Abstract
The construction of nanocrystals with controllable composition and desirablemicro-nanostructures is a well-known challenge. A combination of favorable composition andoptimized micro-nanostructures can enhance the performance of a material significantly. UsingTiO2 as an example, we demonstrate here a facile approach to prepare anatase/rutile mixed-phaseTiO2 hollowmicro-nanospheres with hierarchical mesopores. Our strategy relies on polymer-assisted assembly of ∼ 5 nm nano-building blocks into three-dimensional hierarchical hollow micro-nanospheresin a mixed alcohol–water solution. This superior micro-nanostructure endowsthe sample with hierarchical mesopores and a high surface area of 106 m2 g − 1. We also show that, due to the synergetic effects of the mixed-phase composition and themicro-nanostructures, the sample exhibited significantly improved photovoltaicperformance and similar photocatalytic performance compared with the commercialDegussa P25. These results suggested that our sample has great potential for futurephotovoltaic and photocatalytic applications.
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