Journal
RSC ADVANCES
Volume 6, Issue 62, Pages S6800-S6806Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra09647f
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Funding
- National Natural Science Foundation of China [21273203]
- Zhejiang Provincial Natural Science Foundation of China [LQ16B010001, LR15B010001, LR12B040001]
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials (Zhejiang Normal University) [ZJHX201507]
- Open Research Fund of Top Key Discipline of Chemistry in Zhejiang Provincial Colleges
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The combination of a metal with a semiconductor is a promising route to improve the solar-to-chemical conversion efficiency of photocatalysts. In this article, ultrathin Pd nanosheets are integrated with semiconductor TiO2 nanosheets for photocatalytic hydrogen evolution, which acts as a cocatalyst and plasmonic agent in ultraviolet and visible-near-infrared spectral regions, respectively. Owing to the unique two-dimensional (2D) nanostructure, the Pd nanosheet cocatalyst realizes the large TiO2-Pd interfacial area for electron transfer as well as a large Pd exposed area for reduction reactions, while the plasmonic Pd nanosheets offer strong vis-NIR light absorption for hot electron production as well as a large interfacial area for hot electron injection. As a result, the Pd nanosheets achieve improved photocatalytic activity in comparison with three-dimensional Pd nanotetrahedrons under both light irradiations. This work underlines the importance in choosing a suitable shape of metal in the surface and interface design of semiconductor-metal hybrid photocatalysts as well as the advantages of 2D metal nanostructures in realizing high photocatalytic performance.
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