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The long-term photocatalytic stability of Co2+-modified P25-TiO2 powders for the H2 production from aqueous ethanol solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
28542 44080 2006 5 PDF Available
Title
The long-term photocatalytic stability of Co2+-modified P25-TiO2 powders for the H2 production from aqueous ethanol solution
Abstract

In this paper, the long-term stability of photocatalytic activity of Co2+ doped P25-TiO2 nanoparticles for hydrogen production from aqueous ethanol solution is discussed using a photoelectrochemical method in detail. It was found that after a long-term photoreaction, the photocatalytic activity of Co2+ ion modified P25-TiO2 photocatalyst for hydrogen production has decreased by a factor of ca. 50%, and still was very high compared to that of pure P25-TiO2 photocatalyst. And the steady anodic photocurrent appeared to have an obvious decrease after photoreaction (from 2.75 × 10−4 to 1.5 × 10−4 A), but the character of photocurrent response was still similar to photoreaction before. Moreover, the most important reason for the decrease of photocatalytic activity is the removal of CoOx active species (x > 1) from the surface of TiO2 photocatalyst after a long-term photoreaction. In addition, a new CoOx intermediate species (x < 1, photooxidative potential at −0.36 V versus SCE) emerged on the surface of TiO2 photocatalyst during photoreaction.

Keywords
Photocatalytic reactivity stability; Co2+-modified TiO2; Photoelectrochemistry; H2 production
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The long-term photocatalytic stability of Co2+-modified P25-TiO2 powders for the H2 production from aqueous ethanol solution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 181, Issues 2–3, 31 July 2006, Pages 263–267
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
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Any Questions? feel free to contact us