Asymmetric supercapacitor based on novel coal fly ash derived metal–organic frameworks as positive electrode and its derived carbon as negative electrode

• Published in: Journal of applied electrochemistry 2022-05, Vol.52 (5), p.821-834
• Main Authors: Rambau, Khavharendwe Melba, Tarimo, Delvina Japhet, Fasakin, Oladepo, Musyoka, Nicholas Mulei, Manyala, Ncholu
• Format: Article
• Language: English
• Subjects: Aluminum; Asymmetry; Capacitors; Carbon; Chemistry; Chemistry and Materials Science; Comparative studies; Electrochemical analysis; Electrochemistry; Electrons; Fly ash; Industrial Chemistry/Chemical Engineering; Metal-organic frameworks; Physical Chemistry; Research Article; Supercapacitors
• ISSN: 0021-891X; 1572-8838
• DOI: 10.1007/s10800-022-01672-3

The paper presents a comparative study between aluminum fumarate metal–organic framework (Al-FumMOF) and a novel coal fly ash derived aluminum MOF (CFA-FumMOF) with their respective MOF-derived carbons (MDCs) for electrochemical performance in supercapacitor application. In the half-cell configuration, Al-FumMOF possessed the highest specific capacity value of 28.62 mAh g −1 and CFA-FumMOF with 9.88 mAh g −1 at a specific current of 0.5 A g −1 in 6 M KOH electrolyte. The carbon derivative from CFA-FumMOF possessed the highest specific capacitance of 306.59 F g −1 at 0.5 A g −1 as compared to carbon obtained from Al-FumMOF (111.94 F g −1 ). Each MOF was prepared with its respective carbon derivative for an asymmetrical capacitor device with a specific capacity of 5.09 mAh g −1 at 0.5 A g −1 . Graphical abstract