An efficient dye-sensitized solar cell with a promising material of Bi4Ti3O12 nanofibers/graphene
An efficient dye-sensitized solar cell with a promising material of Bi4Ti3O12 nanofibers/graphene
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采用 Bi4Ti3O12 纳米纤维/石墨烯材料的高效染料敏化太阳能电池
DOI：
10.1016/j.electacta.2016.08.086
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发表时间：
2016-10
影响因子：
6.6
通讯作者：
Yin Guosheng
中科院分区：
文献类型：
--
作者：
Yu Yuhong;Zheng Haiwu;Zhang Xinan;Liang Xiao;Yue Gentian;Li Fengzhu;Zhu Mingsai;Li Tianfeng;Tian Jianjun;Yin Guosheng
本文采用溶胶-凝胶法和静电纺丝技术制备了Bi_4Ti_3O_（12）/石墨烯（BTO/Gr）复合材料作为对电极，以提高染料敏化太阳能电池（DSSC）的效率。采用X射线衍射、扫描电镜和透射电镜对不同配比的复合材料的结构和形貌进行了表征。复合材料的光学带隙随着Gr含量的增加而减小。通过循环伏安曲线、电化学阻抗谱、塔菲尔极化曲线和光电流密度-电压特性曲线表征了BTO/Gr CE的电化学性能。与纯BTO CE相比，BTO/Gr CE具有更高的电催化活性和更低的电解质/电极界面电荷转移电阻。具有BTO/Gr CE（含有2.5wt.% Gr），在100 mW/cm ~ 2的模拟太阳光照下，其吸收率达到9.70%，远大于BTO CE。功率转换效率相当于Pt CE的79.6%和石墨烯CE的86.2%。
In this work, the composites of Bi4Ti3O12/graphere (BTO/Gr) are used as counter electrode (CE) through facile method based on sol-gel and electrospinning techniques to improve the efficiency of dye-sensitized solar cells (DSSCs). The structure and morphology of the composites with different ratios are characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The optical bandgap of the composites decreases as Gr content increases. The electrochemical performance of BTO/Gr CE is characterized by cyclic voltammetry curves, electrochemical impedance spectroscopy, Tafel polarization curves and photocurrent density-voltage character curves. Compared with pure BTO CE, BTO/Gr CE has a higher electrocatalytic activity and a lower charge transfer resistance in the electrolyte/electrode interface. The power conversion efficiency of DSSCs with BTO/Gr CE (contained 2.5 wt.% Gr), has reached 9.70% under a simulated solar illumilnation of 100 mW/cm2, which is much larger than that of BTO CE. The power conversion efficiency amounts to 79.6% of the Pt CE and 86.2% of the graphene CE.
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