科研之友
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摘要
We theoretically forecasted the narrowness of band gap for the nitrogen doped ZrO2, implying a possible energy level matching at the interface between TiO2 and ZrO2. Inspired by the theoretical simulation, the corresponding experiment was carried out and the band gap of ZrO2 is narrowed by doping nitrogen in substitutional mode. The TiO2N/ZrO(2)xNx composite photocatalyst exhibited an excellent photocatalytic performance under visible-light irradiation. The enhancement is caused by the introduction of doping energy level as well as the electrons transition at interface, which would enhance the visible absorption of composite photocatalyst and separate the photogenerated charge carriers efficiently. These results suggest that the selection of materials and dopants and the matching of energy levels at interface are of great importance to design and fabricate photocatalysts with high efficiency and performance.
