Arca, Elisabetta and Mulas, Gabriele Raimondo Celestino and Delogu, Francesco and Rodriguez-Ruiz, Jesus and Palmas, Simonetta (2009) The Influence of mechanical processing on the photoelectrochemical behaviour of TiO2 powders. Journal of Alloys and Compounds, Vol. 477 (1-2), p. 583-587. ISSN 0925-8388. Article.
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Anatase TiO2 powders have been subjected to mechanical treatment for selected time intervals. The mechanical processing induced a gradual microstructural refinement, accompanied by a two-stage phase transformation into TiO2 II phase and then rutile. Thin film electrodes were then prepared by depositing the processed powders on Ti supports from an organic suspension. The electrodes were successively exposed to irradiation with Hg lamps and the photoelectrochemical response of the powders evaluated in terms of efficiency of photocurrent generation. The experimental findings clearly show that the effi ciency of the photoelectrochemical response drops as the duration of mechanical treatment increases. A suitably developed model indicates that the observed efficiency decrease is mostly due to the formation of nanostructured phases consequent to the mechanical deformation at impacts.
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