S-scheme heterojunction of CuBi2O4 supported Na doped P25 for enhanced photocatalytic H2 evolution

Rational design and construction of Step-scheme (S-scheme) photocatalyst have attracted considerable attention in the photocatalytic field. In this study, a series of Step-scheme (S-scheme) CuBi2O4/Na doped P25 photocatalysts (CBO/Na–P25) were synthesized through a facile hydrothermal method. CBO/Na–P25 photocatalyst without co-catalyst exhibited good photocatalytic performance for hydrogen evolution, and the H2 yield rate of the 7.5%CBO/Na–P25 sample achieved 2695.73 μmol/gcat/h after 4 h of illumination, which was more than 37.8, 13.7 and above 100 times those of pure P25, Na–P25 and CuBi2O4. The calculated apparent band gap of P25 decreased by Na doping and the construction of CuBi2O4/Na–P25 heterojunction contributed to efficient interfacial charge separation. Meanwhile, the S-scheme carrier transfer mechanism for the CuBi2O4/Na–P25 heterojunction photocatalyst was verified by the experimental results under different light wavelengths. This work demonstrated that the P25 based S-scheme heterojunction is a promising photocatalyst for hydrogen evolution.