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Enhanced photoelectrochemical activity for Cu and Ti doped hematite: The first principles calculations

2011; American Institute of Physics; Volume: 98; Issue: 11 Linguagem: Inglês

10.1063/1.3567766

1520-8842

Xiangying Meng, Gaowu Qin, Song Li, Xiaohong Wen, Y. P. Ren, Wenbin Pei, Liang Zuo,

Copper-based nanomaterials and applications

To improve photoelectrochemical (PEC) activity of hematite, the modification of energy band by doping 3d transition metal ions Cu and Ti into α-Fe2O3 were studied via the first-principles calculations with density function theory (DFT)+U method. The results show that the band gap of hematite is ∼2.1 eV and n-type dopant Ti improves the electric conductivity, confirmed by recent experiments. The p-type dopant Cu enhances the utilization ratio of solar energy, shifts both valance, and conduction band edges to a higher energy level, satisfying hydrogen production in the visible light driven PEC water splitting without voltage bias.