Light-to-Hydrogen Improvement Based on Three-Factored Au@CeO<sub>2</sub>/Gr Hierarchical Photocatalysts.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35522525.
- Also identified by DOI 10.1021/acsnano.2c00509.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Recently, various attempts have been made for light-to-fuels conversion, often with limited performance. Herein we report active and lasting three-factored hierarchical photocatalysts consisting of plasmon Au, ceria semiconductor, and graphene conductor for hydrogen production. The Au@CeO<sub>2</sub>/Gr<sub>2.0</sub> entity (graphene outer shell thickness of 2.0 nm) under visible-light irradiation exhibits a colossal achievement (8.0 μmol mg<sub>cat</sub><sup>-1</sup> h<sup>-1</sup>), which is 2.2- and 14.3-fold higher than those of binary Au@CeO<sub>2</sub> and free-standing CeO<sub>2</sub> species, outperforming the currently available catalysts. Yet, it delivers a high maximum quantum yield efficiency of 38.4% at an incident wavelength of 560 nm. These improvements are unambiguously attributed to three indispensable effects: (1) the plasmon resonant energy is light-excited and transferred to produce hot electrons localizing near the surface of Au@CeO<sub>2</sub>, where (2) the high-surface-area Gr conductive shell will capture them to direct hydrogen evolution reactions, and (3) the active graphene hybridized on the defect-rich surface of Au@CeO<sub>2</sub> favorably adsorbs hydrogen atoms, which all bring up thorough insight into the working of a ternary Au@CeO<sub>2</sub>/Gr catalyst system in terms of light-to-hydrogen conversion.