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TiO2 nanoparticles as electron pools: Single- and multi-step electron transfer processes

Paper ID Volume ID Publish Year Pages File Format Full-Text
26226 43941 2012 9 PDF Available
Title
TiO2 nanoparticles as electron pools: Single- and multi-step electron transfer processes
Abstract

The one electron reduction of the viologen compounds methylviologen (MV2+) and benzylviologen (BV2+) mediated by electrons loaded on TiO2 nanoparticles has been studied employing the stopped flow mixing technique. Details of the underlying reaction kinetics such as the concentration and the ionic strength dependence have been studied. The role of V2+ as an electron relay for the hydrogen production was verified, i.e., the subsequent decay of V+ was observed in the presence of noble metal nanoparticles (Aun0, Ptn0). It could be shown that the latter process is due to the electron transfer from V+ to adsorbed H+ ions on the surface of the metal particles forming H2. The rate constant of H2 production in the presence of V2+ was found to be 3 times higher than that in the V2+ free system evincing the advantages of multi-step electron transfer processes.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The one electron reduction of the viologen compounds methylviologen (MV2+) and benzylviologen (BV2+) mediated by electrons loaded on TiO2. ► The factors influencing the formation kinetics of V+ such as the initial concentration of V2+ compounds and the ionic strength have been studied. ► The kinetics of H+ reduction on the surface of Nobel metal particles Au and Pt investigated in presence and in absence of V+. ► The role of V2+ as an electron relay for the hydrogen production was verified. ► The decay of viologen radical in the presence of metal particles reveals the role of V2+ as an electron relay for hydrogen production.

Keywords
TiO2; Electron transfer; Viologen dications; Nobel metal nanoparticles
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TiO2 nanoparticles as electron pools: Single- and multi-step electron transfer processes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 245, 1 October 2012, Pages 9–17
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
Online Support
Any Questions? feel free to contact us