Abstract
AbstractMetal free two‐dimensional (2D) semiconductor nanomaterial black phosphorus (BP) is a promising photocatalyst for solar H2 evolution. Here, ultrathin BP nanosheets were prepared through organic salt sodium citrate assisted exfoliation of bulk BP. Further, an efficient photoelectrode for photoelectrochemical water splitting was developed based on TiO2 nanorod arrays, coated with ultrathin black phosphorus nanosheets. Compared to the pure TiO2 nanorod arrays, this structure exhibits reduced photoluminescent emission, longer carrier lifetime, and a strong photocurrent density enhancement of about 140 %. The high photoelectrochemical performance indicated the formed 2D‐1D BP/TiO2 heterostructure facilitates the charge separation and transfer. The interfacial interactions between black phosphorus and TiO2 were thoroughly investigated with XPS and FTIR spectroscopy.
Published Version
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