The electronic and optical properties of Fe or/and Ni (co)doped anatase and rutile TiO2 were investigated using the spin-polarized density functional theory. Our calculated results indicate that the synergistic effect of (Fe + Ni) codoping can lead to a band gap narrowing and the hybridized states of Fe 3d and Ni 3d appearing in the forbidden gap, which enhances greatly the optical absorption of TiO2 nanomaterials from the ultraviolet-light to the infrared-light region and reduces the recombination of photogenerated electron hole pairs. In particular, (Fe + Ni) codoping can improve greatly the infrared-light absorption of TiO2 nanomaterials. Furthermore, the researches of electronegativity show that (Fe + Ni)codoped TiO2 system has a stronger redox power for hydrogen generation by photo catalytic water splitting compared with pure, Fe-doped, and Ni-doped TiO2 systems. These results lead to an outstanding solar energy photocatalytic water splitting for hydrogen generation in (Fe + Ni)-codoped TiO2 photocatalyst. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
- TiO2; Codoping; Photocatalytic water splitting for hydrogen generation; Density functional theory
- NI-DOPED TIO2; CODOPED TIO2; AB-INITIO; HYDROGEN EVOLUTION; RUTILE TIO2; ANATASE; NANOPARTICLES; FE; DEGRADATION; PERFORMANCE
Lin, Y., Jiang, Z., Zhu, C. Y., Zhang, R., Hu, X., Zhang, X., Zhu, H., & Lin, S. H. (2017). The electronic structure, optical absorption and photocatalytic water splitting of (Fe plus Ni)-codoped TiO2: A DFT + U study. International Journal of Hydrogen Energy, 42(8), 4966-4976. https://doi.org/10.1016/j.ijhydene.2016.06.077