Constructing SrTiO₃–TiO₂ Heterogeneous Hollow Multi‐shelled Structures for Enhanced Solar Water Splitting

Constructing hollow multi‐shelled structures (HoMSs) has a significant effect on promoting light absorption property of catalysts and enhancing their performance in solar energy conversion applications. A facile hydrothermal method is used to design the SrTiO 3 −TiO 2 heterogeneous HoMSs by hydrothermal crystallization of SrTiO 3 on the surface of the TiO 2 HoMSs, which will realize a full coverage of SrTiO 3 on the TiO 2 surface and construct the SrTiO 3 /TiO 2 junctions. The broccoli‐like SrTiO 3 −TiO 2 heterogeneous HoMSs exhibited a fourfold higher overall water splitting performance of 10.6 μmol h −1 for H 2 production and 5.1 μmol h −1 for O 2 evolution than that of SrTiO 3 nanoparticles and the apparent quantum efficiency (AQE) of 8.6 % at 365 nm, which can be mainly attributed to 1) HoMS increased the light absorption ability of the constructed photocatalysts and 2) the SrTiO 3 −TiO 2 junctions boosted the separation efficiency of the photogenerated charge carriers.