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Electronic structure, optical properties, and photocatalytic activities of LaFeO 3-NaTaO 3 solid solution
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2012 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 116, no 43, 22767-22773 p.Article in journal (Refereed) Published
Abstract [en]

A solid solution photocatalyst, Na 1-xLa xFe 1-xTa xO 3 (x up to 0.06), was prepared by the conventional solid-state method. The photophysical properties of the samples were studied by various experimental techniques and the electronic structures were investigated by using screened hybrid density functional (HSE06) calculations. The solid solution photocatalyst showed absorption of visible light extending up to 450 nm. Upon loading of platinum nanoparticles cocatalyst, the photocatalytic hydrogen evolution of 0.81 μ·mol·h -1·g -1 was obtained for 2% doping of LaFeO 3 in NaTaO 3, under visible radiation (λ > 390 nm; 20% methanol solution). The photocatalytic properties of the solid solution were found to be better than Fe doped NaTaO 3 compounds on account of the suitable band structure. The electronic structure analysis revealed that, in the case of Fe doping at the Ta site, unoccupied electronic states in between the band gap appear that are responsible for the visible-light absorption. However, in the case of La and Fe codoping (passivated doping) the mid-gap electronic states are completely filled, which makes the band structure suitable for the visible-light photocatalysis. The present solid solution of perovskites (LaFeO 3 and NaTaO 3) sheds light on the interesting photophysical properties and photocatalytic activities which could be beneficial for the photocatalysts derived from these compounds.

Place, publisher, year, edition, pages
2012. Vol. 116, no 43, 22767-22773 p.
Keyword [en]
Co-doping, Cocatalyst, Experimental techniques, Fe doping, Fe-doped, Hybrid density functional, Methanol solution, Photocatalytic activities, Photocatalytic hydrogen evolution, Photocatalytic property, Photophysical properties, Platinum nanoparticles, Solid state method, Unoccupied electronic state, Visible light, Visible-light photocatalysis, Band structure, Complexation, Electronic states, Electronic structure, Light, Loading, Methanol, Optical properties, Perovskite, Photocatalysis, Photocatalysts, Platinum, Sodium, Solid solutions, Tantalum, Tantalum oxides, Lanthanum
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-107240DOI: 10.1021/jp307857hISI: 000310482900014Scopus ID: 2-s2.0-84868157267OAI: oai:DiVA.org:kth-107240DiVA: diva2:576847
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Swedish Research CouncilFormas
Note

QC 20121214

Available from: 2012-12-14 Created: 2012-12-10 Last updated: 2017-12-06Bibliographically approved

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Ahuja, Rajeev
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