He Xiong, Zhang Jingyu, Guo Yan, Liu Jinghua, Li Xin
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 150090 China
State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology Harbin 150090 China.
RSC Adv. 2019 Jan 23;9(6):3056-3062. doi: 10.1039/c8ra09145e. eCollection 2019 Jan 22.
Hierarchical TiO microspheres composed of nanoparticle-decorated nanorods (NP-MS) were successfully prepared with a two-step solvothermal method. There were three benefits associated with the use of NP-MS as a photoanode material. The decoration of nanoparticles improved the specific surface area and directly enhanced the dye loading ability. Rutile nanorods serving as electron transport paths resulted in fast electron transport and inhibited the charge recombination process. The three-dimensional hierarchical NP-MS structure supplied a strong light scattering capability and good connectivity. Thus, the hierarchical NP-MS combined the beneficial properties of improved scattering capability, dye loading ability, electron transport and inhibited charge recombination. Attributed to these advantages, a photoelectric conversion efficiency of up to 7.32% was obtained with the NP-MS film-based photoanode, resulting in a 43.5% enhancement compared to the efficiency of the P25 film-based photoanode (5.10%) at a similar thickness. Compared to traditional photoanodes with scattering layers or scattering centers, the fabrication process for single layered photoanodes with enhanced scattering capability was very simple. We believe the strategy would be beneficial for the easy fabrication of efficient dye-sensitized solar cells.
采用两步溶剂热法成功制备了由纳米粒子修饰的纳米棒组成的分级TiO微球（NP-MS）。将NP-MS用作光阳极材料有三个好处。纳米粒子的修饰提高了比表面积并直接增强了染料负载能力。作为电子传输路径的金红石纳米棒导致快速的电子传输并抑制了电荷复合过程。三维分级NP-MS结构提供了强大的光散射能力和良好的连通性。因此，分级NP-MS结合了改善的散射能力、染料负载能力、电子传输和抑制电荷复合的有益特性。由于这些优点，基于NP-MS薄膜的光阳极获得了高达7.32%的光电转换效率，与类似厚度的基于P25薄膜的光阳极（5.10%）的效率相比提高了43.5%。与具有散射层或散射中心的传统光阳极相比，具有增强散射能力的单层光阳极的制造过程非常简单。我们相信该策略将有利于高效染料敏化太阳能电池的简便制造。
