Regular study of lanthanide oxides for boosting photocatalytic hydrogen production on ZnIn2S4 photocatalysts
Source abstract
Abstract
Lanthanide oxides have potential advantages for photocatalytic hydrogen production. To systematically investigate the photocatalytic performance of lanthanide oxides on metal sulfides, a series of Ln xO y/ZnIn 2S 4 (Ln xO y /ZIS) were synthesized by hydrothermal method. Comprehensive characterization demonstrated that Ln xO y synergistically improved the performance of ZnIn 2S 4 by extending light absorption, reducing contact interface resistance and enhancing carrier separation. The photocatalytic hydrogen evolution (PHE) rates of the Ln xO y /ZIS photocatalysts were improved, which were 1.6–4.2 times higher than those of pure ZnIn 2S 4 (198.0 μmol g −1 h −1). The PHE rates of Ln xO y/ZIS decreased with increasing lanthanide atomic number, and when the lanthanides contained variable valence ions, the PHE rates of Ln xO y /ZIS were superior to those of neighbouring lanthanides. The heterojunction formed by Ln xO y and ZnIn 2S 4 effectively promoted carrier separation. Lanthanide ions with unoccupied 4 f orbital were more likely to accept electrons and served as a hydrogen adsorption site for further hydrogen reduction. Multivalent ions could also promote the migration of electrons and generate oxygen vacancies to inhibit the recombination of carriers. In conclusion, for ZnIn 2S 4, lanthanide oxides are promising candidates to improve the performance of PHE. This study provides guidance on the selection of appropriate lanthanide oxides for the construction of efficient sulphur-based heterojunction photocatalysts.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Copper-based nanomaterials and applications · Gas Sensing Nanomaterials and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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