Xiao Jiajia, Li Po, Wen Xiaogang
College of Materials Science and Engineering, Sichuan University, Chengdu 610064, Sichuan, People's Republic of China.
Nanotechnology. 2018 Apr 27;29(17):175603. doi: 10.1088/1361-6528/aaaf81. Epub 2018 Feb 15.
Novel jujube-like hierarchical TiO microspheres (HTMs) were synthesized by an alkali-corrosion process of titanium phosphate (TiO(HPO) · 2HO) microspheres. The hierarchical titanium phosphate microsphere (HTPM) intermediates consisting of nanoflakes with a thickness of 20 nm were firstly prepared by a facile hydrothermal method. After reacting with diluted NaOH at low temperature and atmospheric pressure, followed by subsequent acid washing and a calcination process, the HTPM intermediates were transformed to TiO with the microsphere morphology well retained, while the nanoflakes became porous, and some new nanowires were formed between the nanoflakes. Finally, HTMs consisting of porous nanoflakes and nanowires were obtained. The possible growth mechanisms of HTPMs and HTMs are discussed. The HTMs demonstrate high specific surface area and excellent light-scattering ability. The performance of the dye sensitized solar cells (DSSCs) of the HTMs synthesized under different conditions is studied, and a total conversion efficiency of up to 8.93% was obtained. The improved DSSC performance was attributed to the enhanced dye loading, light-scattering, and charge transporting ability of the HTMs with a unique hierarchical nanostructure.
通过磷酸钛（TiO(HPO)₂·2H₂O）微球的碱腐蚀过程合成了新型枣状分级TiO微球（HTMs）。首先通过简便的水热法制备了由厚度为20 nm的纳米片组成的分级磷酸钛微球（HTPM）中间体。在低温常压下与稀释的NaOH反应，随后进行酸洗和煅烧过程后，HTPM中间体转变为TiO，微球形态得到良好保留，而纳米片变得多孔，并且在纳米片之间形成了一些新的纳米线。最终，获得了由多孔纳米片和纳米线组成的HTMs。讨论了HTPMs和HTMs可能的生长机制。HTMs具有高比表面积和出色的光散射能力。研究了在不同条件下合成的HTMs对染料敏化太阳能电池（DSSC）的性能，获得了高达8.93%的总转换效率。DSSC性能的提高归因于具有独特分级纳米结构的HTMs增强的染料负载、光散射和电荷传输能力。
