pure water (pH 6.8) splitting with a solar-to-hydrogen …