Construction of SrTiO3–LaCrO3 Solid Solutions with Consecutive Band Structures for Photocatalytic H2 Evolution under Visible Light Irradiation

SrTiO3–LaCrO3 continuous solid solutions with LaCrO3 content ranging from 0.00 to 1.00 were prepared via a polymerized complex method. The light absorption ability of SrTiO3 was improved by the consecutive tuning bandgap upon introduction (up 570 nm). exhibited significantly enhanced photocatalytic activities for H2 evolution under visible irradiation, an optimized rate 1368 μmol h−1 g−1 obtained when 0.10 (with 1 wt% Pt as cocatalyst), corresponding apparent quantum yield 3.68% at 400 nm. Supported comprehensive characterization, performance attributed simultaneously adjusted conduction band and valance originating hybridization Cr 3d, Ti 3d O 2p orbitals, well accelerated separation migration photogenerated charge carriers derived distortion TiO6 octahedra.