(375f) Boron-Modified TiO2 Microsphere With Enhanced Photovoltaic Performance | AIChE

(375f) Boron-Modified TiO2 Microsphere With Enhanced Photovoltaic Performance


Zhou, X. - Presenter, Nanjing University of Technology
Rao, J., Nanjing University of Technology

Nanotubes-assembled rutile TiO2 microspheres were successful prepared by a facile two-step hydrothermal approach in the presence of sodium metaborate tetrahydrate. SEM and FESEM micrographs revaled that the addition of boron enrichs the assembled nanorodes with a reduced diameter during hydrothermal process, probably result from the increased crystal defects induced more reaction sites for crystal growth after introduction of lots of boron compound. A slight shift to the left and weakened intensity of the diffraction peaks appeared in XRD pattern without obvious peaks for diboron trioxide evidenced the obtained rutile TiO2 accompanied with boron at interstitial sites. When applied to the photoanode of dye-sensitized solar cell, the photovoltaic device achieved a favorable photoelectricity conversion efficiency of 3%, which was 74% higher than that of the non-modified TiO2. Further investigation on the cells’ electrochemical properties were adopted by the impedance spectroscopy, which showed a longer electron lifetime and lower electron transfer rate at photoanode/dye/electrolyte interface compared to the pure TiO2 sample.