Article history: Hierarchical TiO hollow microspheres were synthesized by a 2-step process consisting of thermal hydrol- Received 3 November 2015 ysis and subsequent solvothermal reaction. Quasi-monodispersed solid TiO microspheres aggregated by Received in revised form 2 February 2016 amorphous particles were ﬁrstly obtained by the controlled thermal hydrolysis of titanium sulfate, and Accepted 4 February 2016 then the solid structures transformed to hollow ones and crystallized during the subsequent solvothermal Available online 8 February 2016 treatment. SEM and TEM images of the samples revealed that the morphological evolution was in perfect accordance with the inside-out Ostwald ripening mechanism. The rich porosity and unique hierarchical Keywords: 2 −1 hollow structure endow the TiO microspheres with a large speciﬁc surface area of 108.0 m g . As an TiO hollow microspheres effective anode material for dye-sensitized solar cells, TiO hollow microspheres showed good capability Dye-sensitized solar cells of dye adsorption and strong light scattering, leading to a comparable energy conversion efﬁciency to the Ostwald ripening commercial 18NR-T transparent titania. Finally, a high efﬁciency of 7.84% was achieved for the bi-layer Scattering Photoelectrochemical efﬁciency DSSC by coating the hollow microspheres on top of the 18NR-T titania as the light scattering layer. ©
Applied Surface Science – Elsevier
Published: Apr 30, 2016
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