Cobalt phosphide as a highly active non-precious metal cocatalyst for photocatalytic hydrogen production under visible light irradiation

Abstract

Cobalt phosphide (Co₂P) is found, for the first time, to be a novel cocatalyst for efficient photocatalytic hydrogen evolution for a system containing CdS nanorods as a photocatalyst and DL-mandelic acid as an electron donor in water. Under optimal conditions, the H₂-production rate can reach up to 19 373 μmolh⁻¹ g⁻¹ after 10 h of LED light irradiation. Meanwhile, DL-mandelic acid can be oxidized to benzoylformic acid by the photo-generated holes of CdS nanorods, providing a green and economic way to synthesize benzoylformic acid from DL-mandelic acid.