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Journal of Nanomaterials
Volume 2015, Article ID 609273, 12 pages
http://dx.doi.org/10.1155/2015/609273
Research Article

Nanoflake Manganese Oxide and Nickel-Manganese Oxide Synthesized by Electrodeposition for Electrochemical Capacitor

1Department of Physical Chemistry, Faculty of Chemistry, University of Science, VNUHCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 70000, Vietnam
2Applied Physical Chemistry Laboratory, Faculty of Chemistry, University of Science, VNUHCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 70000, Vietnam

Received 15 January 2015; Accepted 24 March 2015

Academic Editor: Jumi Yun

Copyright © 2015 Man Van Tran et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanoflake structures of electrochemical manganese oxide (EMD) and nickel mixed manganese oxide (NiMD) were directly deposited on a stainless steel by using Chronoamperometry and Cyclic Voltammetry (CV) techniques. The structure, morphology, and capacitive behavior of EMD or NIMD nanoflake were affected by the electrodeposition modes and deposition time. The highest specific capacitance () was obtained for only two-minute deposition by both methods. EMD nanoflakes electrodeposited by CV technique show higher specific capacitance values than those prepared by Chronoamperometry owing to its homogenous and highly porous surface. All EMD samples exhibited excellent cycle behavior, less than 5% capacitance loss after 1000 cycles. Ni mixed MnO2 was prepared at different Mn2+/Ni2+ ratios for 2 minutes of electrodeposition. The presence of Ni2+ ion enhanced the value at high charge-discharge rate due to the decrease of the charge transfer resistance. The supercapacitor prototype of 2 cm × 2 cm was assembled using EMD and NiMD as electrode material and tested at 1 A·g−1.