Abstract
Layered perovskite materials are thought to be excellent photocatalysts. However, which always fails to absorb visible light. In this paper, CdS quantum dots and Ni2+ were incorporated into the interlayer of layered calcium niobate perovskite KCa2Nb3O10 to achieve an efficient visible-light photocatalytic hydrogen production, which was prepared by direct cation exchange reaction and a sulfurization process. The X-ray photoelectron spectroscopy and HRTEM mapping confirmed that the substituted CdS QDs and Ni2+ are mainly located at the interlayer edges and interlamination. The performance was increased with the increase of the interlayered Ni content. The obtained sample KCNO/CdS-Ni-50 exhibited a photocatalytic H2 evolution rate of 5.21 mmol•h−1•g−1 without noble metals as co-catalysts, about 670 times higher than that of pristine KCa2Nb3O10. The highly efficient photocatalytic activity and stability can be ascribed to the S-scheme heterojunction structure, in which the sites for redox reaction were separated in space to inhibit the photo-generated electron-hole recombination.
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