Usman Muhammad, Adnan Muhammad, Ahsan Muhammad Tayyab, Javed Sofia, Butt Muhammad Shoaib, Akram M Aftab
School of Chemical and Materials Engineering, National University of Sciences and Technology (NUST), Sector H-12, Islamabad 44000, Pakistan.
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
ACS Omega. 2021 Jan 7;6(2):1190-1196. doi: 10.1021/acsomega.0c04306. eCollection 2021 Jan 19.
Conductive polymers have become a remarkable candidate for electrode materials of supercapacitors. Polyaniline (PANI) is the most promising contender for supercapacitors because of its easy method of synthesis, low cost, and higher choice in the improvement of energy storage applications. The main issue in the use of PANI in supercapacitors is its lower stability. In this work, PANI@Fe-Ni codoped CoO (PANI@FNCO) nanocomposite has been prepared by in situ addition of 10 wt % FNCO as fillers in the PANI matrix. The nanocomposites were then characterized via scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry to observe the morphology, crystal structure, functional groups, and thermal stability of samples, respectively. SEM results showed that FNCO was fairly dispersed in the PANI matrix, while XRD results showed a broad peak for nanocomposites because of the semicrystalline nature of polymers. The electrochemical properties of the samples were analyzed via cyclic voltammetry, galvanostatic charge and discharge, and electrochemical impedance spectroscopy. PANI@FNCO nanowires are found to overcome the shortcomings in electrochemical energy storage devices by exhibiting a higher value of specific capacitance of 1171 F g and energy density of 144 W h kg at a current density of 1 A g. Moreover, the FNCO nanowires also showed a cyclic charge/discharge stability of 84% for 2000 cycles.
导电聚合物已成为超级电容器电极材料的一个显著候选者。聚苯胺（PANI）因其合成方法简便、成本低以及在储能应用改进方面有更多选择，是超级电容器最有前景的竞争者。在超级电容器中使用聚苯胺的主要问题是其稳定性较低。在这项工作中，通过在聚苯胺基质中原位添加10 wt%的FNCO作为填料制备了聚苯胺@铁镍共掺杂氧化钴（PANI@FNCO）纳米复合材料。然后通过扫描电子显微镜（SEM）、X射线衍射（XRD）、傅里叶变换红外光谱、热重分析和差示扫描量热法对纳米复合材料进行表征，分别观察样品的形态、晶体结构、官能团和热稳定性。SEM结果表明FNCO在聚苯胺基质中分散良好，而XRD结果显示由于聚合物的半结晶性质，纳米复合材料出现宽峰。通过循环伏安法、恒电流充放电和电化学阻抗谱分析样品的电化学性能。发现PANI@FNCO纳米线在1 A g的电流密度下表现出1171 F g的较高比电容和144 W h kg的能量密度，克服了电化学储能器件中的缺点。此外，FNCO纳米线在2000次循环中还表现出84%的循环充放电稳定性。
