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P–N junction mechanism on improved NiO/TiO2 photocatalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
51844 46856 2011 4 PDF Available
Title
P–N junction mechanism on improved NiO/TiO2 photocatalyst
Abstract

The composite photocatalyst comprising p-type NiO and n-type TiO2 showed improved photoactivity due to the inhibition of electron–hole recombination. A series of P–N junction photocatalysts, NiO/TiO2, were prepared by incipient wetness impregnation. The photocatalysts were characterized by UV–vis spectroscopy, XRD and XPS. The photoactivity of photocatalysts was tested by the degradation of methylene blue. The results showed that 0.5 wt.% NiO/TiO2 had the highest activity as compared with TiO2. A P–N junction mechanism was proposed and verified that the photocurrent could be enhanced under forward bias in the NiO/TiO2 film. The photoactivity enhancement is attributed to P–N junction and co-catalyst effects.

Graphic abstractThe composite photocatalyst of p-type NiO and n-type TiO2 improves photoactivity due to the inhibition of electron–hole recombination. A P–N junction mechanism is verified by increasing photocurrent under forward bias. The enhanced activity is attributed to P–N junction of NiO/TiO2.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► The P–N junction of photocatalyst was studied by the photocurrents using voltammetry. ► The electron–hole recombination is retarded by the P–N junction of NiO/TiO2. ► Combination of p-type NiO and n-type TiO2 can improve photocatalytic activity.

Keywords
Photocatalysis; P–N junction; TiO2; NiO
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P–N junction mechanism on improved NiO/TiO2 photocatalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 14, 15 August 2011, Pages 1307–1310
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