Enhanced performance of low-cost dye-sensitized solar cells with pulse-electropolymerized polyaniline counter electrodes
Enhanced performance of low-cost dye-sensitized solar cells with pulse-electropolymerized polyaniline counter electrodes
复制标题
DOI：
10.1016/j.electacta.2012.12.055
复制
发表时间：
2013-02
影响因子：
6.6
通讯作者：
Yaoming Xiao;Jeng-Yu Lin;Wei-yan Wang;Sheng-Yen Tai;Gentian Yue;Jihuai Wu
中科院分区：
文献类型：
--
作者：
Yaoming Xiao;Jeng-Yu Lin;Wei-yan Wang;Sheng-Yen Tai;Gentian Yue;Jihuai Wu
采用脉冲恒电位电聚合法在氟化氧化锡（FTO）玻璃衬底上合成了表面粗糙的聚苯胺（PANI）纳米纤维，并首次将其作为低成本染料敏化太阳能电池（DSC）的无铂对电极（CE）。研究了不同脉冲参数对聚苯胺纳米纤维表面形貌的影响。优化后，在1.1V的脉冲开启电位、0V的脉冲反转电位、1s的脉冲开启周期、0.5s的脉冲反转周期和150s的脉冲持续时间下，可以得到直径为100nm的均匀分布的PANI纳米纤维。大量的循环伏安曲线表明，脉冲PANI CE不仅对I3 −还原具有上级电催化活性，而且具有优异的电化学稳定性。电化学交流阻抗测试表明，脉冲聚苯胺电极的串联电阻和电荷转移电阻均低于常规恒电位（I-t）电聚合法制备的聚苯胺电极。因此，与使用Pt CE的DSC相比，用脉冲PANI CE组装的DSC表现出5.19%的增强的光伏转换效率（与具有I-t PANI CE的DSC的4.35%相比）高达约90%的水平。因此，脉冲PANI CE可以被认为是低成本DSC的有前途的替代CE。
In this study, the pulse potentiostatic electropolymerization of anilines was employed in synthesizing polyaniline (PANI) nanofibers with rough surface morphology onto a fluorinated tin oxide (FTO) glass substrate as a Pt-free counter electrode (CE) for low-cost dye-sensitized solar cells (DSCs) for the first time. A variety of pulse parameters were investigated to control the surface morphology of PANI nanofibers. After the optimization, the well-distributed rough PANI nanofibers with the diameter of 100nm can be obtained under 1.1V pulse-on potential, 0V pulse-reversal potential, 1s pulse-on period, 0.5s pulse-reversal period, and total 150s duration time. The extensive cyclic voltammograms revealed that the pulsed PANI CE not only had superior electrocatalytic activity for I3−reduction, but also exhibited excellent electrochemical stability. Moreover, the electrochemical impedance spectroscopy showed the pulsed PANI CE had the relatively lower series resistance and charge-transfer resistance than those of the PANI CE prepared by the conventional potentiostatic (I–t) electropolymerization. Therefore, the DSC assembled with the pulsed PANI CE exhibited an enhanced photovoltaic conversion efficiency of 5.19% (compared to 4.35% for the DSC with the I–t PANI CE) up to ∼90% level of the DSC using the Pt CE. As the result, the pulsed PANI CE can be considered as a promising alternative CE for low-cost DSCs.