Electronic structure, optical properties, and photocatalytic activities of LaFeO 3-NaTaO 3 solid solution

• 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.

Ämnesord

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

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

Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik

Publikations- och innehållstyp

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