Mixed 3D/2D dimensional TiO₂ nanoflowers/MoSe₂ nanosheets for enhanced photoelectrochemical hydrogen generation

Recently, various kinds of methods have been implemented to broaden the visible light response and fasten the carrier's separation of TiO₂‐based photoanodes. As a promising hydrogen evolution reaction catalyst, MoSe₂ is rarely investigated especially combined with TiO₂ photoanode. In this study, we report a composite photoanode of MoSe₂ nanosheets (with 1T and 2H phase)‐modified 3D TiO₂ nanoflowers (NFs).The hybrid of 3D TiO₂ NFs/2D MoSe₂ holds great promise in boosting the PEC water splitting performance. TiO₂ NFs/MoSe₂‐15 showed the largest photocurrent density of 1.40 mA/cm², which was five times higher than that of pure TiO₂ NFs under AM1.5G illumination. Moreover 10 times improvement in current density was observed for the TiO₂ NFs/MoSe₂‐15 under visible light. This increase could be ascribed to synergistic effects of light absorption enhancement and more efficient carrier separation after MoSe₂ modification. This study not only provides a reference to boost the photoelectrochemical performance of photoelectrodes but also renders a perspective on the potential applications of MoSe₂ nanosheets.