Ultra-small Fe3O4 nanoparticles encapsulated in hollow porous carbon nanocapsules for high performance supercapacitors. (July 2021)

• Record Type: Journal Article
• Authors: Wang, Lijian; Liu, Fenghua; Pal, Avishek; Ning, Yuesheng; Wang, Zan; Zhao, Binyuan; Bradley, Robert; Wu, Weiping
• Is Part Of: Carbon. Volume 179(2021)
• Page Start: 327
• Page End: 336
• Publication Date: 2021-07
• Subjects: Supercapacitors -- Porous carbon nanocapsules -- Incipient wetness impregnation -- Gravimetric capacitance -- Volumetric capacitance; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.04.024
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: A new nanoscale architecture of Fe3 O4 -carbon hybrid materials was developed by a vacuum incipient wetness procedure. The amount of Fe3 O4 nanoparticles were controllably confined inside the cavity of the bowl-shaped hollow porous carbon nanocapsules (CNB). TEM images and TG curves proved that different loading of Fe3 O4 small nanoparticles (NPs) with a diameter less than 50 nm were stored in CNB. Benefiting from the synergistic effect of the appropriate amount of uniformly dispersed Fe3 O4 NPs and bowl-shaped carbon nano-capsules with high specific surface area, high conductivity and high amount of Nitrogen (N) and oxygen (O) elemental doping of Fe3 O4 @CNB, the new architecture provides good reversibility for the transport of electrolyte ions. When tested in supercapacitor devices, Fe3 O4 @CNB-2 (containing 40.3 wt% Fe3 O4 ) exhibited the highest gravimetric (466 F g −1 ) and volumetric capacitance (624 F cm −3 ). The supercapacitors based on these materials also showed excellent cycling stability (92.4% capacitance retention after 5000 cycles). This class of Fe3 O4 -carbon hybrid materials has excellent electrochemical properties, and its synthesis strategy can be extended to construct other hybrid materials for various applications, such as biomedicine, catalysis, energy harvest, energy storage and so on. Graphical abstract: Image 1