Abstract
The search for active photocatalysts that directly split water to hydrogen (H2) under visible and near-infrared (NIR) light irradiation remains one of the most challenging tasks for solar energy utilization. Here we report that two dimensional (2D) black phosphorus (BP) nanoflakes can harness visible and NIR light for H2 evolution. In the presence of reduced graphene oxide and Pt nanoparticles, ca. 5.13 and 1.26μmol H2 were obtained after excited BP nanoflakes under >420nm and >780nm irradiation for 4h, respectively. The apparent quantum efficiencies (AQEs) were as high as approximately 8.7% at 420±5nm (visible) and 1.5% at 780±5nm (NIR), respectively. These results indicate that 2D BP can be used as visible- and NIR-activated elemental photocatalyst in artificial photosynthesis and renewable energy conversion.
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