By photodeposition of CrOx on SrTiO3-based semiconductors doped with aliovalent Mg(II) and functionalized Ni/NiOx catalytic nanoparticles (economically significantly more viable than commonly used Rh catalysts), an increase in apparent quantum yield (AQYs) from ∼10 to 26% overall water splitting was obtained. More importantly, deposition also enhances the stability Ni/NiO production hydrogen, a...