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Preparation and Enhanced Electrochemical Performance of MnO 2 Nanosheets for Supercapacitors
Author(s) -
Mondal Anjon Kumar,
Wang Bei,
Su Dawei,
Wang Ying,
Zhang Xiaogang,
Wang Guoxiu
Publication year - 2012
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201200237
Subject(s) - supercapacitor , nanosheet , chemistry , cyclic voltammetry , potassium permanganate , tetrahydrate , electrochemistry , pseudocapacitor , transmission electron microscopy , chemical engineering , microstructure , manganese , scanning electron microscope , electrode , electrolyte , capacitance , inorganic chemistry , materials science , composite material , crystal structure , crystallography , organic chemistry , engineering
MnO 2 nanosheets have been synthesized by using a redox reaction of manganese nitrate tetrahydrate and potassium permanganate without any surfactants. The morphology and microstructure of the as‐prepared material were characterized by field emission scanning electron microscopy, transmission electron microscopy and X‐ray diffraction (XRD). Electrochemical performances as electrode materials for supercapacitor were evaluated using cyclic voltammetry and galvanostatic charge‐discharge in 1 M Na 2 SO 4 aqueous electrolyte. It was found that MnO 2 nanosheets showed an excellent capacitive behaviour with good cycling stability. The specific capacitance of the MnO 2 nanosheet electrode can reach up to 332.8 Fg −1 at a current density of 500 mA/g and a stable cycling performance.