期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 366, 期 1-3, 页码 104-109出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2010.05.031
关键词
Mesocarbon microbead; Manganese dioxide; Surface adsorption; Interfacial area; Supercapacitor
资金
- National Natural Science Foundation of China [20663001, 20763002]
MnO2 nanostructures are successfully coated onto activated mesocarbon microbeads (a-MCMB) by a simple chemical coprecipitation method. The structure and morphology of the as-prepared a-MCMB/MnO2 composite were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the nano-MnO2 is of short fiber-like structures with about 200 nm in length and 60 nm in width. A growing mechanism was also proposed for the nano-MnO2 on the surface of a-MCMB. This novel composite was used as an electrode material for supercapacitors. Electrochemical measurements showed that the composite electrode has a maximum specific capacitance of 183 Fg(-1) in 1 M LiPF6 (EC + DMC) organic electrolyte with an operating voltage up to 3.0 V. The specific capacitance base on the MnO2 is estimated to be as high as 475 Fg(-1), corresponding to a considerable energy density of 106 wh kg(-1). (C) 2010 Elsevier B.V. All rights reserved.
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