Abstract
The rational fabrication of inorganic–organic S-scheme heterojuncion hybrid photocatalysts on specific crystal facets is challenging but significant. Herein, we report that TpPa-1-covalent organic framework (COF) selectively grown on {010} crystal facets of decahedral BiVO4 (TpPa-1/{010}-BVO, denoted as TB-1) was synthesized through a surfactant-assisted microwave solvothermal route. The experimental results and theoretical calculations showed that TB-1 was more beneficial to separation of photogenerated carriers than the heterojunction randomly formed at all crystal facets ({010} + {110}) of BiVO4 (TpPa-1/BVO, denoted as TB-2). As a result, photocatalytic oxygen reduction reaction (ORR) activity for H2O2 production over TB-1 reached 723 μmol·gcat−1·h−1, which is 72.3-times, 5.7-times, and 2.4-times higher than individual BiVO4 (10 μmol·gcat−1·h−1), TpPa-1 (127 μmol·gcat−1·h−1), and TB-2 (305 μmol·gcat−1·h−1). In addition, the introduction of TpPa-1 could inhibit the decomposition of H2O2. This study not only provides a new hybrid photocatalyst for artificial H2O2 production but also highlights the importance of crystal facet engineering in the design of highly efficient photocatalysts.
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