A Facile Synthetic Route of Titania Hollow Microspheres and its Inverse Opal Structure for Dye Sensitized Solar Cell Applications

• Main Author: 黃國聞
• Other Authors: 駱榮富
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/98715885994514552063

碩士 === 逢甲大學 === 材料科學與工程學系 === 101 === The main aims of this study are to use the emulsifier-free polymerization to produce polystyrene (PS) microspheres, which were used in the hard-templating method to form titania hollow microsphere. Furthermore, we prepared PS photonic crystal template via electrophoresis self-assembly (EPSA) method, sussequently such photonic crystal templates were used to form a titania inverse opal (TIO) structure via sol-gel method. Both independent titania hollow microspheres and TIO structure serve as the working electrodes in dye-sensitized solar cells (DSSCs) for studying the change of DSSC efficiency. The surfaces of PS microspheres derived from emulsifier-free polymerization with cationic initiator of 2,2,azobis(2-methylpropion a midine) dihydrochloride (AIBA) are associated with positive charges. In hard-templating method, titanium(IV) isopropoxide (TTIP) was used as precursor to produce TiO2/PS core shell microspheres to begin with PS microsphere templates. Finally, TiO2 hollow microspheres with anatase phase were obtained after calcination at 450oC to remove PS templates. Those TiO2 hollow microspheres derived from TTIP of 0.1 M concentration have rather higher specific surface area of 89.35 m2/g. The efficiency of DSSC with electrode of TiO2 hollow microsphere was 1.5 %, which was higher than that of electrode made of commercial titania P25 powders. The 3-D photonic crystal templates with opal structure were easily frabricated by EPSA technique. After voids of PS template were filled up with titania sol, TIO structures of anatase crystalline phase without any imputrities were successfully synthecized by removing the PS microspheres through pyrolysis and calcination. The results indicate that TIO has poor continuity, which led to rather low photoelectric conversion efficiency for DSSCs at 0.1% level.