期刊
ACS APPLIED MATERIALS & INTERFACES
卷 4, 期 3, 页码 1770-1776出版社
AMER CHEMICAL SOC
DOI: 10.1021/am3000165
关键词
monodisperse MnO2 nanospheres; graphene sheets; nanocomposites; electrostatic interaction; honeycomb-like opened structure; supercapacitors
资金
- National Natural Science Foundation of China [20871118]
- Knowledge Innovation Program of Chinese Academy of Sciences (CAS) [timetinKGCX2-YW-370, KGCX2-EW-304-2]
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry (TIPC), CAS
Graphene-wrapped MnO2 nanocomposites were first fabricated by coassembly between honeycomb MnO2 nanospheres and graphene sheets via electrostatic interaction. The materials were characterized by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, atomic force microscopy, and thermogravimetric analysis. The novel MnO2/graphene hybrid materials were used for investigation of electrochemical capacitive behaviors. The hybrid materials displayed enhanced capacitive performance (210 F/g at 0.5 A/g). Additionally, over 82.4% of the initial capacitance was retained after repeating the cyclic voltammetry test for 1000 cycles. The improved electrochemical performance might be attributed to the combination of the pesudocapacitance of MnO2 nanospheres with the honeycomb-like opened structure and good electrical conductivity of graphene sheets.
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