Browsing by Author "Hung, Jeng Han"

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Electrophoretic Fabrication and Characterizations of Manganese Oxide/Carbon Nanotube Nanocomposite Pseudocapacitors
(2011)
Hung, Chung Jung
;
Hung, Jeng Han
;
Lin, Pang
;
Tseng, Tseung Yuen
;
材料科學與工程學系
This study reports the electrochemical performance and stability of MnO(x)-multiwall carbon nanotubes (MWCNTs) nanocomposite/Ni pseudocapacitor electrodes fabricated by a modified electrophoretic deposition (EPD) method. The nanocomposite electrode consisting of highly dispersed manganese oxide on MWCNTs was synthesized by a redox titration method at room temperature. The electrochemical properties of the electrode were demonstrated by cyclic voltammetry. The mean specific capacitances at a constant scan rate of 100 mV/s of MnO(x)-MWCNTs nanocomposites without and with heat treatment at temperatures 150, 200, and 250 degrees C for 2 h are 378, 402, 445, and 469 F/g, respectively, which indicate an increase with increasing annealing temperature. During stability tests, the as-grown MnO(x)-MWCNTs nanocomposite electrode can preserve 80% of its original capacitance after 6000 cycles of operation which can be increased to 86% after annealing at 200 degrees C for 2 h. The EPD MnO(x)/MWCNTs coaxial nanocomposite pseudocapacitors with manganese oxide ionized by H(+) ion process exhibit high specific capacitance, fast reaction rate, high stability, and have high potential for practical applications. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3601862] All rights reserved.