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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Facile Synthesis and Morphology Control of Bamboo-Type TiO2 Nanotube Arrays for High-Efficiency Dye-Sensitized Solar Cells
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Facile Synthesis and Morphology Control of Bamboo-Type TiO2 Nanotube Arrays for High-Efficiency Dye-Sensitized Solar Cells

机译：用于高效染料敏化太阳能电池的竹型TiO2纳米管阵列的简便合成和形态学控制

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摘要

We report fast synthesis of bamboo-type TiO2 nanotube arrays via anodization of Ti in nonhazardous electrolyte under alternating voltage condition for applications as photoanodes in high-efficiency dye-sensitized solar cells (DSSCs). Formation mechanism of bamboo-type nanotubes is also explored. The low-voltage step reduces pH and ion-difiiision gradient inside TiO2 nanotubes and induces formation of bamboo ridges on outer tube walls when a second high-voltage step is conducted. Ridge spacing and length of bamboo-type nanotubes can be facilely tuned by adjusting time of high-voltage step and electrolyte composition. All DSSCs based on bamboo-type TiO2 nanotube arrays show higher efficiencies than those based on smooth-walled nanotubes with the same tube length due to enhanced surface area of bamboo-type nanotubes for dye loading. It is also noted that DSSC efficiency increases with the ridge density of bamboo-type nanotubes of the same length. For example, DSSC based on bamboo-type nanotubes (8 μm long) with the highest ridge density exhibits an efficiency of 5.64%, higher than the efficiency of 3.90% exhibited by DSSC based on smooth-walled nanotubes of the same length. Moreover, the DSSC efficiency can be further increased to 6.8% by growing significantly longer bamboo-type TiO2 nanotubes (16.5 μm long) via decreasing water content in electrolyte.
机译：我们报告通过交流电在无害电解质中通过在无害电解质中进行Ti的阳极氧化来快速合成竹型TiO2纳米管阵列，以用作高效染料敏化太阳能电池（DSSCs）中的光阳极。还研究了竹型纳米管的形成机理。当执行第二个高压步骤时，低压步骤会降低TiO2纳米管内部的pH值和离子扩散梯度，并导致在外管壁上形成竹脊。竹型纳米管的脊间距和长度可以通过调节高压阶跃的时间和电解质组成来方便地调节。与基于相同管长的光滑壁纳米管的所有DSSC相比，基于竹型TiO2纳米管阵列的所有DSSC都具有更高的效率，这是由于竹型纳米管用于染料加载的表面积增加了。还应注意，DSSC效率随相同长度的竹型纳米管的脊密度而增加。例如，具有最高脊密度的基于竹型纳米管（长8μm）的DSSC的效率为5.64％，高于基于相同长度的光滑壁纳米管的DSSC的3.90％的效率。此外，通过降低电解质中的水分含量，通过生长更长的竹制TiO2纳米管（长16.5μm），可以将DSSC效率进一步提高到6.8％。

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