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Fibrous anatase TiO 2 nanotubes-aggregated porous microspheres (AMS) with high specific surface area (160 m 2 g À1) were fabricated through an alkali solution-assisted hydrothermal process followed by an acid post-treatment and a calcination by using commercial TiO 2 nanopowder (P25) as raw material. The resultant AMS microspheres with an average diameter of $ 5 lm have three-dimensional network-like porous structures formed by accumulation and winding of fibrous TiO 2 nanotubes with diameter < 10 nm. When used as photoanode materials of Ti foil-based quasi-solid state dye-sensitized solar cells, the AMS film-based solar cell gives a conversion efficiency of 7.16% with 34% improvement when compared to the P25 film-based one (5.34%).

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