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Remarkable Progress in the Study of Photo-Catalysis
  English.dicp.cas.cn    Posted:2008-02-22

  Noticeable advance in the study of photo-catalysis for hydrogen production has been obtained recently by DICP researchers. The research team headed by Prof. LI Can, Member of CAS, has found that a kind of heterogeneous-phase junction formed by anatase and rutile on the surface of TiO2 can enhance the photo-catalytic activity of this material for hydrogen production. The results have been published in the journal of Angew. Chem. Int. Ed. (Importance of the Relationship between Surface Phases and Photocatalytic Activity of TiO2, Jing Zhang, Qian Xu, Zhaochi Feng, Meijun Li, Can Li, Published Online: Jan 22 2008 9:11AM, DOI: 10.1002/anie.200704788), and were cited by the C&E NEWS in its "Sci. & Tech. Concentrates" column.

  The relationship between the photo-catalytic properties and the surface crystalline phase structure of semi-conductor type photo-catalytic catalysts is an important research topic. However, this problem has not been clearly elucidated so far, especially for those of applied nano-scale photo-catalysts. By means of the newly developed UV-Raman Spectrometry technique, and in combination with other techniques such as HRTEM and XRD, the DICP team has been able to characterize systematically the surface phase as well as the bulk phase structures of nano-scale TiO2 particles prepared under various conditions. They found that when there were heterogeneous junctions formed on the surface of TiO2, its photo-catalytic activity for the yielding of hydrogen would be improved greatly. This finding is significant for the development of highly active photo-catalysts and their application in catalytic conversion technologies utilizing solar energy.



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