An efficient dye-sensitized solar cell with a promising material of Bi₄Ti₃O₁₂ nanofibers/graphene

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• 作者：Yuhong Yu ; Haiwu Zheng ; ^{zhenghaiw@ustc.edu" class="auth_mail" title="E-mail the corresponding author} ; ^{zhenghaiw@ustc.edu" class="auth_mail" title="E-mail the corresponding author} ; Xinan Zhang ; Xiao Liang ; Gentian Yue ; ^{yuegentian@126.com" class="auth_mail" title="E-mail the corresponding author} ; Fengzhu Li ; Mingsai Zhu ; Tianfeng Li ; Jianjun Tian ; Guosheng Yin
• 关键词：Bi4Ti3O12 ; Graphene ; Counter Electrode ; Dye-sensitized Solar Cells
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 October 2016
• 年：2016
• 卷：215
• 期：Complete
• 页码：543-549
• 全文大小：1731 K

文摘

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.