Porous TiO₂Nanotubes with Spatially Separated Platinum and CoO_xCocatalysts Produced by Atomic Layer Deposition for Photocatalytic Hydrogen Production

Efficient separation of photogenerated electrons and holes, and associated surface reactions, is a crucial aspect of efficient semiconductor photocatalytic systems employed for photocatalytic hydrogen production. A new CoO_x/TiO₂/Pt photocatalyst produced by template-assisted atomic layer deposition is reported for photocatalytic hydrogen production on Pt and CoO_xdual cocatalysts. Pt nanoclusters acting as electron collectors and active sites for the reduction reaction are deposited on the inner surface of porous TiO₂nanotubes, while CoO_xnanoclusters acting as hole collectors and active sites for oxidation reaction are deposited on the outer surface of porous TiO₂nanotubes. A CoO_x/TiO₂/Pt photocatalyst, comprising ultra-low concentrations of noble Pt (0.046 wt %) and CoO_x(0.019 wt %) deposited simultaneously with one atomic layer deposition cycle, achieves remarkably high photocatalytic efficiency (275.9 μmol h⁻¹), which is nearly five times as high as that of pristine TiO₂nanotubes (56.5 μmol h⁻¹). The highly dispersed Pt and CoO_xnanoclusters, porous structure of TiO₂nanotubes with large specific surface area, and the synergetic effect of the spatially separated Pt and CoO_xdual cocatalysts contribute to the excellent photocatalytic activity.