PbO-modified TiO2 thin films: a route to visible light photocatalysts

Langmuir : the ACS Journal of Surfaces and Colloids
Davinder S BhachuIvan P Parkin

Abstract

PbO clusters were deposited onto polycrystalline titanium dioxide (anatase) films on glass substrates by aerosol-assisted chemical vapor deposition (AACVD). The as-deposited PbO/TiO2 films were then tested for visible light photocatalysis. This was monitored by the photodegradation of stearic acid under visible light conditions. PbO/TiO2 composite films were able to degrade stearic acid at a rate of 2.28 × 10(15) molecules cm(-2) h(-1), which is 2 orders of magnitude greater than what has previously been reported. The PbO/TiO2 composite film demonstrated UVA degradation of resazurin redox dye, with the formal quantum yield (FQY) and formal quantum efficiency (FQE) exceeding that of a TiO2 film grown under the same conditions and Pilkington Activ, a commercially available self-cleaning glass. This work correlates with computational studies that predicted PbO nanoclusters on TiO2 form active visible light photocatalysts through new electronic states through PbO/TiO2 interfacial bonds resulting in new electronic states above the valence band maximum in TiO2, shifting the valence band upward as well as more efficient electron/hole separation with hole localization on PbO particles and electron on the TiO2 surface.

References

Sep 15, 2006·The Journal of Physical Chemistry. B·Andrew MillsMark McGrady
Mar 2, 2011·Advanced Materials·J B VarleyC G Van de Walle
Sep 23, 2011·Chemical Society Reviews·Andreas Kafizas, Ivan P Parkin
Jul 9, 2013·Nature Materials·David O ScanlonAlexey A Sokol

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Citations

Oct 9, 2015·Chemical Society Reviews·Caroline E Knapp, Claire J Carmalt
Feb 3, 2016·Advanced Materials·Michael NolanMarco Fronzi
Aug 1, 2016·Chemical Science·Davinder S BhachuClaire J Carmalt
Feb 18, 2021·ACS Applied Materials & Interfaces·Abdullah M AlotaibiIvan P Parkin

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