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Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation

Gold-nanoparticles (Au-NPs) incorporated TiO2-nanowires (TiO2-NWs) of controlled sizes prepared via hydrothermal and chemical reduction method have been investigated for CO2 photoreduction with H2 under visible light irradiations. The nanocatalysts have been characterized by XRD, FESEM, TEM, N2 adso...

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Main Authors: Tahir, Muhammad, Tahir, Beenish, Saidina Amin, Nor Aishah
Format: Article
Published: Elsevier 2015
Subjects:
TP Chemical technology
Online Access:http://eprints.utm.my/id/eprint/55503/
http://dx.doi.org/10.1016/j.apsusc.2015.08.231
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spelling my.utm.555032017-02-15T04:46:20Z http://eprints.utm.my/id/eprint/55503/ Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation Tahir, Muhammad Tahir, Beenish Saidina Amin, Nor Aishah TP Chemical technology Gold-nanoparticles (Au-NPs) incorporated TiO2-nanowires (TiO2-NWs) of controlled sizes prepared via hydrothermal and chemical reduction method have been investigated for CO2 photoreduction with H2 under visible light irradiations. The nanocatalysts have been characterized by XRD, FESEM, TEM, N2 adsorption-desorption, XPS, UV-vis and PL spectroscopy. Highly crystalline TiO2 nanowires of mesoporous structure were obtained in Au-deposited TiO2 NWs. Au-NPs, uniformly distributed over TiO2-NWs as Au-metal state, hindered charges recombination rate and increased TiO2 activity under visible light through plasmon excitation. With the deposition of Au-NPs, the efficiency of CO2 reduction to CO was greatly enhanced under lower energy visible light irradiations. The maximum CO and CH3OH yield rate over 0.5 wt.% Au-NPs/TiO2 NWs reached to 1237 and 12.65 µmole g catal.-1 h-1, respectively. High quantum yield was also observed over Au-NPs/TiO2 NWs using H2 as reductant. The significantly improved photoactivity was evidently due to efficient electron-hole separation and surface plasmon response of Au-NPs. The reaction-pathway is proposed to provide insights over the mechanism of Au-plasmon-enhanced CO2 conversion Elsevier 2015-11 Article PeerReviewed Tahir, Muhammad and Tahir, Beenish and Saidina Amin, Nor Aishah (2015) Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation. Applied Surface Science, 356 . pp. 1289-1299. ISSN 0169-4332 http://dx.doi.org/10.1016/j.apsusc.2015.08.231 DOI:10.1016/j.apsusc.2015.08.231
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TP Chemical technology
spellingShingle TP Chemical technology
Tahir, Muhammad
Tahir, Beenish
Saidina Amin, Nor Aishah
Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation
description Gold-nanoparticles (Au-NPs) incorporated TiO2-nanowires (TiO2-NWs) of controlled sizes prepared via hydrothermal and chemical reduction method have been investigated for CO2 photoreduction with H2 under visible light irradiations. The nanocatalysts have been characterized by XRD, FESEM, TEM, N2 adsorption-desorption, XPS, UV-vis and PL spectroscopy. Highly crystalline TiO2 nanowires of mesoporous structure were obtained in Au-deposited TiO2 NWs. Au-NPs, uniformly distributed over TiO2-NWs as Au-metal state, hindered charges recombination rate and increased TiO2 activity under visible light through plasmon excitation. With the deposition of Au-NPs, the efficiency of CO2 reduction to CO was greatly enhanced under lower energy visible light irradiations. The maximum CO and CH3OH yield rate over 0.5 wt.% Au-NPs/TiO2 NWs reached to 1237 and 12.65 µmole g catal.-1 h-1, respectively. High quantum yield was also observed over Au-NPs/TiO2 NWs using H2 as reductant. The significantly improved photoactivity was evidently due to efficient electron-hole separation and surface plasmon response of Au-NPs. The reaction-pathway is proposed to provide insights over the mechanism of Au-plasmon-enhanced CO2 conversion
format Article
author Tahir, Muhammad
Tahir, Beenish
Saidina Amin, Nor Aishah
author_facet Tahir, Muhammad
Tahir, Beenish
Saidina Amin, Nor Aishah
author_sort Tahir, Muhammad
title Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation
title_short Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation
title_full Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation
title_fullStr Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation
title_full_unstemmed Gold-nanoparticle-modified TiO2 nanowires for plasmon-enhanced photocatalytic CO2 reduction with H-2 under visible light irradiation
title_sort gold-nanoparticle-modified tio2 nanowires for plasmon-enhanced photocatalytic co2 reduction with h-2 under visible light irradiation
publisher Elsevier
publishDate 2015
url http://eprints.utm.my/id/eprint/55503/
http://dx.doi.org/10.1016/j.apsusc.2015.08.231
_version_ 1643653817570426880
score 13.211869

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