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Enhanced photocatalytic hydrogen production activity of chromium doped lead niobate under visible-light irradiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
40273 45848 2013 7 PDF Available
Title
Enhanced photocatalytic hydrogen production activity of chromium doped lead niobate under visible-light irradiation
Abstract

•A novel series of Cr-doped HPb2Nb3O10 were synthesized.•Highest photocatalytic activity for H1−2xPb2Nb3−xCrxO10 with x = 0.05.•The band gap energy decreased with increasing Cr doping.•Recombination in the bulk was restrained by doping appropriate amount of Cr3+.

A series of Cr-doped layered HPb2Nb3O10 was prepared by a solid-state reaction followed by H+ exchange for the first time. The effects of doping on the structural and optical properties were comprehensively characterized by powder X-ray diffraction, UV–vis absorption spectroscopy, X-ray photoelectron spectroscopy, photoluminescence (PL) spectroscopy and scanning electron microscopy. Crystal structure was slightly adjusted by Cr3+ substituting for Nb5+. Absorption edge of the photocatalyst gradually red shifted with the increase of Cr3+, indicating the narrowing of band gap. Photocatalytic hydrogen evolution activity of Cr-doped HPb2Nb3O10, under full-arc or visible-light irradiation, gradually increased with Cr content up to 0.05 and thereafter decreased with higher Cr content. The activity of Cr(0.05)-doped HPb2Nb3O10 was twice as high as that of undoped HPb2Nb3O10. Narrower band gap and higher separation efficiency of photoinduced carriers in the bulk are the key factors that lead to its superior photocatalytic performance.

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Keywords
Photocatalysis; Hydrogen; Chromium; Layered niobate
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Enhanced photocatalytic hydrogen production activity of chromium doped lead niobate under visible-light irradiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 468, 5 November 2013, Pages 403–409
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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