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Enhancement of visible-light-driven photocatalytic H2 evolution from water over g-C3N4 through combination with perylene diimide aggregates

Paper ID Volume ID Publish Year Pages File Format Full-Text
39118 45807 2015 6 PDF Available
Title
Enhancement of visible-light-driven photocatalytic H2 evolution from water over g-C3N4 through combination with perylene diimide aggregates
Abstract

•Novel solution-processed composite photocatalysts were fabricated feasibly.•Donor–acceptor perylene diimide assemblies were used as light-absorber for g-C3N4.•Composite has better visible-light-driven H2 evolution activity than bare Pt/g-C3N4.

Graphitic carbon nitride (g-C3N4) is among the most promising metal-free photocatalysts for H2 production from solar-driven water reduction. However, the photocatalytic efficiency of bulk g-C3N4 powders is limited. In this work, molecular aggregates of perylene tetracarboxylic diimides (PTCDIs, a robust class of air-stable n-type organic semiconductor) were loaded via solution processing on the surface of g-C3N4, which is pre-deposited with cocatalyst Pt nanoparticles. The PTCDIs/Pt/g-C3N4 composites thus fabricated exhibit broader visible-light response than Pt/g-C3N4, and possess excellent photochemical stability. The initial intramolecular charge transfer features of the PTCDIs, as well as their energy levels being matched to g-C3N4, ensure subsequent charge separation in the PTCDIs/Pt/g-C3N4 composites. When the composites are dispersed into aqueous solutions containing triethanolamine as a sacrificial electron donor, a tenfold enhancement of H2 evolution activity (∼0.375 μmol h−1) is achieved compared to bare Pt/g-C3N4 under visible-light (λ ≥ 420 nm) irradiation.

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Keywords
Photocatalysis; Water-splitting; Hydrogen; g-C3N4; Perylene diimide
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Enhancement of visible-light-driven photocatalytic H2 evolution from water over g-C3N4 through combination with perylene diimide aggregates
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 498, 5 June 2015, Pages 63–68
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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