Oyedotun Kabir O, Makgopa Katlego, Nkambule Thabo T, Mathe Mkhulu K, Otun Kabir O, Mamba Bhekie B
College of Science, Engineering and Technology, University of South Africa, Florida Science Campus, Private Bag X6, Johannesburg 1709, South Africa.
Department of Chemistry, Faculty of Science, Tshwane University of Technology, Arcadia Campus, Pretoria 0001, South Africa.
Polymers (Basel). 2024 Jun 28;16(13):1859. doi: 10.3390/polym16131859.
A facile interconnected nanofibre electrode material derived from polybenzimidazol (PBI) was fabricated for a supercapacitor using a centrifugal spinning technique. The PBI solution in a mixture of dimethyl acetamide (DMA) and N, N-dimethylformamide (DMF) was electrospun to an interconnection of fine nanofibres. The as-prepared material was characterised by using various techniques, which include scanning electron microscopy (SEM), X-ray diffractometry (XRD), Raman, X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) among others. The specific surface area of the interconnected NCF material was noticed to be around 49 m g. Electrochemical properties of the material prepared as a single-electrode are methodically studied by adopting cyclic voltammetry, electrochemical impedance spectroscopy, and constant-current charge-discharge techniques. A maximum specific capacitance of 78.4 F g was observed for the electrode at a specific current of 0.5 A g in a 2.5 M KNO solution. The electrode could also retain 96.7% of its initial capacitance after a 5000 charge-discharge cycles at 5 A g. The observed capacitance and good cycling stability of the electrode are supported by its specific surface area, pore volume, and conductivity. The results obtained for this material indicate its potential as suitable candidate electrode for supercapacitor application.
采用离心纺丝技术制备了一种由聚苯并咪唑（PBI）衍生的简易互连纳米纤维电极材料用于超级电容器。将PBI溶解在二甲基乙酰胺（DMA）和N，N-二甲基甲酰胺（DMF）的混合溶液中进行静电纺丝，得到精细纳米纤维的互连结构。通过扫描电子显微镜（SEM）、X射线衍射仪（XRD）、拉曼光谱、X射线光电子能谱（XPS）以及布鲁诺尔-埃米特-泰勒（BET）等多种技术对所制备的材料进行了表征。互连的NCF材料的比表面积约为49 m²/g。采用循环伏安法、电化学阻抗谱和恒流充放电技术对作为单电极制备的材料的电化学性能进行了系统研究。在2.5 M KNO₃溶液中，当特定电流为0.5 A/g时，电极的最大比电容为78.4 F/g。在5 A/g的电流下进行5000次充放电循环后，该电极仍能保持其初始电容的96.7%。电极所观察到的电容和良好的循环稳定性由其比表面积、孔体积和电导率所支撑。该材料所获得的结果表明其作为超级电容器应用的合适候选电极的潜力。
