Cleanly synthesizing rotten potato-based activated carbon for supercapacitor by self-catalytic activation. (10th February 2021)

• Record Type: Journal Article
• Authors: Wang, Ao; Sun, Kang; Xu, Ruting; Sun, Yunjuan; Jiang, Jianchun
• Is Part Of: Journal of cleaner production. Volume 283(2021)
• Publication Date: 2021-02-10
• Subjects: Activated carbon -- Rotten potato waste -- Cleaner production -- Self-catalytic activation -- Supercapacitor; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.125385
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: A novel self-catalytic activation approach is developed for the preparation of hierarchically porous carbon from rotten potato wastes. Metals already existing within the rotten potatoes were used as the catalysts and gases emitted during pyrolysis were used as the activating reagents, leading to the cleaner production of hierarchically porous carbon materials without additional reagents. The as-made activated carbon exhibits high BET surface area of 2201 m 2 g −1, optimal hierarchically porous, and good conductivity of 14.2 S cm −1 . When fabricated into a symmetrical supercapacitor, it displays a relatively high capacitance of 54 F g −1 (29.2 F cm −3 ) at 0.5 A g −1, and excellent cycling reliability of exceeding 100% retention after 5000 cycles in 6M KOH, and an energy density of 20.8 Wh kg −1 (11.2 Wh L −1 ) in 1 M TEABF4 /AN. More importantly, the approach outlined herein also offers a promising strategy for cleaner production of advanced activated carbon derived from other biomass wastes. Graphical abstract: Image 1 Highlights: Rotten potato derived activated carbon were cleanly prepared by self-catalytic activation. Additional activation regent and catalyst are not needed in the novel approach. The prepared AC exhibits capacitance of 220 F g −1 at 0.5 A g −1 and 170 F g −1 at 50 A g −1 . The prepared AC exhibits exceeding 100% capacitance retention after 5000 cycles. This approach can be extended to the other biomass wastes to prepare advanced ACs.