Electrospun Carbon Nanofibers as Low-Cost Counter Electrode for Dye-Sensitized Solar Cells
Electrospun Carbon Nanofibers as Low-Cost Counter Electrode for Dye-Sensitized Solar Cells
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DOI：
10.1021/am100742s
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发表时间：
2010-12-01
影响因子：
9.5
通讯作者：
Qiao, Qiquan
中科院分区：
文献类型：
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作者：
Joshi, Prakash;Zhang, Lifeng;Qiao, Qiquan
在染料敏化太阳能电池（dsc）中，电纺碳纳米纤维（ECNs）作为一种电催化剂和低成本的铂（Pt）替代品被探索。电化学阻抗谱（EIS）和循环伏安法测量结果表明，ECN对电极具有低电荷转移电阻（R-ct）、大电容(C)和快速还原三碘化物的反应速率。虽然ecn基电池的效率（eta）略低于pt基电池，但其短路电流密度（J(sc)）和开路电压（V-oc）相当。基于ecn的电池在100mw cm（-2）的AM 1.5照明下实现了5.5%的能量转换效率（eta）。使用ECN电极的电池性能较低的原因是其填充因子（FF）低于基于pt的电池，这可能是由于总串联电阻（R-Stot）较高，约为15.5 Omega cm(2)，大于基于pt的器件的4.8 Omega cm(2)。模拟结果表明，减小R-Stot可以显著提高填充因子（FF）和eta，而减小R-Stot可以通过使用更薄和高多孔的ECNs来减小ECNs对电极的厚度来实现。
Electrospun carbon nanofibers (ECNs) have been explored as an electrocatalyst and low-cost alternative to platinum (Pt) for triiodide reduction in dye-sensitized solar cells (DSCs). The results of electrochemical impedance spectroscopy (EIS) and cyclic voltammetry measurements indicated that the ECN counter electrodes exhibited low charge-transfer resistance (R-ct), large capacitance (C), and fast reaction rates for triiodide reduction. Although the efficiency (eta) of ECN-based cells was slightly lower than that of Pt-based cells, their short circuit current density (J(sc)) and open circuit voltage (V-oc) were comparable. The ECN-based cells achieved an energy conversion efficiency (eta) of 5.5 % under the AM 1.5 illumination at 100 mW cm(-2). The reason for lower cell performance using the ECN electrode was because of its lower fill factor (FF) than that of Pt-based cells, probably caused by high total series resistance (R-Stot) at similar to 15.5 Omega cm(2), which was larger than that of similar to 4.8 Omega cm(2) in the Pt-based devices. Simulated results showed that the fill factor (FF) and eta could be substantially improved by decreasing R-Stot, which might be achieved by using thinner and highly porous ECNs to reduce the thickness of the ECNs counter electrode.