Center for Advanced Photovoltaics, Department of Electrical Engineering, South Dakota State University, 020 EECS, Brookings, South Dakota 57007, USA.
ACS Appl Mater Interfaces. 2010 Dec;2(12):3572-7. doi: 10.1021/am100742s. Epub 2010 Nov 12.
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 (Rct), large capacitance (C), and fast reaction rates for triiodide reduction. Although the efficiency (η) of ECN-based cells was slightly lower than that of Pt-based cells, their short circuit current density (Jsc) and open circuit voltage (Voc) were comparable. The ECN-based cells achieved an energy conversion efficiency (η) 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 (RStot) at ∼15.5 Ω cm2, which was larger than that of ∼4.8 Ω cm2 in the Pt-based devices. Simulated results showed that the fill factor (FF) and η could be substantially improved by decreasing RStot, which might be achieved by using thinner and highly porous ECNs to reduce the thickness of the ECNs counter electrode.
电纺碳纳米纤维（ECNs）已被探索作为一种电催化剂，并作为低成本替代物来替代铂（Pt），用于染料敏化太阳能电池（DSCs）中的三碘化物还原。电化学阻抗谱（EIS）和循环伏安法测量的结果表明，ECN 对电极具有低电荷转移电阻（Rct）、大电容（C）和快速的三碘化物还原反应速率。尽管基于 ECN 的电池的效率（η）略低于基于 Pt 的电池，但它们的短路电流密度（Jsc）和开路电压（Voc）相当。在 AM 1.5 光照下，基于 ECN 的电池在 100 mW cm(-2) 的光强下实现了 5.5%的能量转换效率（η）。使用 ECN 电极的电池性能较低的原因可能是其填充因子（FF）低于基于 Pt 的电池，这可能是由于总串联电阻（RStot）较大，约为 15.5 Ω cm2，而基于 Pt 的器件中的 RStot 约为 4.8 Ω cm2。模拟结果表明，通过降低 RStot，可以显著提高填充因子（FF）和 η，这可以通过使用更薄且高度多孔的 ECN 来降低 ECN 对电极的厚度来实现。
