NDLI: Optimization of MnO2/CNW composite electrodes for energy storage application

Content Provider	IEEE Xplore Digital Library
Author	Hassan, S. Suzuki, M. Mori, S. El-Moneim, A.A.
Copyright Year	2012
Description	Author affiliation: Energy Resources & Environ. Eng. Dept., Egypt-Japan Univ. of Sci. & Technol., Alexandria, Egypt (Hassan, S.) \|\| Dept. of Chem. Eng., Tokyo Inst. of Technol., Tokyo, Japan (Suzuki, M.; Mori, S.) \|\| Mater. Sci. & Eng. Dept., Egypt-Japan Univ. of Sci. & Technol., Alexandria, Egypt (El-Moneim, A.A.)
Abstract	Nanostructured $MnO_{2}$ thin films were electrodeposited on carbon nanowalls (CNWs), which were grown first by microwave plasma enhanced chemical vapor deposition (MPECVD) on three-dimensional nickel foam substrates. The optimization theme for producing composite $MnO_{2}/CNW$ on large area electrodes for electrochemical supercapacitors is presented. The $MnO_{2}/CNW$ nanocomposite electrodes were characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The control of the growth time of CNW is found to be key point for the optimization of the $MnO_{2}$ electrodeposition process in view to enhance the supercapacitive behavior of $MnO_{2}/CNW$ nanocomposite electrodes. The capacitive behavior and morphology of $MnO_{2}$ were strongly affected by the incorporation of CNWs. The $MnO_{2}/CNW$ nanocomposite electrodes showed better rate capability than $MnO_{2}$ electrode. The $MnO_{2}/CNW$ nanocomposite electrode with CNW deposition time, 18 sec, showed the optimum capacitive behaviour. A specific capacitance of 851 F/g at a current density of 1 $mA/cm^{2},$ equivalent series resistance of 3.19 Ω, and charge transfer resistance of 1.02 Ω are obtained for $MnO_{2}/CNW$ (18 sec) electrode. This electrode also retained a stable capacitance, as its loss is only 8 % over 2000 cycles by charging and discharging at 3 $mA/cm^{2},$ indicative of long term electrochemical cycling stability which suggests its possible choice as a promising electrode for supercapacitors.
Sponsorship	IEEE Robotics Autom. Soc.
Starting Page	46
Ending Page	51
File Size	1112734
Page Count	6
File Format	PDF
ISBN	9781467344401
e-ISBN	9781467344395
DOI	10.1109/ICIES.2012.6530843
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-12-07
Publisher Place	Egypt
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Manganese dioxide Carbon nanowalls Microwave plasma enhanced chemical vapor deposition Supercapacitor Electrodeposition Nickel foam
Content Type	Text
Resource Type	Article

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