Synthesis and performance evaluation of supercapacitor based on banana peel–derived biochar loaded manganese dioxide with polyaniline ternary composite

• Published in: Ionics 2024-08, Vol.30 (8), p.4967-4980
• Main Authors: Hamadi, Fatima Zohra, Ezzat, Abdelrahman Osama, Abd-Elkader, Omar H., Benyoucef, Abdelghani, Alkoudsi, B. Dhygham, Sabantina, Lilia
• Format: Article
• Language: English
• Subjects: Aniline; Capacitance; Charge materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrochemistry; Electrode materials; Electrodes; Energy Storage; Manganese dioxide; Optical and Electronic Materials; Performance evaluation; Polyanilines; Renewable and Green Energy; Specific energy; Supercapacitors
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-024-05622-1

The properties of banana peel (BP)–derived biochar were altered by introducing MnO 2 using precipitation method. The resulting MnO 2 –BP composite was modified by in situ polymerization of aniline monomer in the composite matrix, and obtained the MnO 2 –BP@PAni electrode. After performing the physicochemical studies using XRD, XPS, FT-IR, TGA, UV–Vis, and BET analyses, the electrode materials were subjected to cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The MnO 2 –BP@PAni electrode exhibited specific capacitance as high as 512.8 F g −1 , improved capacitance retention of 86.89% after 10,000 cycles at a current density of 1.0 A g −1 , and a lower resistance of 1.28 Ω resulting from the dense growth of PAni backbone on the surface of the MnO 2 –BP owing to electrostatic interaction. Moreover, the electrode shows a specific energy of 23.4 Wh·kg −1 at a specific power of 306.9 W·kg −1 . These results demonstrate that MnO 2 –BP@PAni has admirable electrochemical properties and can be regarded as a promising electrode for SCs. Graphical Abstract