Adjustment and Control of Energy Levels for TiO2鈥揘/ZrO2鈥?i>xNx with Enhanced Visible Light Photocatalytic Activity

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• 作者：Yanlong Yu ; Peng Zhang ; Yuanjiang Kuang ; Yihong Ding ; Jianghong Yao ; Jingjun Xu ; Yaan Cao
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：September 11, 2014
• 年：2014
• 卷：118
• 期：36
• 页码：20982-20988
• 全文大小：362K
• ISSN：1932-7455

文摘

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 TiO₂鈥揘/ZrO_2鈥?i>xN_x 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鈥?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.