Effect of Nb(V) Doping on the Structure and Oxygen Chemisorption on Nanocrystalline TiO2

This work is devoted to the study of the effect of niobium doping on the structural characteristics and chemisorption of oxygen on the TiO2 surface. Pure and Nb doped TiO2 was obtained by flame spray pyrolysis and characterized using SEM, TEM, XRD, low-temperature nitrogen adsorption XRF, XPS, TPR-H-2 methods. The introduction of niobium stabilizes the anatase phase, increases the specific surface area of TiO2 and the concentration of chemisorbed oxygen. By in situ conductivity measurements depending on the oxygen partial pressure, it is shown that an increase in the Nb concentration leads to the growth of the fraction of chemisorbed oxygen with a lower effective charge.