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Title: Ultrathin MnO2 nanofibers grown on graphitic carbon spheres as high-performance asymmetric supercapacitor electrodes
Authors: Lei, Z. 
Zhang, J.
Zhao, X.S. 
Issue Date: 7-Jan-2012
Source: Lei, Z., Zhang, J., Zhao, X.S. (2012-01-07). Ultrathin MnO2 nanofibers grown on graphitic carbon spheres as high-performance asymmetric supercapacitor electrodes. Journal of Materials Chemistry 22 (1) : 153-160. ScholarBank@NUS Repository.
Abstract: Growing MnO2 nanofibers on graphitic hollow carbon spheres (GHCS) is conducted by refluxing GHCS in a KMnO4 aqueous solution aimed to enhance the electrochemically active surface area of MnO2. The stoichiometric redox reaction between GHCS and MnO4 - yields GHCS-MnO2 composites with controllable MnO2 content. It is found that these ultrathin MnO2 nanofibers are vertically grown on the external surface of the GHCS, yielding a composite electrode showing good electron transport, rapid ion penetration, fast and reversible Faradic reaction, and excellent rate performance when used as supercapacitor electrode materials. An asymmetric supercapacitor cell with GHCS-MnO2 as the positive electrode and GHCS as the negative electrode can be reversibly charged/discharged at a cell voltage of 2.0 V in a 1.0 mol L-1 Na2SO4 aqueous electrolyte, delivering an energy density of 22.1 Wh kg-1 and a power density of 7.0 kW kg-1. The asymmetric supercapacitor exhibits an excellent electrochemical cycling stability with 99% initial capacitance and 90% coulombic efficiency remained after 1000 continuous cycles measured using the galvanostatic charge-discharge technique.
Source Title: Journal of Materials Chemistry
ISSN: 09599428
DOI: 10.1039/c1jm13872c
Appears in Collections:Staff Publications

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