Carbon nanofiber-based counter electrodes for low cost dye-sensitized solar cells
Carbon nanofiber-based counter electrodes for low cost dye-sensitized solar cells
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DOI：
10.1016/j.jpowsour.2013.10.142
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发表时间：
2014-03
影响因子：
9.2
通讯作者：
D. Sebastián;V. Baglio;M. Girolamo;R. Moliner;M. Lázaro;A. Aricò
中科院分区：
文献类型：
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作者：
D. Sebastián;V. Baglio;M. Girolamo;R. Moliner;M. Lázaro;A. Aricò
碳材料是染料敏化太阳能电池（DSSC）反电极中铂的一个有吸引力的替代品，有助于有效地将太阳能转化为电能。通过分析高石墨化碳纳米纤维的长丝直径、比表面积和石墨化程度对DSSC阴极性能的影响，研究了高石墨化碳纳米纤维的应用。为此，采用透射电镜（TEM）、x射线衍射（XRD）、拉曼光谱（Raman spectroscopy）和物理吸附分析（physical absorption analysis）对CNFs的主要性质进行了表征。利用极化实验和电化学阻抗谱研究了CNFs作为DSSC中对电极的行为。在不同的材料中，CNF具有最高的表面积（183 m2 g-1），最薄的丝尺寸（24 nm）和最高的表面缺陷密度，在效率，开路电位和短路电流密度方面表现出最佳的性能。对电极厚度的进一步研究以及串联和电荷转移电阻交叉分析表明，表面积和表面石墨化对获得合适的性能起着关键作用。与文献相比，获得的CNFs代表了制造低成本DSSC阴极的有趣替代方案。
Carbon materials represent an attractive alternative to platinum in dye-sensitized solar cells (DSSC) counter electrodes to contribute to an efficient conversion of solar energy into electricity. The use of highly graphitic carbon nanofibers (CNFs) is investigated by analyzing the effect of the filament diameter, surface area and graphitization degree on the DSSC cathode performance. To this purpose, transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and physisorption analysis are used to characterize the main properties of the CNFs. The behavior of CNFs as counter electrodes in DSSC is investigated by polarization experiments and electrochemical impedance spectroscopy. Among the different materials, the CNF characterized by the highest surface area (183 m2 g-1), thinnest filament size (24 nm) and highest density of surface defects shows the best performance in terms of efficiency, open circuit potential and short circuit current density. Further investigation of the electrode thickness together with series and charge transfer resistance cross-analysis evidences the key role played by the surface area and surface graphitization to obtain a suitable performance. Compared to literature, so-obtained CNFs represent an interesting alternative to manufacture low cost DSSC cathodes.