Spatial separation of Pt and IrO2 cocatalysts on SiC surface for enhanced photocatalysis

The spatially separated Pt and IrO2 deposition on micro-SiC surface promotes the hydrogen evolution about 130 times higher photocatalytic and double times degradation rate of RhB activity than that of pure SiC. [Display omitted] •The spatially separated Pt and IrO2 deposition on micro-SiC surface wa...

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Bibliographic Details
Published in:Materials letters 2017-08, Vol.201, p.114-117
Main Authors: Wang, Da, Wang, Wenjun, Wang, Qi, Guo, Zhongnan, Yuan, Wenxia
Format: Article
Language:English
Subjects:
Catalysts
Catalytic activity
Cocatalysts
Degradation
Hydrogen evolution
Iridium compounds
Materials science
Photocatalysis
Silicon carbide
Water splitting
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Summary:The spatially separated Pt and IrO2 deposition on micro-SiC surface promotes the hydrogen evolution about 130 times higher photocatalytic and double times degradation rate of RhB activity than that of pure SiC. [Display omitted] •The spatially separated Pt and IrO2 deposition on micro-SiC surface was synthesized.•The interaction between Pt and SiC resulted in this spatial isolation.•The synergetic effect between Pt and IrO2 lengthened the lifetime of charge carriers by 11%.•The hydrogen evolution over Pt/SiC/IrO2 achieves 130 times higher photocatalytic activity than pure SiC. The spatially separated Pt and IrO2 deposition on micro-SiC surface was synthesized via an in-situ photo-depositing method. The interaction between Pt and SiC resulted in this spatial isolation, which then suppresses the photo-excited electron-hole recombination on SiC surface by the synthetic effect between two cocatalysts. Due to this mechanism, the hydrogen evolution over Pt/SiC/IrO2 achieves 130 times higher photocatalytic activity than that of pure SiC in the presence sacrifice reagent. The degradation rate of RhB was also increased by double times.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2017.04.140