Seed-assisted synthesis of hierarchical manganese dioxide/carbonaceous sphere composites with enhanced supercapacitor performance. (20th October 2015)

• Record Type: Journal Article
• Authors: Nie, Guangdi; Lu, Xiaofeng; Lei, Junyu; Wang, Ce
• Is Part Of: Electrochimica acta. Volume 180(2015)
• Page Start: 1033
• Page End: 1040
• Publication Date: 2015-10-20
• Subjects: Manganese dioxide -- Carbonaceous spheres -- Hierarchical nanostructures -- Supercapacitor; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.09.014
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Hierarchical MnO2 nanosheets/carbonaceous sphere composites (CMnO2 -2) exhibited excellent electrochemical performance with larger specific capacitance, higher rate capability and better cycling stability than MnO2 nanoparticles-coated carbonaceous spheres (CMnO2 -1). Highlights: Carbonaceous spheres covered with MnO2 nanoparticles or nanosheets were prepared. A facile in situ seed-assisted method was developed. The synthetic approach could accomplish the controlled fabrication of composites. The MnO2 /carbonaceous composites exhibited excellent supercapacitor performance. Abstract: Uniform carbonaceous spheres covered with MnO2 nanoparticles (CMnO2 -1) or nanosheets (CMnO2 -2) were successfully prepared via a facile in situ seed-assisted method which could accomplish the controlled fabrication of the composites with tunable morphology and mass loading of MnO2 . When employed as active materials for supercapacitor electrodes, CMnO2 -2 exhibited larger specific capacitance, higher rate capability and better cycling stability than CMnO2 -1 due to the fast ion penetration and smaller charge-transfer resistance. It is believed that these results may provide an alternative way to improve the redox kinetics and reversibility of metal oxides-based pseudocapacitors.