Simple preparation of lotus-root shaped meso-/macroporous TiO₂ and their DSSC performances.
Simple preparation of lotus-root shaped meso-/macroporous TiO₂ and their DSSC performances.
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DOI：
10.1016/j.jcis.2015.02.058
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发表时间：
2015-06
影响因子：
9.9
通讯作者：
Jin-Yeon Hong;Sang-Eun Bae;Y. Won;S. Huh
中科院分区：
文献类型：
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作者：
Jin-Yeon Hong;Sang-Eun Bae;Y. Won;S. Huh
为了追求用于染料敏化太阳能电池（DSSC）的优质 TiO2 光阳极材料，我们制备了莲花根形介孔/大孔 TiO2。通过在水溶液中使用十六烷基三甲基氢氧化铵（CTAOH）模板，可以轻松制备莲花根形介孔/大孔 TiO2。所制备的无定形莲花根状 TiO2 的结晶是在 700°C 的空气中进行的。在 700 °C 热处理后，生成了含有极少量金红石相的结晶锐钛矿相，并且结晶莲藕状介孔/大孔 TiO2 材料 (LR-700) 的 BET 表面积为 30.0 m2g−1。 LR-700 的壁显示出发达的介孔性，孔径为 28.3 nm。在颗粒中还观察到周期性排列的微米级一维（1D）大孔。检查了 Grätzel 型 DSSC 中 LR-700 光电阳极的光子到电流的转换效率 (η)。通过混合纳米颗粒赢创 P25 和 LR-700（质量比 = 85:150）制备的 DSSC 的转换效率比使用 P25 的参比电极高 28%。通过采用由 P25 和 LR-700 混合物组成的光电阳极，DSSC 的入射光子电流效率 (IPCE) 得到显着提高，但阻抗分析表明 P25/LR-700 混合电池的电阻与标准 P25 参考电池相似。因此，通过使用由 LR-700 和纳米晶 P25 颗粒组成的混合光电阳极，可以提高染料吸收和外部量子效率，从而提高光伏性能。
In pursuit of superior TiO2photoanode materials for dye-sensitized solar cells (DSSCs), we prepared lotus-root shaped meso-/macroporous TiO2. The lotus-root shaped meso-/macroporous TiO2was easily prepared by using a cetyltrimethylammonium hydroxide (CTAOH) template in aqueous solution. The crystallization of the as-prepared amorphous lotus-root shaped TiO2was performed at 700 °C in air. Crystalline anatase phase with a very small portion of rutile phase was generated after the heat treatment at 700 °C and the BET surface area of crystalline lotus-root shaped meso-/macroporous TiO2material (LR-700) was 30.0 m2g−1. The wall of LR-700 displayed well-developed mesoporosity with a pore dimension of 28.3 nm. Periodically arranged microscale one-dimensional (1D) macropores were also observed in the particles. The photon-to-current conversion efficiencies (η) of LR-700 photoanodes in Grätzel type DSSCs were examined. The conversion efficiency of DSSC prepared by mixing nanoparticulate Evonik P25 and LR-700 (ratio = 85:150 by mass) was 28% greater compared to the reference electrode using P25. Incident photon-to-current efficiencies (IPCE) of the DSSCs were dramatically improved by employing the photoanodes composed of a mixture of P25 and LR-700 but impedance analysis indicated that P25/LR-700 mixed cells have resistances similar to the standard P25 reference cell. Thus, photovoltaic performances could be improved mainly due to the increases of dye uptake and external quantum efficiency by using a mixed photoanode composed of LR-700 and nanocrystalline P25 particles.