“学萃讲坛”第251期-Formation and Applications of Anodic Crystalline TiO2Mesoporous Films

发布时间:2014-10-08 浏览次数:483

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  报告题目:Formation and Applications of Anodic Crystalline TiO2Mesoporous Films
  报告人:辻悦司 助理教授
  时间:10月13日下午16:00-17:00
  地点:启航长江厅
  主办单位:科学技术研究院、“2011计划”办公室、国际交流与合作处
  承办单位:材料科学与化学工程学院
  报告人简介:北海道大学助理教授,主要从事光电催化,太阳能电池,表面电化学等领域的研究工作。2011年获日本大阪大学理学博士学位,2007年获日本大阪大学硕士学位,2005年获日本大阪大学学士学位。2008-2011年,日本学术振兴会JSPS研究员。
  报告内容简介:TiO2 is one of the most famous metal oxides which widely used for various applications such as photocatalysts, dye-sensitized solar cells (DSSC), antifog materials, electrochromic devices and so on. In general, amorphous TiO2 have a lot of defects which often act as recombination centers of photogenerated carries. Therefore, it is quite important to prepare highly crystalline TiO2 films. In addition, a high surface area of TiO2 is necessary for photocatalysts and DSSCs. Recently, TiO2nanotubular films (TNT) which have high surface area (pore size: about 20-200 nm) were formed by anodizing of titanium specimens in organic electrolytes containing fluorides. However, as-anodic films are highly contaminated with fluoride and carbon species derived from the electrolyte, leading to amorphous structures. Therefore, it is necessary for crystallization to post-annealing at more than 450ºC.On the other hand, more recently, we reported titanium could be also anodized in hot glycerol electrolytes containing phosphates and the obtained films showed unique properties. We revealed that the as-anodized films had mesoporous structures with pore diameters as small as ~10 nm, leading to quite high surface area. In addition, the films crystallized to anatase phase, even though it was not annealed after anodizing. In this study, I’ll report the detail properties of the anodic TiO2mesoporous films and photoelectrochemical applications such as photocatalysts and DSSCs.