کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
26813 43980 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dye-modification effects on water splitting activity of GaN:ZnO photocatalyst
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Dye-modification effects on water splitting activity of GaN:ZnO photocatalyst
چکیده انگلیسی


• 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.

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

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 272, 15 November 2013, Pages 41–48
نویسندگان
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