Amorphous CoS x Growth on CaTiO 3 Nanocubes Formed S-Scheme Heterojunction for Photocatalytic Hydrogen Production

Amorphous and irregular nanoparticles of CoS x were anchored on regular CaTiO 3 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 H 2 evolution on CaTiO 3 nanocubes by CoS x 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 CaTiO 3 /CoS x is 117.5 μmol/h, which is 5.8 times that of CoS x and 43.9 times that of CaTiO 3 . 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.