Boosting photocatalytic H2 production performance over perovskite/CdS quantum dots S-scheme photocatalyst
Source abstract
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 Ni 2+ were incorporated into the interlayer of layered calcium niobate perovskite KCa 2Nb 3O 10 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 Ni 2+ 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 H 2 evolution rate of 5.21 mmol•h −1•g −1 without noble metals as co-catalysts, about 670 times higher than that of pristine KCa 2Nb 3O 10 . 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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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Perovskite Materials and Applications · Covalent Organic Framework Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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