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

Muhammad Tahir; Beenish Tahir; Nor Aishah Saidina Amin

doi:10.1016/j.apsusc.2015.08.231

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

Muhammad Tahir, Beenish Tahir, Nor Aishah Saidina Amin

Research output: Contribution to journal › Article › peer-review

149 Citations (Scopus)

Abstract

Gold-nanoparticles (Au-NPs) incorporated TiO ₂ -nanowires (TiO ₂ -NWs) of controlled sizes prepared via hydrothermal and chemical reduction method have been investigated for CO ₂ photoreduction with H ₂ under visible light irradiations. The nanocatalysts have been characterized by XRD, FESEM, TEM, N ₂ adsorption-desorption, XPS, UV-vis and PL spectroscopy. Highly crystalline TiO ₂ nanowires of mesoporous structure were obtained in Au-deposited TiO ₂ NWs. Au-NPs, uniformly distributed over TiO ₂ -NWs as Au-metal state, hindered charges recombination rate and increased TiO ₂ activity under visible light through plasmon excitation. With the deposition of Au-NPs, the efficiency of CO ₂ reduction to CO was greatly enhanced under lower energy visible light irradiations. The maximum CO and CH ₃ OH yield rate over 0.5 wt.% Au-NPs/TiO ₂ NWs reached to 1237 and 12.65 μmole g catal. ^-1 h ^-1 , respectively. High quantum yield was also observed over Au-NPs/TiO ₂ NWs using H ₂ 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 CO ₂ conversion.

Original language	English
Pages (from-to)	1289-1299
Number of pages	11
Journal	Applied Surface Science
Volume	356
DOIs	https://doi.org/10.1016/j.apsusc.2015.08.231
Publication status	Published - Nov 30 2015
Externally published	Yes

Keywords

CO photoreduction
Gold nanoparticles
H reductant
Photocatalysis
Surface plasmon resonance
TiO nanowires

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
General Physics and Astronomy
Surfaces and Interfaces
Surfaces, Coatings and Films

Access to Document

10.1016/j.apsusc.2015.08.231

Cite this

Tahir, M., Tahir, B., & Amin, N. A. S. (2015). Gold-nanoparticle-modified TiO ₂ nanowires for plasmon-enhanced photocatalytic CO ₂ reduction with H ₂ under visible light irradiation Applied Surface Science, 356, 1289-1299. https://doi.org/10.1016/j.apsusc.2015.08.231

Gold-nanoparticle-modified TiO ₂ nanowires for plasmon-enhanced photocatalytic CO ₂ reduction with H ₂ under visible light irradiation . / Tahir, Muhammad; Tahir, Beenish; Amin, Nor Aishah Saidina.
In: Applied Surface Science, Vol. 356, 30.11.2015, p. 1289-1299.

Research output: Contribution to journal › Article › peer-review

Tahir, M, Tahir, B & Amin, NAS 2015, ' Gold-nanoparticle-modified TiO ₂ nanowires for plasmon-enhanced photocatalytic CO ₂ reduction with H ₂ under visible light irradiation ', Applied Surface Science, vol. 356, pp. 1289-1299. https://doi.org/10.1016/j.apsusc.2015.08.231

Tahir M, Tahir B, Amin NAS. Gold-nanoparticle-modified TiO ₂ nanowires for plasmon-enhanced photocatalytic CO ₂ reduction with H ₂ under visible light irradiation Applied Surface Science. 2015 Nov 30;356:1289-1299. doi: 10.1016/j.apsusc.2015.08.231

Tahir, Muhammad ; Tahir, Beenish ; Amin, Nor Aishah Saidina. / Gold-nanoparticle-modified TiO ₂ nanowires for plasmon-enhanced photocatalytic CO ₂ reduction with H ₂ under visible light irradiation In: Applied Surface Science. 2015 ; Vol. 356. pp. 1289-1299.

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abstract = " Gold-nanoparticles (Au-NPs) incorporated TiO 2 -nanowires (TiO 2 -NWs) of controlled sizes prepared via hydrothermal and chemical reduction method have been investigated for CO 2 photoreduction with H 2 under visible light irradiations. The nanocatalysts have been characterized by XRD, FESEM, TEM, N 2 adsorption-desorption, XPS, UV-vis and PL spectroscopy. Highly crystalline TiO 2 nanowires of mesoporous structure were obtained in Au-deposited TiO 2 NWs. Au-NPs, uniformly distributed over TiO 2 -NWs as Au-metal state, hindered charges recombination rate and increased TiO 2 activity under visible light through plasmon excitation. With the deposition of Au-NPs, the efficiency of CO 2 reduction to CO was greatly enhanced under lower energy visible light irradiations. The maximum CO and CH 3 OH yield rate over 0.5 wt.% Au-NPs/TiO 2 NWs reached to 1237 and 12.65 μmole g catal. -1 h -1 , respectively. High quantum yield was also observed over Au-NPs/TiO 2 NWs using H 2 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 CO 2 conversion.",

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AB - Gold-nanoparticles (Au-NPs) incorporated TiO 2 -nanowires (TiO 2 -NWs) of controlled sizes prepared via hydrothermal and chemical reduction method have been investigated for CO 2 photoreduction with H 2 under visible light irradiations. The nanocatalysts have been characterized by XRD, FESEM, TEM, N 2 adsorption-desorption, XPS, UV-vis and PL spectroscopy. Highly crystalline TiO 2 nanowires of mesoporous structure were obtained in Au-deposited TiO 2 NWs. Au-NPs, uniformly distributed over TiO 2 -NWs as Au-metal state, hindered charges recombination rate and increased TiO 2 activity under visible light through plasmon excitation. With the deposition of Au-NPs, the efficiency of CO 2 reduction to CO was greatly enhanced under lower energy visible light irradiations. The maximum CO and CH 3 OH yield rate over 0.5 wt.% Au-NPs/TiO 2 NWs reached to 1237 and 12.65 μmole g catal. -1 h -1 , respectively. High quantum yield was also observed over Au-NPs/TiO 2 NWs using H 2 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 CO 2 conversion.

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