A Green, Low-Cost and Efficient Photocatalyst: Atomic-Hydrogenated alpha-Fe2O3

作者：Xiang Qing Yun; Cao Jiang Li; Li Yue; Huang Ya Li; Shi Yu; Wang Jie; Mo Li Bin; Yao Wen Qing

来源：Catalysis Surveys from Asia, 2016, 20(3): 133-140.

DOI：10.1007/s10563-016-9214-x

• Hematite
• Atomic-hydrogenation
• Photocatalytic
• First principles calculation

The environmental-friendly hematite iron oxide (alpha-Fe2O3) has important application prospects in the photocatalysis field owing to its narrow indirect band gap. Here, we report a band gap engineering of alpha-Fe2O3 by incorporation of electrochemically-generated atomic hydrogen at moderate conditions. The ultraviolet-visible spectra show the reduction of the alpha-Fe2O3 band gap after hydrogenation and the absorption region from 200-800 nm is enhanced, especially in the visible light region. First principles calculation reveals the mixing of the new hybrid energy level with the valence band top resulting in a decrease in the band gap of alpha-Fe2O3. Further photocatalytic degradation experiments of dyes demonstrate that the photocatalytic efficiency of alpha-Fe2O3 can be greatly enhanced by the atomic hydrogen incorporation. The hydrogenated alpha-Fe2O3 can be easily recycled by magnets and has good photocatalytic stability. These findings offer possibilities for utilizing this inexpensive and earth-abundant oxide materials in the pollution controlling areas.

• 出版日期2016-9
• 单位中国科学院; 中国科学院电工研究所; 清华大学; 北京科技大学