Fe/Cu修饰氮掺杂碳纳米管的构筑及催化性能

通过简单的原位化学合成法结合离子交换法制备了Cu修饰氮掺杂碳（Cu-N-C）和Fe/Cu修饰氮掺杂碳纳米管（Fe/Cu-N-C/CNT），并系统评估了2种催化剂作为染料敏化太阳能电池（dye-sensitized solar cells，DSSCs）对电极在I₃^-/I^-体系中的电化学特性和光伏性能。采用X射线衍射（XRD）、拉曼（Raman）、X射线光电子能谱（XPS）和场发射扫描电镜（FESEM）对合成的催化剂进行组分和形貌表征。结果表明：纳米管状的Fe/Cu-N-C/CNT的石墨化程度比纳米颗粒状的Cu-N-C更高，更有利于I₃^-还原反应中电荷的传输。光伏性能测试结果表明：基于Fe/Cu-N-C/CNT对电极的DSSCs的光电能量转换效率（power conversion efficiency，PCE）达到7.55%，高于相同测试条件下Cu-N-C（6.99%）和Pt（6.76%）对电极的PCE。50圈连续循环伏安测试结果表明：Fe/Cu-N-C/CNT催化剂具有比Cu-N-C更好的电化学稳定性。

Construction and Catalytic Properties of Fe/Cu Modified Nitrogen-Doped Carbon with Carbon Nanotube

Cu-modified nitrogen-doped carbon (Cu-N-C) and Fe/Cu-modified nitrogen-doped carbon with carbon nanotube (Fe/Cu-N-C/CNT) catalysts were prepared by in situ chemical synthesis combined with an ion exchange method. As counter electrode in dye-sensitized solar cells (DSSCs), the electrochemical properties and photovoltaic performance of these two catalysts in I₃^-/I^- electrolyte were explored. The structure and morphology of as-prepared catalysts were characterized by X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectra (XPS), and field emission scanning electron microscope (FESEM). The results showed that the graphitization degree of Fe/Cu-N-C/CNT was higher than that of Cu-N-C, which is more favorable for charge transfer during I₃^- reduction process. The photovoltaic tests results showed that the DSSCs based on Fe/Cu-N-C/CNT CE achieved a power conversion efficiency (PCE) of 7.55%, higher than Cu-N-C (6.99%) and Pt (6.76%) under the same conditions. 50 cycles continuous cyclic voltammetry scanning showed that Fe/Cu-N-C/CNT had better electrochemical stability than Cu-N-C. This robust behavior can be mainly attributed to the synergistic effect between the bimetallic active sites (Fe/Cu) and the nitrogen-doped carbon network with CNTs, which results in a pronounced decrease in the charge-transfer resistance and superior device stability.