Effect of titanium dioxide crystalline structure on the photocatalytic production of hydrogen

Agatino Di Paola, Leonardo Palmisano, Elena Selli, Gian Luca Chiarello

Risultato della ricerca: Articlepeer review

55 Citazioni (Scopus)

Abstract

The effect of the crystalline phase of TiO 2 (anatase, rutile and brookite) on its photocatalytic activity in hydrogen production from methanol-water vapours has been investigated by testing a series of both home-made and commercial TiO 2 photocatalysts, either bare or surface-modified by deposition of a fixed amount, i.e. 1 wt%, of platinum as co-catalyst. For all of the TiO 2 samples the rate of hydrogen production increased by one order of magnitude upon Pt deposition, because of the ability of Pt to enhance the separation of photoproduced electron-hole pairs. Under irradiation in the 350-450 nm wavelength range, brookite and anatase showed similar photoactivities, both superior to that of rutile. By contrast, rutile, possessing a narrower band gap, was active also under visible light (λ > 400 nm), whereas no hydrogen evolution was observed with anatase and brookite under such conditions. Surface area proved to be a key parameter, strongly influencing photoactivity. However, as the particle size became ultra-small, the semiconductor absorption edge was blue-shifted because of size quantisation effects, with a consequent decrease in hydrogen production rate due to the smaller portion of incident photons absorbed by the photocatalyst. © The Royal Society of Chemistry and Owner Societies 2011.
Lingua originaleEnglish
pagine (da-a)355-360
Numero di pagine6
RivistaPHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES
Volume10
Stato di pubblicazionePublished - 2011

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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