Capacitive properties of hierarchically structured carbon nanofiber/graphene/MnO2 hybrid electrode with nitrogen and oxygen heteroatoms. (October 2016)

• Record Type: Journal Article
• Authors: Lee, Do Geum; Kim, Yoong Ahm; Kim, Bo-Hye
• Is Part Of: Carbon. Volume 107(2016)
• Page Start: 783
• Page End: 791
• Publication Date: 2016-10
• Subjects: MnO2 -- Heteroatoms -- Poly(methyl methacrylate) -- Carbonization temperature -- Electrochemical supercapacitor; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2016.06.093
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Hierarchically structured carbon nanofiber/graphene/MnO2 (CGMn) hybrid with oxygen and nitrogen functionalities was fabricated in the form of a web via electrospinning as an electrode material for supercapacitors. The CGMn electrode exhibited a high capacitance (225 Fg −1 at 1 mAcm −2 ), enhanced energy and power efficiency (15.8–13.6 Whkg −1 in the power density range of 197–4000 Wkg −1 ), and excellent capacitance retention (13% of the initial value at a discharge current of 20 mAcm −2 ) in a 6 M KOH aqueous electrolyte, because of the combination of the double-layer capacitance and the pseudocapacitive character associated with the surface redox-type reactions. The porosity and the number of heteroatoms of the CGMn composite were adjusted by changing the PMMA concentration and carbonization temperature. Therefore, the oxygen- and nitrogen-containing hierarchical porous CGMn hybrid prepared by a simple method is a promising candidate as an electrode material for supercapacitors.