In this work, the impact of alkali concentration on the formation of novel one dimensional TiO₂ nanostructures has been studied. The variation of alkali concentration resulted in the change of morphology and structure of P25 nanoparticle precursors under hydrothermal conditions, as confirmed by scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) nitrogen adsorption–desorption, X-ray diffraction (XRD) and photoluminescence (PL) spectroscopy. The effects of the annealing temperatures on the surface oxygen vacancies were also studied under various temperatures. In higher NaOH concentrations under annealing, these nanostructures have a peculiar appearance consisting in nanorods with nanoparticles grown on their surface and hence designated herein as “integrated TiO₂ nanorods”. The prepared nanostructures were employed as main precursors of photoanode and their performance was fully investigated in dye-sensitized solar cells (DSSCs). TiO₂ nanostructures prepared from 12 M alkaline solution at 300 °C had the largest specific surface area (363.15 m²/g) and the best efficiency improvement was about 41% for these TiO₂ nanostructures compared to the P25 nanoparticles.

在这项工作中，研究了碱浓度对新型一维TiO ₂纳米结构形成的影响。碱金属浓度的变化导致水热条件下P25纳米颗粒前体的形貌和结构发生变化，这已通过扫描电子显微镜（SEM），Brunauer-Emmett-Teller（BET）氮吸附-解吸，X射线衍射（XRD）得以证实。 ）和光致发光（PL）光谱。还研究了在不同温度下退火温度对表面氧空位的影响。在退火下较高的NaOH浓度下，这些纳米结构具有特殊的外观，其特征在于纳米棒表面上生长有纳米颗粒，因此在本文中称为“集成的TiO ₂纳米棒”。制备的纳米结构被用作光阳极的主要前体，并在染料敏化太阳能电池（DSSC）中对其性能进行了充分研究。在300°C下由12 M碱性溶液制备的TiO ₂纳米结构具有最大的比表面积（363.15 m ² / g），与P25纳米颗粒相比，这些TiO ₂纳米结构的最佳效率提高约为41％。