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The present work studied the self-diffusion coefficient of 93Nb in Nb-doped TiO2 single crystal (4.3 at.% Nb) at high oxygen activity [p(O2) = 21 kPa] over the temperature range 1,073 to 1,573 K. The diffusion-induced 93Nb concentration profile was determined by using secondary ion mass spectrometry (SIMS). The subsequently determined self-diffusion coefficient of 93Nb exhibits the following temperature...
The present work reports the effect of light on the open-circuit voltage of a photoelectrochemical cell (PEC) formed of TiO2 photoanode, Pt cathode and Na2SO4 (0.35 M) aqueous solution as electrolyte. The studies included the measurements of the electromotive force (EMF) during the light-off and light-on cycles for the PEC involving photoanode that was made of both oxidised and reduced TiO2 thin films...
The present paper reports the reactivity between TiO2 and oxygen and the related charge transfer at 298 and 1,073 K. The studies were performed using work function measurements. It was found that oxidation of TiO2 at 1,073 K and p(O2) = 75 kPa, initially standardized at 1,173 K and p(O2) = 10 Pa, results in work function changes that are consistent with the theoretical model of the charge transfer...
The present work considers the gas/solid equilibration kinetics for nonstoichiometric oxides in general and TiO2 in particular. Several criteria that must be addressed in the determination of the chemical diffusion coefficient are outlined. The equilibration kinetics during oxidation and reduction are considered in terms of rate controlling reactions, including (1) bulk diffusion, (2) surface reaction,...
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