Au/TiO2 nanotube array based multi-hierarchical architecture for highly efficient dye-sensitized solar cells
Au/TiO2 nanotube array based multi-hierarchical architecture for highly efficient dye-sensitized solar cells
复制标题
基于 Au/TiO2 纳米管阵列的多层次结构，用于高效染料敏化太阳能电池
DOI：
10.1016/j.jpowsour.2019.227076
复制
发表时间：
2019
影响因子：
9.2
通讯作者：
Lin Yuan
中科院分区：
文献类型：
--
作者：
Fu Nianqing;Jiang Xiongzhuo;Chen Dongchu;Duan Y;ong;Zhang Guoge;Chang Menglei;Fang Yanyan;Lin Yuan
控制平衡的高光捕获和有效的电荷传输对于光电化学应用至关重要，但仍然是巨大的挑战。我们在这里开发了单壁二氧化钛纳米管阵列与原位沉积Au纳米粒子。在此基础上，通过真空辅助胶体填充的方法，进一步构建了“雪茄状”的Au/TiO 2-nanotube-array/TiO 2-nanoparticles多层结构，并应用于染料敏化太阳能电池。在这种复杂的结构中，焊接在纳米管壁上的Au纳米颗粒起到了双重作用，即直接将热电子注入到TiO 2中以将TiO 2膜的电导率提高约4倍（在光照下）以实现快速电子传输，并引入等离子体效应以改善光捕获。同时，厚的TiO 2纳米颗粒装饰为光阳极提供了广阔的表面积，约为原始TiO 2纳米管阵列电极的染料负载量的3.2倍，这将进一步显着提高光捕获。由此产生的染料敏化太阳能电池产生了令人印象深刻的8.93%，这是190.4%的原始的二氧化钛纳米管阵列为基础的设备的高功率转换效率。该技术为制备具有广泛应用前景的多层次结构提供了良好的前景，如电致发光和气敏传感器。
Control over balanced high light-harvesting and efficient charge transport is of crucial importance for photoelectrochemical applications but still remains great challenge. We develop here single-wall TiO2nanotube array with in-situ deposited Au nanoparticles. Based on this Au–TiO2hybrid, we further build a “cigar-like” Au/TiO2-nanotube-array/TiO2-nanoparticles multi-hierarchical architecture through a novel vacuum-assisted colloid-filling approach for dye-sensitized solar cell application. In this elaborate structure, Au nanoparticles welding on nanotube walls play dual roles of direct injecting hot electrons into TiO2to elevate the conductivity of TiO2film by about 4 times (under illumination) for fast electron transport, and introducing a plasmonic effect to improve light-harvesting as well. Meanwhile, the thick TiO2nanoparticulate decoration provides the photoanode vast surface area for ~3.2 times the dye-loading amount of the pristine TiO2nanotube array based electrode, which will further boost the light-harvesting remarkably. The resulting dye-sensitized solar cell yields an impressively high power conversion efficiency of 8.93%, which is 190.4% that of the pristine TiO2nanotube array based device. The technology presented in this work provides also a promising prospect for the preparation of multi-hierarchical structures for a wide range of applications, such as photocatalysis and gas sensors.