Multi-Shell Porous TiO2 Hollow Nanoparticles for Enhanced Light Harvesting in Dye-sensitized Solar Cells
Multi-Shell Porous TiO2 Hollow Nanoparticles for Enhanced Light Harvesting in Dye-sensitized Solar Cells
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DOI：
10.1002/adfm.201401915
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发表时间：
2014-12-23
影响因子：
19
通讯作者：
Jang, Jyongsik
中科院分区：
文献类型：
--
作者：
Hwang, Sun Hye;Yun, Juyoung;Jang, Jyongsik
工作电极中纳米材料的优化配置对于染料敏化太阳能电池（DSSC）的高性能至关重要。本文介绍了一种通过溶胶-凝胶反应、煅烧和刻蚀工艺制备多壳层TiO 2中空纳米粒子的方法。所制备的均匀MS-HNP具有高表面积（约100%）。171 m（2）g（-1）），多反射，电解质循环和扩散容易。在MS-HNP的制备过程中，SiO2前体和H2O在反应下的量对聚集和副反应具有显著影响。获得纯TiO 2的蚀刻过程受结晶度的影响。另外，合成单壳（SS）-TiO 2-HNP和双壳（DS）-TiO 2-HNP作为对照。与相同尺寸的SS-和DS-TiO 2-HNP相比，MS-TiO 2-HNP表现出高的表面积和增强的光反射率。优化的MS-TiO 2-HNP基DSSC的功率转换效率为9.4%，相比之下，SS-TiO 2-HNP-DSSC的效率为8.0%（提高了17.5%）。这些结果使得多功能MS-HNP能够用于能源材料应用，例如锂离子电池、光催化剂、水分解和超级电容器。
An optimized configuration for nanomaterials in working electrodes is vital to the high performance of dye-sensitized solar cells (DSSCs). Here, a fabrication method is introduced for multi-shell TiO2 hollow nanoparticles (MS-TiO2-HNPs) via a sol-gel reaction, calcination, and an etching process. The prepared uniform MS-HNPs have a high surface area (ca. 171 m(2) g(-1)), multireflection, and facile electrolyte circulation and diffusion. During the MS-HNP fabrication process, the amount of SiO2 precursor and H2O under reaction has a significant effect on aggregation and side reactions. The etching process to obtain pure TiO2 is influenced by anatase crystallinity. Additionally, single-shell (SS)-TiO2-HNPs and double-shell (DS)-TiO2-HNPs are synthesized as a control. The MS-TiO2-HNPs exhibit a high surface area and enhance light reflectance, compared with the SS-and DS-TiO2-HNPs of the same size. The power conversion efficiency of the optimized MS-TiO2-HNP-based DSSCs is 9.4%, compared with the 8.0% efficiency demonstrated by SS-TiO2-HNP-DSSCs (a 17.5% improvement). These results enable the utilization of multifunctional MS-HNPs in energy material applications, such as lithium ion batteries, photocatalysts, water-splitting, and supercapacitors.