Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/27685
Title: Enhancement of electrochemical capacitive properties based on complementation of morphologies
Authors: Cao, F
Liu, Y
Chen, B
Fei, L
Wang, Y 
Yuan, J 
Keywords: Complementation of morphology
Electrochemical capacitive properties
Nanocomposites
The optimized ratio
Issue Date: 2012
Publisher: Pergamon-Elsevier Science Ltd
Source: Electrochimica acta, 2012, v. 81, p. 1-7 How to cite?
Journal: Electrochimica Acta 
Abstract: Manganese dioxides octahedral molecular sieve nanowires with 2 × 2 tunnels (designated OMS-2) and amorphous manganese dioxides were synthesized via a hydrothermal treatment and a sol-gel method, respectively. Amorphous MnO 2 nanoparticles were incorporated into the matrix of OMS-2 nanowires to form homogenous nanocomposites. The structures and morphologies of as-synthesized OMS-2 nanowires and amorphous MnO 2 nanoparticles were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). Electrochemical behaviors of the as-prepared nanocomposites with varying ratios were investigated by cyclic voltammetry (CV), galvanostatic charge/discharge and potentiostatic electrochemical impedance spectroscopy (EIS) using a three-electrode system in a 0.5 M Na 2SO 4 aqueous solution. Pure OMS nanowires exhibit a specific capacitance of about 37 F g -1, and amorphous MnO 2 nanoparticles demonstrate relatively higher specific capacitance of about 106 F g -1 at a scan rate of 2 mV s -1. The enhancement of specific capacitance can be carried out by mixing OMS-2 nanowires and amorphous MnO 2 nanoparticles to form nanocomposites and the optimized mole ratio of OMS-2 nanowires to amorphous MnO 2 as 1:5 can be achieved. The improved specific capacitance can be attributed to the increase of electrode conductivity and the effective interfaces between MnO 2 active materials and electrolyte.
URI: http://hdl.handle.net/10397/27685
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2012.05.140
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