Mixed 3D/2D dimensional TiO 2 nanoflowers/MoSe 2 nanosheets for enhanced photoelectrochemical hydrogen generation

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