By Jan Augustynski (auth.)

Contents: J. Augustynski, Genève/Switzerland: Aspects of Photo-electrochemical and floor Behaviour of Titanium(IV) OxideR. Reisfeld, Jerusalem/Israel, C.K. Jorgensen, Genève/Switzerland: Excited States of Chromium(III) in Translucent Glass-Ceramics as potential Laser MaterialsH.D. Lutz, Siegen/FRG: Bonding and constitution of Water Molecules in good Hydrates. Correlation of Spectroscopic and Structural DataJ. Augustynski, Genève/Switzerland: Aspekte der photoelektrochemischen und katalytischen Eigenschaften des Titan(IV)oxidsR. Reisfeld, Jerusalem/Israel, C.K. Jorgensen, Genève/Switzerland: Angeregte Zustände des Chrom(III) in durchscheinenden Glaskeramiken als mögliche LasermaterialienH.D. Lutz, Siegen/FRG: Bindung und Struktur der Wassermoleküle in festen Hydraten. Zusammenhang zwischen spektroskopischen undstrukturellen Daten

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Consequently, the amount of the saturation photocurrent is no more controlled by the kinetics of the various surface processes but exclusively by the effective light intensity and the solid-state properties of the outermost (in general thinner than 1 ~tm) layer of the semiconductor 19. Therefore, it is the analysis of the anodic photocurrents in the range of potentials close to the flat-band potential 2° which may provide useful information about the kinetics of the competitive photoreactions at TiOz.

The prepolarization of the TiO2 electrode, leading to the steady-state coverage by the surface-bonded peroxides, is shown to cause a perceptible decrease of the quantum efficiency of the photocurrent (curve A). Curve B in Fig. 16 has been obtained under identical conditions and for the same TiO2 electrode made practically free from the peroxo species. 8 V more positive than the flat-band potential of anatase) the surface electron-hole recombination becomes negligible, the observed diminution of the photocurrent (attaining, in Fig.

This contrasts with the behaviour of such photocatalysts as zinc oxide or cadmium sulfide for which the addition of catalase was effective in detecting H202 accumulating in the solution during the photo-uptake of oxygen158'161). It is symptomatic in this regard that, unlike TiO2, both ZnO and CdS tend to photo-corrode when exposed to water in the presence of UV light. The H202 formation at the photoanode has been proposed to account for the observed volume ratio of the evolved oxygen to hydrogen lower than 1:2162' 163).

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