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Dye-modification effects on water splitting activity of GaN:ZnO photocatalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
26813 43980 2013 8 PDF Available
Title
Dye-modification effects on water splitting activity of GaN:ZnO photocatalyst
Abstract

•Cocatalysts were necessary to achieve efficient photocatalytic water splitting.•Cr-TPPCl modified photocatalyst showed the highest photocatalytic activity.•The charge transfer mechanism of dye/GaN:ZnO photocatalyst was two step excitation.

Photocatalytic water splitting activities of GaN:ZnO modified with various porphyrins were investigated. Tetraphenylporphyrinato-chromium(III) chloride (Cr-TPPCl) showed the most positive effect on the photocatalytic activity of GaN:ZnO, and worked without decomposition in the photocatalytic water splitting for 24 h. Fluorescence spectra measurements revealed that photoluminescence intensity of GaN:ZnO was decreased by Cr-TPPCl modification and by loading RhOX and NiO cocatalysts. It suggests that charge or energy transfer occurs from GaN:ZnO to Cr-TPPCl and from Cr-TPPCl to RhOX-NiO cocatalysts. Fluorescence lifetime measurement showed electron transfer occurred from GaN:ZnO to Cr-TPPCl, and thus artificial photosynthetic water splitting was achieved on GaN:ZnO photocatalyst modified with various porphyrins under visible light. The apparent quantum efficiency of the dye-modified GaN:ZnO photocatalyst (RhOX (0.1 wt%), NiO (0.1 wt%)/Dye (0.5 wt%)/IrO2 (0.1 wt%)–GaN:ZnO) was 2.73% at 410 nm.

Graphical abstractArtificial photosynthetic water splitting was successfully achieved on RhOX, NiO/Cr-TPPCl/IrO2–GaN:ZnO photocatalyst under visible light irradiation.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photocatalysis; Photolysis; Porphyrinoids; Water splitting; Charge transfer
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Dye-modification effects on water splitting activity of GaN:ZnO photocatalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 272, 15 November 2013, Pages 41–48
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us