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5 years ago

Facet Engineered Interface Design of Plasmonic Metal and Cocatalyst on BiOCl Nanoplates for Enhanced Visible Photocatalytic Oxygen Evolution

Facet Engineered Interface Design of Plasmonic Metal and Cocatalyst on BiOCl Nanoplates for Enhanced Visible Photocatalytic Oxygen Evolution
Song Bai, Shuxian Zhong, Lijie Bai, Jingjing Lu, Luna Li, Fan Ye
Integration of plasmonic metal and cocatalyst with semiconductor is a promising approach to simultaneously optimize the generation, transfer, and consumption of photoinduced charge carriers for high-performance photocatalysis. The photocatalytic activities of the designed hybrid structures are greatly determined by the efficiencies of charge transfer across the interfaces between different components. In this paper, interface design of Ag-BiOCl-PdOx hybrid photocatalysts is demonstrated based on the choice of suitable BiOCl facets in depositing plasmonic Ag and PdOx cocatalyst, respectively. It is found that the selective deposition of Ag and PdOx on BiOCl(110) planes realizes the superior photocatalytic activity in O2 evolution compared with the samples with other Ag and PdOx deposition locations. The reason was the superior hole transfer abilities of Ag-(110)BiOCl and BiOCl(110)-PdOx interfaces in comparison with those of Ag-(001)BiOCl and BiOCl(001)-PdOx interfaces. Two effects are proposed to contribute to this enhancement: (1) stronger electronic coupling at the BiOCl(110)-based interfaces resulted from the thinner contact barrier layer and (2) the shortest average hole diffuse distance realized by Ag and PdOx on BiOCl(110) planes. This work represents a step toward the interface design of high-performance photocatalyst through facet engineering. Facet engineered interface design of Ag-BiOCl-PdOx photocatalysts is performed through depositing plasmonic Ag and PdOx cocatalyst on suitable BiOCl facets. Enabled by the superior hole transfer abilities across BiOCl(110)-based interfaces and the shortest hole transfer distance between Ag and PdOx, Ag-(110)BiOCl(110)-PdOx achieves higher photocatalytic O2 evolution activity compared with Ag-BiOCl-PdOx structures with other locations of Ag and PdOx.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201701607

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