Amorphous CoSx Growth on CaTiO3 Nanocubes Formed S-Scheme Heterojunction for Photocatalytic Hydrogen Production

Amorphous and irregular nanoparticles of CoSx were anchored on regular CaTiO3 nanocubes by the method of in situ growth, and the S-scheme heterojunction for photocatalytic hydrogen production was constructed. The key role and potential mechanism of promoting photocatalytic H2 evolution on CaTiO3 nanocubes by CoSx were studied by various characterization methods. XRD, TEM, HRTEM, XPS, and other test methods confirmed that the low-cost S-scheme heterojunction was successfully constructed and effectively improved the photocatalytic hydrogen evolution. In addition, the photocatalytic experiments were carried out in triethanolamine (TEOA) solution, and the hydrogen evolution of CaTiO3/CoSx is 117.5 μmol/h, which is 5.8 times that of CoSx and 43.9 times that of CaTiO3. The hydrogen evolution test results showed that the composite catalyst has good performance, because the construction of the S-scheme heterojunction enhances the photocatalytic cracking capability of water by inhibiting the recombination of charge and holes. This work supplied new ideas for constructing S-scheme heterojunctions for photocatalysis.