Time-Dependent Density Functional Theory Calculations of N- and S-Doped TiO(2) Nanotube for Water-Splitting Applications

On the basis of time-dependent density functional theory (TD-DFT) we performed first-principle calculations to predict optical properties and transition states of pristine, N- and S-doped, and N+S-codoped anatase TiO [Formula: see text] nanotubes of 1 nm-diameter. The host O atoms of the pristine TiO [Formula: see text] nanotube were substituted by N and S atoms to evaluate the influence of dopants on the photocatalytic properties of hollow titania nanostructures. The charge transition mechanism promoted by dopants positioned in the nanotube wall clearly demonstrates the constructive and destructive contributions to photoabsorption by means of calculated transition contribution maps. Based on the results of our calculations, we predict an increased visible-light-driven photoresponse in N- and S-doped and the N+S-codoped TiO [Formula: see text] nanotubes, enhancing the efficiency of hydrogen production in water-splitting applications.