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 journalArticlepeer-review

146 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 languageEnglish
Pages (from-to)1289-1299
Number of pages11
JournalApplied Surface Science
Volume356
DOIs
Publication statusPublished - Nov 30 2015
Externally publishedYes

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

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