Prediction of (TiO2)x(Cu2O)y alloys for efficient photoelectrochemical water splitting
Literature Information
Heng-Rui Liu, Ji-Hui Yang, Yue-Yu Zhang, Shiyou Chen, Aron Walsh, Hongjun Xiang, Xingao Gong, Su-Huai Wei
The formation of (TiO2)x(Cu2O)y solid-solutions is investigated using a global optimization evolutionary algorithm. First-principles calculations based on density functional theory are then used to gain insight into the electronic properties of these alloys. We find that: (i) Ti and Cu in (TiO2)x(Cu2O)y alloys have similar local environments as in bulk TiO2 and Cu2O except for (TiO2)(Cu2O) which has some trigonal-planar Cu ions. (ii) The predicted optical band gaps are around 2.1 eV (590 nm), thus having much better performance in the absorption of visible light compared with both binary oxides. (iii) (TiO2)2(Cu2O) has the lowest formation energy amongst all studied alloys and the positions of its band edges are found to be suitable for solar-driven water splitting applications.
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