Facile synthesis of rutile TiO2 nanorod microspheres for enhancing light-harvesting of dye-sensitized solar cells
Facile synthesis of rutile TiO2 nanorod microspheres for enhancing light-harvesting of dye-sensitized solar cells
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DOI：
10.1039/c2ce26691a
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发表时间：
2013-01
期刊：
影响因子：
3.1
通讯作者：
Y. Rui;Yaogang Li;Qinghong Zhang;Hongzhi Wang
中科院分区：
文献类型：
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作者：
Y. Rui;Yaogang Li;Qinghong Zhang;Hongzhi Wang
通过盐辅助水热法合成了直径为500-700 nm、比表面积为63.7 m2 g-1的亚微米级金红石型TiO 2纳米棒微球。形貌演化作为反应时间的函数进行洞察的纳米棒微球的形成机制。与传统的块状金红石型TiO 2颗粒不同，纳米棒微球作为染料敏化太阳能电池（DSSC）的散射覆盖层，可以提供吸附染料分子和强捕光效率的双重功能。此外，如电化学阻抗谱所证实的，固有的纳米棒将为电荷转移提供优良的电子渗滤途径。因此，具有散射覆盖层的DSSC的电池效率（7.32%）比没有散射覆盖层的DSSC（5.28%）提高了39%，并且效率也略高于相同厚度仅由纳米晶组成的DSSC（7.14%）。
Sub-micrometer sized rutile TiO2 nanorod microspheres with diameters of 500–700 nm and with a specific surface area of 63.7 m2 g−1 were synthesized via a salt-assisted hydrothermal method. Morphological evolution as a function of reaction time was carried out to gain insight into the formation mechanism of the nanorod microspheres. Unlike traditional bulk rutile TiO2 particles, the nanorod microspheres could provide dual-functions of adsorbing dye molecules and strong light-harvesting efficiency when they were fabricated as a scattering overlayer in dye-sensitized solar cells (DSSCs). Furthermore, the inherent nanorods would provide excellent electron percolation pathways for charge transfer as confirmed by electrochemical impedance spectroscopy. Consequentially, DSSC with the scattering overlayer exhibited a 39% increment of cell efficiency (7.32%) compared with the DSSC without one (5.28%), and the efficiency was also a little higher than the DSSC with the same thickness composed of only nanocrystallites (7.14%).